Updated on 2026/03/10

写真a

 
NISHIHARA HIROSHI
 
Organization
Institute of Integrated Research Atomhybrid Materials Research Unit Visiting Professor
Title
Visiting Professor
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Degree

  • (BLANK)

Research Areas

  • Nanotechnology/Materials / Inorganic/coordination chemistry

  • Nanotechnology/Materials / Functional solid state chemistry

Education

  • The University of Tokyo   Graduate School, Division of Science   Department of Chemistry

    - 1982

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    Country: Japan

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  • The University of Tokyo   Graduate School, Division of Science

    - 1982

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  • The University of Tokyo

    - 1982

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    Country: Japan

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  • The University of Tokyo   Faculty of Science   Department of Chemistry

    - 1977

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    Country: Japan

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  • The University of Tokyo   Faculty of Science

    - 1977

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Research History

  • Tokyo University of Science   Organization for Research Advancement, Research Institute for Science and Technology   Professor   Emeritus Professor, The University of Tokyo

    2020.4

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  • Institute for Molecular Science

    2010.4

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  • Nagoya University   Research Center for Materials Science

    2010.4

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  • 日本学術振興会学術システム研究センター   専門研究員

    2010.4

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  • University of Strasbourg

    2009.4 - 2009.5

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  • The University of Tokyo   Graduate School of Science

    2009.4

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  • University of Bordeaux I

    2005.4 - 2005.5

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  • 東京大学大学院理学系研究科 教授

    1996.9 - 2020.3

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  • 新技術事業団(科学技術振興事業団)PREST 研究員

    1993 - 1996

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  • 慶応義塾大学理工学部 助教授

    1992 - 1996

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  • 慶応義塾大学理工学部 専任講師

    1990 - 1992

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  • 米国ノースカロライナ大学チャペルヒル校   客員研究員

    1987.9 - 1989.3

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  • 慶応義塾大学理工学部 助手

    1982 - 1990

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Professional Memberships

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Committee Memberships

  • International Society of Electrochemistry   Vice President  

    2011.1   

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    Committee type:Academic society

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  • 日本化学連合   理事、企画委員長  

    2010.4   

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    Committee type:Academic society

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  • 電気化学会   副会長  

    2010.3   

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    Committee type:Academic society

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  • 日本化学会   化学と教育誌編集委員長  

    2009.2 - 2011.2   

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    Committee type:Academic society

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  • 錯体化学会   副会長  

    2007.9 - 2008.9   

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    Committee type:Academic society

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  • 高分子学会   高分子錯体研究会運営委員長  

    2004.4 - 2006.3   

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    Committee type:Academic society

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  • 電気化学会   庶務理事  

    2004.2 - 2006.2   

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    Committee type:Academic society

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  • 日本化学会   理事  

    2004.2 - 2006.2   

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    Committee type:Academic society

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  • 錯体化学研究会   運営委員  

    2000 - 2002   

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    Committee type:Academic society

    錯体化学研究会

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  • アメリカ電気化学会   The Ways and Means Committeeメンバー  

    2000 - 2002   

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    Committee type:Academic society

    アメリカ電気化学会

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  • 日本化学会   化学教育協議会化学普及小委員会委員長  

    2000 - 2001   

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    Committee type:Academic society

    日本化学会

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Papers

  • Defect-tolerant electron and defect-sensitive phonon transport in quasi-2D conjugated coordination polymers Reviewed

    Hio-Ieng Un, Kamil Iwanowski, Jordi Ferrer Orri, Ian E. Jacobs, Naoya Fukui, David Cornil, David Beljonne, Michele Simoncelli, Hiroshi Nishihara, Henning Sirringhaus

    Nature Communications   16   6628   2025.7

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    Language:English  

    DOI: 10.1038/s41467-025-61920-w

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  • Charge Transport and Carrier Polarity Tuning by Electrolyte Gating in Nickel Benzenehexathiol Coordination Nanosheets Reviewed

    Tian Wu, Xinglong Ren, Zhengkang Qu, Ian E. Jacobs, Lu Zhang, Naoya Fukui, Xin Chen, Hiroshi Nishihara, Henning Sirringhaus

    ADVANCED MATERIALS   37 ( 32 )   2500164   2025.6

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    Language:English  

    DOI: 10.1002/adma.202500164

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  • One-dimensional Bis(dipyrrinato)zinc(II)-linked Porphyrinatozinc(II) Polymer: Synthesis, Exfoliation into Single Wires, and Photofunctionality Reviewed

    Suzaliza Mustafar, Rio Shoji, Ryojun Toyoda, Hiroaki Maeda, Yasuyo Ogino, Hiroshi Nishihara, Ryota Sakamoto

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   98 ( 6 )   uoaf050   2025.6

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    Language:English  

    DOI: 10.1093/bulcsj/uoaf050

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  • Interfacial Synthesis of an Electro-functional 2D Bis(terpyridine)copper(II) Polymer Nanosheet Reviewed

    Kenji Takada, Joe Komeda, Hiroaki Maeda, Naoya Fukui, Hiroyasu Masunaga, Sono Sasaki, Hiroshi Nishihara

    MOLECULES   30 ( 9 )   2044   2025.5

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    Language:English  

    DOI: 10.3390/molecules30092044

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  • Rationally Engineered Heterometallic Metalladithiolene Coordination Nanosheets with Defined Atomic Arrangements Reviewed

    Miyu Ito, Naoya Fukui, Kenji Takada, Ziheng Yu, Hiroaki Maeda, Katsuya Mizuno, Hiroshi Nishihara

    Small   in press   2025.5

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    DOI: 10.1002/smll.202503227

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  • Revealing the charge transport physics in metallic coordination nanosheets by thermoelectric and magnetotransport measurements Reviewed

    Tian Wu, Xinglong Ren, David Cornil, Claudio Quarti, Ian E. Jacobs, Lu Zhang, Naoya Fukui, David Beljonne, Hiroshi Nishihara, Henning Sirringhaus

    Science Advances   11   eadt9196   2025.4

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    DOI: 10.1126/sciadv.adt9196

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  • Coordination Nanosheets Stabilizing Efficient Tin-Based Perovskite Solar Cells Reviewed

    Dhruba B. Khadka, Yan-Chen Kuo, Yi Zhen Li, Muhammad Waqas, You-Jia Xu, Masatoshi Yanagida, Hiroshi Nishihara, Kazuhito Tsukagoshi, Mitch M. C. Chou, Yasuhiro Shirai, Ying-Chiao Wang

    ACS Applied Materials & Interfaces   17 ( 18 )   26813 - 26822   2025.4

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    DOI: 10.1021/acsami.5c05011

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  • Electrically Conductive Multivariate Coordination Nanosheets Reviewed

    Kenji Takada, Hiroaki Maeda, Naoya Fukui, Hiroshi Nishihara

    COORDINATION CHEMISTRY RESEARCH   1   100006   2025.3

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    DOI: 10.1016/j.cocr.2025.100006

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  • Discrete coordination nanochains based on photoluminescent dyes reveal intrachain exciton migration dynamics Reviewed

    Ryojun Toyoda, Naoya Fukui, Haru Taniguchi, Hiroki Uratani, Joe Komeda, Yuta Chiba, Hikaru Takaya, Hiroshi Nishihara, Ryota Sakamoto

    Nature Communications   16 ( 1 )   1367   2025.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1038/s41467-025-56381-0

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    Other Link: https://www.nature.com/articles/s41467-025-56381-0

  • Synthesis of bis(diimino)palladium nanosheets as highly active electrocatalysts for hydrogen evolution Reviewed

    Hiroaki Maeda, Eunice Jia Han Phua, Yuta Sudo, Sayoko Nagashima, Wentai Chen, Mayumi Fujino, Kenji Takada, Naoya Fukui, Hiroyasu Masunaga, Sono Sasaki, Kazuhito Tsukagoshi, Hiroshi Nishihara

    Chemistry – A European Journal   2024.11

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    <jats:p>Development of efficient electrocatalysts for hydrogen evolution reactions (HERs) is necessary to achieve environmentally friendly and sustainable hydrogen production. To reduce cost and to circumvent the scarcity of platinum, the most efficient catalyst for HER, it is essential to develop catalysts using ubiquitous base metals or minimal amounts of precious noble metals. Bis(diimino)metal (MDI) coordination nanosheets are potential HER catalysts because their electric conductivities, two‐dimensionality, and porous structures provide large surface areas and efficient mass and electron transfer. In addition, with sparse metal arrangements in their chemical structures, nanosheets can reduce the amount of metal needed. We synthesized bis(diimino)palladium coordination nanosheets (PdDI) as a coordination polymer composed of bis(diimino)palladium, with semiconducting characteristics, using gas‐liquid interfacial synthesis and electrochemical oxidation. These electrochemically synthesized PdDIs exhibit remarkable catalytic performance with overpotential reaching 10 mA cm−2 of 34 mV, a Tafel slope of 47 mV dec−1, and an exchange current density of 2.1 mA cm−2 after appropriate activation. This performance is closely comparable to that of metallic platinum. An ex‐situ investigation of the activation process revealed that reduction of the divalent Pd center in bis(diimino)palladium produced a composite of Pd(0) species and PdDI, combining high catalytic activity with smooth electron transfer.</jats:p>

    DOI: 10.1002/chem.202403082

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  • Modulation between capacitor and conductor for a redox-active 2D bis(terpyridine)cobalt(II) nanosheet via anion-exchange Reviewed

    Kenji Takada, Miyu Ito, Naoya Fukui, Hiroshi Nishihara

    Communications Chemistry   7   186   2024.8

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    DOI: 10.1038/s42004-024-01274-4

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  • Bis(diimino)nickel Coordination Nanosheets Modified with Triptycene Moieties for Facile Exfoliation and Enhanced Hydrogen Evolution Catalytic Activity

    Hiroaki Maeda, Yuta Sudo, Sayoko Nagashima, Kenji Takada, Naoya Fukui, Hiroyasu Masunaga, Sono Sasaki, Hiroshi Nishihara

    ACS Applied Nano Materials   7 ( 11 )   13775 - 13784   2024.6

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    DOI: 10.1021/acsanm.4c02625

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  • Spontaneous‐Spin‐Polarized 2D π‐d Conjugated Frameworks Towards Enhanced Oxygen Evolution Kinetics Reviewed

    Won Seok Lee, Hiroaki Maeda, Yen‐Ting Kuo, Koki Muraoka, Naoya Fukui, Kenji Takada, Sono Sasaki, Hiroyasu Masunaga, Akira Nakayama, Hong‐Kang Tian, Hiroshi Nishihara, Ken Sakaushi

    Small   20   2401987   2024.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    Abstract

    Alternative strategies to design sustainable‐element‐based electrocatalysts enhancing oxygen evolution reaction (OER) kinetics are demanded to develop affordable yet high‐performance water‐electrolyzers for green hydrogen production. Here, it is demonstrated that the spontaneous‐spin‐polarized 2D π‐d conjugated framework comprising abundant elements of nickel and iron with a ratio of Ni:Fe = 1:4 with benzenehexathiol linker (BHT) can improve OER kinetics by its unique electronic property. Among the bimetallic NiFex:y‐BHTs with various ratios with Ni:Fe = x:y, the NiFe1:4‐BHT exhibits the highest OER activity. The NiFe1:4‐BHT shows a specific current density of 140 A g−1 at the overpotential of 350 mV. This performance is one of the best activities among state‐of‐the‐art non‐precious OER electrocatalysts and even comparable to that of the platinum‐group‐metals of RuO2 and IrO2. The density functional theory calculations uncover that introducing Ni into the homometallic Fe‐BHT (e.g., Ni:Fe = 0:1) can emerge a spontaneous‐spin‐polarized state. Thus, this material can achieve improved OER kinetics with spin‐polarization which previously required external magnetic fields. This work shows that a rational design of 2D π‐d conjugated frameworks can be a powerful strategy to synthesize promising electrocatalysts with abundant elements for a wide spectrum of next‐generation energy devices.

    DOI: 10.1002/smll.202401987

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  • Face-on-oriented formation of bis(diimino)metal coordination nanosheets on gold electrodes byelectrochemical oxidation Reviewed

    Hiroaki Maeda, Kenji Takada, Naoya Fukui, Hiroyasu Masunaga, Sono Sasaki, Kazuhito Tsukagoshi, Hiroshi Nishihara

    NEW JOURNAL OF CHEMISTRY   48   6081 - 6087   2024.3

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    DOI: 10.1039/d3nj05650c

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  • Lateral heterometal junction rectifier fabricated by sequential transmetallation of coordination nanosheet Reviewed

    Choon Meng Tan, Naoya Fukui, Kenji Takada, Hiroaki Maeda, Ekaterina Selezneva, Cédric Bourgès, Hiroyasu Masunaga, Sono Sasaki, Kazuhito Tsukagoshi, Takao Mori, Henning Sirringhaus, Hiroshi Nishihara

    Angewandte chemie international edition   63 ( 9 )   e202318181   2024.1

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    <jats:p>Heterostructures of two‐dimensional materials realise novel and enhanced physical phenomena, making them attractive research targets. Compared to inorganic materials, coordination nanosheets have virtually infinite combinations, leading to tunability of physical properties and are promising candidates for heterostructure fabrication. Although stacking of coordination materials into vertical heterostructures is widely reported, reports of lateral coordination material heterostructures are few. Here we show the successful fabrication of a seamless lateral heterojunction showing diode behaviour, by sequential and spatially limited immersion of a new metalladithiolene coordination nanosheet, Zn3BHT, into aqueous Cu(II) and Fe(II) solutions. Upon immersion, the Zn centres in insulating Zn3BHT are replaced by Cu or Fe ions, resulting in conductivity. The transmetallation is spatially confined, occurring only within the immersed area. We anticipate that our results will be a starting point towards exploring transmetallation of various two‐dimensional materials to produce lateral heterojunctions, by providing a new and facile synthetic route.</jats:p>

    DOI: 10.1002/ANIE.202318181

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  • Manipulating the Morphology and Electronic State of a Two-Dimensional Coordination Polymer as a Hydrogen Evolution Cocatalyst Enhances Photocatalytic Overall Water-Splitting Reviewed

    Jingyan Guan, Kazuma Koizumi, Naoya Fukui, Hajime Suzuki, Kantaro Murayama, Ryojun Toyoda, Hiroaki Maeda, Kazuhide Kamiya, Keitaro Ohashi, Shinya Takaishi, Osamu Tomita, Akinori Saeki, Hiroshi Nishihara, Hiroshi Kageyama, Ryu Abe, Ryota Sakamoto

    ACS Catalysis   14 ( 2 )   1146 - 1156   2024.1

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    DOI: 10.1021/acscatal.3c04389

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  • Manipulation of Chemical and Crystal Structures of Multilayered Copper-Hexaaminobenzene Coordination Nanosheets to Modulate Conductivity with Precise Control of Liquid-Liquid Interfacial Synthesis Reviewed

    Hiroaki Maeda, Kenji Takada, Naoya Fukui, Junzo Ukai, Nobutaka Honma, Sono Sasaki, Hiroyasu Masunaga, Kenichi Kato, Hiroshi Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   2023.11

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    DOI: 10.1007/s10904-023-02920-5

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  • A Bis(terpyridine)nickel(II)-Based Coordination Nanosheet: A Redox-Active Material with Flexibility and Transparency Reviewed

    Kenji Takada, Hiroaki Maeda, Hiroshi Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   2023.11

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    DOI: 10.1007/s10904-023-02921-4

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  • 二次元メタラジチオレンナノシートの発展と将来展望 Reviewed

    前田啓明、髙田健司、福居直哉、長島佐代子、西原 寛

    Acc. Mater. Surf. Res.   8 ( 3 )   116 - 124   2023.10

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  • Terpyridine-zinc(II) coordination nanosheets as modulators of perovskite crystallization to enhance solar cell efficiency Reviewed

    Ying-Chiao Wang, Chun-Hao Chiang, Chun-Jen Su, Je-wei Chang, Chi-Ying Lin, Chia-Chun Wei, Shao-Ku Huang, Hiroaki Maeda, Wen-Bin Jian, U-Ser Jeng, Kazuhito TSUKAGOSHI, Chun-Wei Chen, Hiroshi Nishihara

    Journal of Materials Chemistry A   DOI: 10.1039/D3TA00505D   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    The high efficiency of precursor-to-perovskite conversion is one of the core factors in boosting the performance of perovskite solar cells (PSCs). Herein, we report a liquid/liquid interfacial synthesis of terpyridine-zinc(II)...

    DOI: 10.1039/d3ta00505d

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  • Chemical bottom-up approach for inorganic single-atomic layers aiming beyond graphene

    Tetsuya Kambe, Hiroshi Nishihara, Kimihisa Yamamoto

    Dalton Transactions   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    A chemical bottom-up approach for single-atomic layered materials like graphene is attractive due to the possibility of introducing functions. This article includes the synthesis and properties of borophene-oxide and metalladithiolene...

    DOI: 10.1039/d3dt01636f

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  • Near‐Infrared Light‐Emitting Diodes from Organic Radicals with Charge Control Reviewed

    Neil C. Greenham, Yuki Tani, Ryota Matsuoka, Hiroshi Nishihara, Richard H. Friend, Tetsuro Kusamoto, Emrys W. Evans

    Advanced Optical Materials   2022   2200628   2022.8

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    DOI: 10.1002/adom.202200628

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  • A Series of D–A–D Structured Disilane-Bridged Triads: Structure and Stimuli-Responsive Luminescence Studies

    Hiroto Miyabe, Mizuha Ujita, Masaki Nishio, Toyotaka Nakae, Tsukasa Usuki, Minako Ikeya, Chika Nishimoto, Suguru Ito, Mineyuki Hattori, Satoshi Takeya, Shigenobu Hayashi, Daisuke Saito, Masako Kato, Hiroshi Nishihara, Teppei Yamada, Yoshinori Yamanoi

    The Journal of Organic Chemistry   87 ( 14 )   8928 - 8938   2022.7

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.joc.2c00641

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  • Conductive coordination nanosheets: Sailing to electronics, energy storage, and catalysis Reviewed

    Hiroaki Maeda, Kenji Takada, Naoya Fukui, Sayoko Nagashima, Hiroshi Nishihara

    COORDINATION CHEMISTRY REVIEWS   470   214693   2022.7

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    DOI: 10.1016/j.ccr.2022.214693

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  • Chemically Laminated 2D Bis(terpyridine)metal Polymer Films: Formation Mechanism at the Liquid-Liquid Interface and Redox Rectification Reviewed

    J. Komeda, K. Takada, H. Maeda, N. Fukui, T. Tsuji, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   e202201316   2022.7

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    DOI: 10.1002/chem.202201316

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  • Superior Multielectron‐Transferring Energy Storage by π‐d Conjugated Frameworks Reviewed

    Dong Xia, Ken Sakaushi, Andrey Lyalin, Keisuke Wada, Sonu Kumar, Marco Amores, Hiroaki Maeda, Sono Sasaki, Tetsuya Taketsugu, Hiroshi Nishihara

    Small   2202861   2202861 - 2202861   2022.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/smll.202202861

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/smll.202202861

  • Two-Dimensional Metal–Organic Framework Acts as a Hydrogen Evolution Cocatalyst for Overall Photocatalytic Water Splitting

    Jingyan Guan, Tigmansu Pal, Kazuhide Kamiya, Naoya Fukui, Hiroaki Maeda, Tetsu Sato, Hajime Suzuki, Osamu Tomita, Hiroshi Nishihara, Ryu Abe, Ryota Sakamoto

    ACS Catalysis   12 ( 7 )   3881 - 3889   2022.4

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acscatal.1c05889

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  • Heterometallic Benzenehexathiolato Coordination Nanosheets: Periodic Structure Improves Crystallinity and Electrical Conductivity

    Ryojun Toyoda, Naoya Fukui, Dionisius H.L. Tjhe, Ekaterina Selezneva, Hiroaki Maeda, Cédric Bourgès, Choon Meng Tan, Kenji Takada, Yuanhui Sun, Ian Jacobs, Kazuhide Kamiya, Hiroyasu Masunaga, Takao Mori, Sono Sasaki, Henning Sirringhaus, Hiroshi Nishihara

    Advanced Materials   34 ( 13 )   2022.4

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/adma.202106204

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  • Amplification of luminescence of stable radicals by coordination to NHC–gold(i) complex

    Yohei Hattori, Ryota Kitajima, Ryota Matsuoka, Tetsuro Kusamoto, Hiroshi Nishihara, Kingo Uchida

    Chemical Communications   58 ( 15 )   2560 - 2563   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    The 4% fluorescence quantum yield of F2PyBTM radical in dichloromethane was enhanced up to 36% by coordination to AuI with <italic>N</italic>-heterocyclic carbene ligand.

    DOI: 10.1039/d1cc06555f

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  • An Organic Quantum Spin Liquid with Triangular Lattice: Spinon Fermi Surface and Scaling Behavior

    Tetsuro Kusamoto, Chie Ohde, Shiori Sugiura, Satoshi Yamashita, Ryota Matsuoka, Taichi Terashima, Yasuhiro Nakazawa, Hiroshi Nishihara, Shinya Uji

    Bulletin of the Chemical Society of Japan   95 ( 2 )   306 - 313   2022

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1246/bcsj.20210411

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  • Luminescent behavior elucidation of disilane‐bridged D‒A‒D triad composed of phenothiazine and thienopyrazine

    Toyotaka Nakae, Masaki Nishio, Tsukasa Usuki, Minako Ikeya, Chika Nishimoto, Suguru Ito, Hiroshi Nishihara, Mineyuki Hattori, Shigenobu Hayashi, Teppei Yamada, Yoshinori Yamanoi

    Angewandte Chemie International Edition   60 ( 42 )   22871 - 22878   2021.8

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/anie.202108089

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  • Two-Dimensional π-Conjugated Frameworks as a Model System to Unveil a Multielectron-Transfer-Based Energy Storage Mechanism

    Ken Sakaushi, Hiroshi Nishihara

    Accounts of Chemical Research   54 ( 15 )   3003 - 3015   2021.8

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.accounts.1c00172

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  • Two-Dimensional Bis(dithiolene)iron(II) Self-Powered UV Photodetectors with Ultrahigh Air Stability Reviewed

    Ying Chiao Wang, Chun Hao Chiang, Chi Ming Chang, Hiroaki Maeda, Naoya Fukui, I. Ta Wang, Cheng Yen Wen, Kuan Cheng Lu, Shao Ku Huang, Wen Bin Jian, Chun Wei Chen, Kazuhito Tsukagoshi, Hiroshi Nishihara

    Advanced Science   8 ( 14 )   2100564   2021.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/advs.202100564

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  • Expansion of Photostable Luminescent Radical by Meta-Substitution. International journal

    Yohei Hattori, Shunsuke Tsubaki, Ryota Matsuoka, Tetsuro Kusamoto, Hiroshi Nishihara, Kingo Uchida

    Chemistry, an Asian journal   2021.7

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    Polychlorinated pyridyldiphenylmethyl radicals having substituents meta to the position bearing the carbon-centered radical (α-carbon) are synthesized. All of them are stable in ambient conditions in solutions and fluorescent in cyclohexane. The fluorescence of the radicals with bromo, phenyl, 4-chlorophenyl, or pyridyl substituents are enhanced in chloroform, while the emission of the radicals with 2-thienyl or 2-furyl substituents are quenched in chloroform. DFT and TD-DFT calculations indicate that the first doublet excited states of the former are locally excited, while the first doublet excited states of the latter are charge transfer states from the π-electron-donating substituent to the accepting radical. The latter also show much higher photostability under 370-nm light irradiation compared with the first reported photostable fluorescent radical, (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical (PyBTM), with pronounced bathochromic shifts of the fluorescence.

    DOI: 10.1002/asia.202100612

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  • Ultralong π-Conjugated Bis(terpyridine)metal Polymer Wires Covalently Bound to a Carbon Electrode: Fast Redox Conduction and Redox Diode Characteristics

    Kuo-Hui Wu, Ryota Sakamoto, Hiroaki Maeda, Eunice Jia Han Phua, Hiroshi Nishihara

    Molecules   26 ( 14 )   4267 - 4267   2021.7

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    We developed an efficient and convenient electrochemical method to synthesize π-conjugated redox metal-complex linear polymer wires composed of azobenzene-bridged bis(terpyridine)metal (2-M, M = Fe, Ru) units covalently immobilized on glassy carbon (GC). Polymerization proceeds by electrochemical oxidation of bis(4′-(4-anilino)-2,2′:6′,2″-terpyridine)metal (1-M) in a water–acetonitrile–HClO4 solution, affording ultralong wires up to 7400 mers (corresponding to ca. 15 μm). Both 2-Fe and 2-Ru undergo reversible redox reactions, and their redox behaviors indicate remarkably fast redox conduction. Anisotropic hetero-metal-complex polymer wires with Fe and Ru centers are constructed via stepwise electropolymerization. The cyclic voltammograms of two hetero-metal-complex polymer wires, GC/[2-Fe]–[2-Ru] (3) and GC/[2-Ru]–[2-Fe] (4), show irreversible redox reactions with opposite electron transfer characteristics, indicating redox diodelike behavior. In short, the present electrochemical method is useful to synthesize polymer wire arrays and to integrate functional molecules on carbon.

    DOI: 10.3390/molecules26144267

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  • Dirac point shift of graphene-FET in the presence of ionic molecules or surfactants

    Mariko Miyachi, Wenchao Zhu, Toyotaka Nakae, Yoshinori Yamanoi, Takashi Ikuta, Kenzo Maehashi, Hiroshi Nishihara

    Chemistry Letters   50 ( 9 )   1639 - 1642   2021.6

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    DOI: 10.1246/cl.210310

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  • Electrochemically Synthesized Bis(diimino)metal Coordination Nanosheets as Ultrastable Electrocatalysts for Hydrogen Evolution Reaction Reviewed

    K.-H. Wu, J. Cao, T. Pal, H. Yang, H. Nishihara

    ACS Applied Energy Materials   4 ( 6 )   5403 - 5407   2021.6

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    DOI: 10.1021/acsaem.1c01265

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  • Bio-organic-inorganic hybrid soft materials: photoelectric conversion systems based on photosystem I and II with molecular wires

    Yoshinori Yamanoi, Toyotaka Nakae, Hiroshi Nishihara

    Chemistry Letters   2021.4

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    DOI: 10.1246/cl.210111

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  • Radical-Based Coordination Polymers as a Platform for Magnetoluminescence Reviewed

    S. Kimura, R. Matsuoka, S. Kimura, H. Nishihara, T. Kusamoto

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   143 ( 15 )   5610 - 5615   2021.4

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  • An Open-shell, Luminescent, Two-Dimensional Coordination Polymer with a Honeycomb Lattice and Triangular Organic Radical Reviewed

    S. Kimura, M. Uejima, W. Ota, T. Sato, S. Kusaka, R. Matsuda, H. Nishihara, T. Kusamoto

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   143 ( 11 )   4329 - 4338   2021.3

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    DOI: 10.1021/jacs.0c13310

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  • A ground-state-dominated magnetic field effect on the luminescence of stable organic radicals Reviewed

    S. Kimura, S. Kimura, K. Kato, Y. Teki, H. Nishihara, T. Kusamoto

    Chemical Science   12 ( 6 )   2025 - 2029   2021.2

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    DOI: 10.1039/d0sc05965j

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  • Determination of Chemical Structure of Bis(dithiolato)iron Nanosheet

    Choon Meng Tan, Mami Horikawa, Naoya Fukui, Hiroaki Maeda, Sono Sasaki, Kazuhito Tsukagoshi, Hiroshi Nishihara

    Chemistry Letters   2020.12

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    DOI: 10.1246/cl.200797

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  • Tailoring the Electrochemical Properties of Two-Dimensional Bis(diimino)metal Coordination Frameworks by Introducing Co/Ni Heterometallic Structures Reviewed

    Keisuke Wada, Hiroaki Maeda, Takuya Tsuji, Ken Sakaushi, Sono Sasaki, Hiroshi Nishihara

    INORGANIC CHEMISTRY   59 ( 15 )   10604 - 10610   2020.8

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    DOI: 10.1021/acs.inorgchem.0c01055

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  • Thermosalience in Macrocycle-Based Soft Crystals via Anisotropic Deformation of Disilanyl Architecture Reviewed

    Kenichiro Omoto, Toyotaka Nakae, Masaki Nishio, Yoshinori Yamanoi, Hidetaka Kasai, Eiji Nishibori, Takaki Mashimo, Tomohiro Seki, Hajime Ito, Kazuki Nakamura, Norihisa Kobayashi, Naofumi Nakayama, Hitoshi Goto, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   142 ( 29 )   12651 - 12657   2020.7

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    DOI: 10.1021/jacs.0c03643

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  • Photoelectric Conversion System Composed of Gene-Recombined Photosystem I and Platinum Nanoparticle Nanosheet Reviewed

    Wenchao Zhu, Raphael Salles, Mariko Miyachi, Yoshinori Yamanoi, Tatsuya Tomo, Hiromi Takahashi, Hiroshi Nishihara

    LANGMUIR   36 ( 23 )   6429 - 6435   2020.6

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  • Effects of halogen atom replacement on the structure and magnetic properties of a molecular crystal with supramolecular two-dimensional network mediated via sulfur's sigma-holes Reviewed

    Chie Ohde, Tetsuro Kusamoto, Hiroshi Nishihara

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   497   2020.3

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  • Tri- and Tetranuclear Metal-String Complexes with Metallophilic d(10)-d(10) Interactions Reviewed

    Marian Olaru, Julius F. Koegel, Risa Aoki, Ryota Sakamoto, Hiroshi Nishihara, Enno Lork, Stefan Mebs, Matthias Vogt, Jens Beckmann

    CHEMISTRY-A EUROPEAN JOURNAL   26 ( 1 )   275 - 284   2020.1

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    DOI: 10.1002/chem.201904106

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  • Cyclization from Higher Excited States of Diarylethenes Having a Substituted Azulene Ring Reviewed

    Y. Hattori, T. Maejima, Y. Sawae, J. Kitai, M. Morimoto, R. Toyoda, H. Nishihara, S. Yokojima, S. Nakamura, K. Uchida

    CHEMISTRY-A EUROPEAN JOURNAL   x ( 50 )   x - x   2020

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    DOI: 10.1002/chem.202001671

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  • Excimer emission and magnetoluminescence of radical-based zinc(II) complexes doped in host crystals Reviewed

    S. Kimura, S. Kimura, H. Nishihara, T. Kusamoto

    CHEMICAL COMMUNICATIONS   x   x - x   2020

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    DOI: 10.1039/d0cc04830e

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  • ‘Click’ conjugated porous polymer nanofilm with a large domain size created by a liquid/liquid interfacial protocol Reviewed

    J. Komeda, R. Shiotsuki, A. Rapakousiou, R. Sakamoto, R. Toyoda, K. Iwase, M. Tsuji, K. Kamiya, H. Nishihara

    CHEMICAL COMMUNICATIONS   56 ( 25 )   3677 - 3680   2020

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    DOI: 10.1039/d0cc00360c

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  • Reversible Energy Storage in Layered Copper-Based Coordination Polymers: Unveiling the Influence of the Ligand's Functional Group on Their Electrochemical Properties Reviewed

    M. Amores, K. Wada, K. Sakaushi, H. Nishihara

    Journal of Physical Chemistry C   124   9215 - 9224   2020

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    DOI: 10.1021/acs.jpcc.0c01486

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  • Solution-processed organometallic quasi-two-dimensional nanosheets as hole buffer layer for organic light-emitting devices Reviewed

    S. Liu, Y.-C. Wang, C.-M. Chang, T. Yasuda, N. Fukui, H. Maeda, P. Long, K. Nakazato, W.-B. Jian, W. Xie, K. Tsukagoshi, H. Nishihara

    Nanoscale   12 ( 13 )   6983 - 6990   2020

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    DOI: 10.1039/D0NR00240B

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  • Effect of the Tris(trimethylsilyl)silyl Group on the Fluorescence and Triplet Yields of Oligothiophenes Reviewed

    S. Hirata, M. Nishio, H. Uchida, T. Usuki, T. Nakae, M. Miyachi, Y. Yamanoi, H. Nishihara

    Journal of Physical Chemistry C   124 ( 5 )   3277 - 3286   2020

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    DOI: 10.1021/ACS.JPCC.9B10718

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  • Construction of Bis(2,6-bis(1-methylbenzimidazol-2-yl)pyridine)iron(II) Coordination Polymer for Incorporation of Magnetic Function Reviewed

    H. Maeda, A. Bajpayee, T. Kusamoto, H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   30 ( 1 )   147 - 152   2020

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    DOI: 10.1007/S10904-019-01375-X

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  • Redox-active, luminescent coordination nanosheet capsules containing magnetite Reviewed

    R. Arai, M. Li, R. Toyoda, H. Maeda, H. Nishihara

    Scientific Reports   10 ( 1 )   13818 - 13818   2020

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  • Selective formation and SHG intensity of non-centrosymmetric and centrosymmetric 1,1,2,2-tetramethyl-1-(4-(N,N-dimethylamino)phenyl)-2-(2'-cyanophenyl)disilane crystals under external stimuli Reviewed

    M. Nishio, M. Shimada, K. Omoto, T. Nakae, H. Maeda, M. Miyachi, Y. Yamanoi, E. Nishibori, N. Nakayama, H. Goto, T. Matsushita, T. Kondo, M. Hattori, K. Jimura, S. Hayashi, H. Nishihara

    Journal of Physical Chemistry C   124 ( 32 )   17450 - 17458   2020

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    DOI: 10.1021/acs.jpcc.0c031

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  • High-energy, Long-cycle-life Secondary Battery with Electrochemically Pre-doped Silicon Anode Reviewed

    Y. Wang, M. Satoh, M. Arao, M. Matsumoto, H. Imai, H. Nishihara

    Scientific Reports   10 ( 1 )   3208   2020

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  • Electrochemical interfacing of Prussian blue nanocrystals with an ITO electrode modified with a thin film containing a Ru complex Reviewed

    Hiroaki Sato, Mitsutoshi Ide, Ryo Saito, Takanari Togashi, Katsuhiko Kanaizuka, Masato Kurihara, Hiroshi Nishihara, Hiroaki Ozawa, Masa-aki Haga

    JOURNAL OF MATERIALS CHEMISTRY C   7 ( 40 )   12491 - 12501   2019.10

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  • The Accelerating World of Graphdiynes Reviewed

    Ryota Sakamoto, Naoya Fukui, Hiroaki Maeda, Ryota Matsuoka, Ryojun Toyoda, Hiroshi Nishihara

    ADVANCED MATERIALS   31 ( 42 )   2019.10

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  • Enhancement of the Photofunction of Phosphorescent Pt(II) Cyclometalated Complexes Driven by Substituents: Solid-State Luminescence and Circularly Polarized Luminescence Reviewed

    Tsukasa Usuki, Hikaru Uchida, Kenichiro Omoto, Yoshinori Yamanoi, Ayano Yamada, Munetaka Iwamura, Koichi Nozaki, Hiroshi Nishihara

    JOURNAL OF ORGANIC CHEMISTRY   84 ( 17 )   10749 - 10756   2019.9

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  • Interfacial transmetallation synthesis of a platinadithiolene nanosheet as a potential 2D topological insulator Reviewed

    Tigmansu Pal, Shotaro Doi, Hiroaki Maeda, Keisuke Wada, Choon Meng Tan, Naoya Fukui, Ryota Sakamoto, Shinji Tsuneyuki, Sono Sasaki, Hiroshi Nishihara

    CHEMICAL SCIENCE   10 ( 20 )   5218 - 5225   2019.5

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    DOI: 10.1039/c9sc01144g

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  • Dioxacyclophanes as a Scaffold for Silicon-based Circularly Polarized Luminescent Materials Reviewed

    Yoshinori Yamanoi, Tsukasa Usuki, Kenichiro Omoto, Masaki Shimada, Hikaru Koike, Munetaka Iwamura, Koichi Nozaki, Daisuke Saito, Masako Kato, Hiroshi Nishihara

    TETRAHEDRON LETTERS   60 ( 16 )   1108 - 1112   2019.4

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  • NIR Emission and Acid-Induced Intramolecular Electron Transfer Derived from a SOMO-HOMO Converted Non-Aufbau Electronic Structure Reviewed

    Akira Tanushi, Shun Kimura, Tetsuro Kusamoto, Moe Tominaga, Yasutaka Kitagawa, Masayoshi Nakano, Hiroshi Nishihara

    JOURNAL OF PHYSICAL CHEMISTRY C   123 ( 7 )   4417 - 4423   2019.2

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  • Effects of Substituents on the Blue Luminescence of Disilane-Linked Donor-Acceptor-Donor Triads Reviewed

    Tsukasa Usuki, Kenichiro Omoto, Masaki Shimada, Yoshinori Yamanoi, Hidetaka Kasai, Eiji Nishibori, Hiroshi Nishihara

    MOLECULES   24 ( 3 )   2019.2

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    DOI: 10.3390/molecules24030521

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  • Aurophilicity and Photoluminescence of (6-Diphenylpnicogenoacenaphth-5-yl)gold Compounds Reviewed

    Truong Giang Do, Emanuel Hupf, Enno Lork, Julius F. Koegel, Fabian Mohr, Alex Brown, Ryojun Toyoda, Ryota Sakamoto, Hiroshi Nishihara, Stefan Mebs, Jens Beckmann

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   ( 5 )   647 - 659   2019.2

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    DOI: 10.1002/ejic.201801190

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  • A single-stranded coordination copolymer affords heterostructure observation and photoluminescence intensification Reviewed

    Ryojun Toyoda, Ryota Sakamoto, Naoya Fukui, Ryota Matsuoka, Mizuho Tsuchiya, Hiroshi Nishihara

    SCIENCE ADVANCES   5 ( 1 )   2019.1

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    DOI: 10.1126/sciadv.aau0637

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  • Photosensing System Using Photosystem I and Gold Nanoparticle on Graphene Field-Effect Transistor Reviewed International journal

    D. Nishiori, W. Zhu, R. Salles, M. Miyachi, Y. Yamanoi, T. Ikuta, K. Maehashi, T. Tomo, H. Nishihara

    ACS Applied Materials & Interfaces   11 ( 45 )   42773 - 42779   2019

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    In this study, a light sensor is fabricated based on photosystem I (PSI) and a graphene field-effect transistor (FET) that detects light at a high quantum yield under ambient conditions. We immobilized PSI on a micrometer-sized graphene FET using Au nanoparticles (AuNPs) and measured the I-V characteristics of the modified graphene FET before and after light irradiation. The source-drain current (Isd) increased upon illumination, exhibiting a photoresponsivity of 4.8 × 102 A W-1, and the charge neutrality point of graphene shifted by -12 mV. This system represents the first successful photosensing system based on proteins and a solution-gated graphene FET. The probable mechanism of this negative shift can be explained by the increase in negative charge carriers in graphene induced by a hole trap in the AuNP resulting from electron transfer from the AuNP to PSI. Photoresponses were only observed in the presence of two surface-active agents, n-hexyltrimethylammonium bromide and sodium dodecylbenzenesulfonate, because they caused the formation of a hydrophobic environment on the surface of the graphene. The lipid layer of these agents caused dissociation of ascorbate ions from the graphene sheet, thereby expanding the Debye screening length of the electrolyte solution. The hydrophobic environment above graphene also enhanced hole storage in the AuNP through electron transfer from the AuNP to PSI.

    DOI: 10.1021/ACSAMI.9B14771

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  • Zero-, one- and two-dimensional bis(dithiolato)metal complexes with unique physical and chemical properties Reviewed

    T. Kusamoto, H. Nishihara

    COORDINATION CHEMISTRY REVIEWS   380   419 - 439   2019

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    DOI: 10.1016/J.CCR.2018.09.012

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  • 2D Optical Imaging Using Photosystem I Photosensor Platform with 32x32 CMOS Biosensor Array Reviewed

    K.Niitsu, T. Sakabe, M. Miyachi, Y. Yamanoi, H. Nishihara, T. Tomo, K. Nakazato

    24TH ASIA AND SOUTH PACIFIC DESIGN AUTOMATION CONFERENCE (ASP-DAC 2019)   7 - 8   2019

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    DOI: 10.1145/3287624.3287751

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  • Electrochromic triphenylamine-based cobalt(II) complex nanosheets Reviewed

    Y. Liu, R. Sakamoto, C.-H. Ho, H. Nishihara, W.-Y. R. Wong

    Journal of Materials Chemistry C   7   9159 - 9166   2019

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    DOI: 10.1039/C9TC02257K

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  • One-dimensional magnetic chain composed of CuII and polychlorinated dipyridylphenylmethyl radical: temperature-dependent Jahn-Teller distortion correlated to π-conjugation and magnetic properties Reviewed

    S. Kimura, H. Uchida, T. Kusamoto, H. Nishihara

    DALTON TRANSACTIONS   48   7090 - 7093   2019

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    DOI: 10.1039/C8DT05104F

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  • Luminescent Radical-Excimer: Excited-State Dynamics of Luminescent Radicals in Doped Host Crystals Reviewed

    K. Kato, S. Kimura, T. Kusamoto, H. Nishihara, Y. Teki

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   58 ( 9 )   2606 - 2611   2019

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    DOI: 10.1002/ANIE.201813479

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  • Demonstration of 2D Optical Imaging Using Photosystem i Photosensor Platform with 3232 CMOS Biosensor Array

    Kiichi Niitsu, Taichi Sakabe, Mariko Miyachi, Yoshinori Yamanoi, Hiroshi Nishihara, Tatsuya Tomo, Kazuo Nakazato

    2018 16th IEEE International New Circuits and Systems Conference, NEWCAS 2018   104 - 108   2018.12

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    DOI: 10.1109/NEWCAS.2018.8585603

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  • A pyrazine-incorporated graphdiyne nanofilm as a metal-free electrocatalyst for the hydrogen evolution reaction Reviewed

    Ryota Sakamoto, Ryo Shiotsuki, Keisuke Wada, Naoya Fukui, Hiroaki Maeda, Joe Komeda, Ryosuke Sekine, Koji Harano, Hiroshi Nishihara

    JOURNAL OF MATERIALS CHEMISTRY A   6 ( 44 )   22189 - 22194   2018.11

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    DOI: 10.1039/c8ta07347c

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  • Multielectron-Transfer-based Rechargeable Energy Storage of Two-Dimensional Coordination Frameworks with Non-Innocent Ligands Reviewed

    Keisuke Wada, Ken Sakaushi, Sono Sasaki, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   57 ( 29 )   8886 - 8890   2018.7

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    DOI: 10.1002/anie.201802521

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  • Aggregation-Induced Emission Enhancement from Disilane-Bridged Donor-Acceptor-Donor Luminogens Based on the Triarylamine Functionality Reviewed

    Tsukasa Usuki, Masaki Shimada, Yoshinori Yamanoi, Tatsuhiko Ohto, Hirokazu Tada, Hidetaka Kasai, Eiji Nishibori, Hiroshi Nishihara

    ACS APPLIED MATERIALS & INTERFACES   10 ( 15 )   12164 - 12172   2018.4

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    DOI: 10.1021/acsami.7b14802

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  • Dinuclear Diphosphine Complexes of Gold(I) Alkynyls, the Effects of Alkynyl Substituents onto Photophysical Behavior Reviewed

    Julia R. Shakirova, Masaki Shimada, Dmitrii A. Olisov, Galina L. Starova, Hiroshi Nishihara, Sergey P. Tunik

    ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE   644 ( 5 )   308 - 316   2018.3

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    DOI: 10.1002/zaac.201700415

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  • Demonstration of 2D Optical Imaging Using Photosystem I Photosensor Platform with 3232 CMOS Biosensor Array.

    Kiichi Niitsu, Taichi Sakabe, Mariko Miyachi, Yoshinori Yamanoi, Hiroshi Nishihara, Tatsuya Tomo, Kazuo Nakazato

    104 - 108   2018

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    DOI: 10.1109/NEWCAS.2018.8585603

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  • A luminescent organic radical with two pyridyl groups: high photostability and dual stimuli-responsive properties, with theoretical analyses of photophysical processes Reviewed

    S. Kimura, A. Tanushi, T. Kusamoto, S. Kochi, T. Sato, H. Nishihara

    Chemical Science   9 ( 7 )   1996 - 2007   2018

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    <p>Increased photostability and a theoretical estimation of the radiative and non-radiative rates of luminescent organic radicals were achieved.</p>

    DOI: 10.1039/c7sc04034b

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  • Cation-responsive turn-on fluorescence and absence of heavy atom effects of pyridyl-substituted triarylmethyl radicals Reviewed

    Y. Hattori, S. Kimura, T. Kusamoto, H. Maeda, H. Nishihara

    CHEMICAL COMMUNICATIONS   54   615 - 618   2018

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    DOI: 10.1039/C7CC08568K

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  • Oxidation-promoted Interfacial Synthesis of Redox-active Bis(diimino)nickel Nanosheet Reviewed

    Eunice J. H. Phua, Kuo-Hui Wu, Keisuke Wada, Tetsuro Kusamoto, Hiroaki Maeda, Jian Cao, Ryota Sakamoto, Hiroyasu Masunaga, Sono Sasaki, Jia-Wei Mei, Wei Jiang, Feng Liu, Hiroshi Nishihara

    CHEMISTRY LETTERS   47 ( 2 )   126 - 129   2018

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    DOI: 10.1246/cl.170928

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  • Expansion of the Graphdiyne Family: A Triphenylene-Cored Analogue Reviewed

    R. Matsuoka, R. Toyoda, R. Shiotsuki, N. Fukui, K. Wada, H. Maeda, R. Sakamoto, S. Sasaki, H. Masunaga, K. Nagashio, H. Nishihara

    ACS Applied Materials & Interfaces   11 ( 3 )   2730 - 2733   2018

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    DOI: 10.1021/acsami.8b00743

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  • Efficiency breakthrough for radical LEDs Reviewed

    T. Kusamoto, H. Nishihara

    NATURE   563(7732)   480 - 481   2018

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    DOI: 10.1038/D41586-018-07394-X

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  • Magnetoluminescence in a Photostable, Brightly Luminescent Organic Radical in a Rigid Environment Reviewed

    S. Kimura, T. Kusamoto, S. Kimura, K. Kato, Y. Teki, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   57 ( 39 )   12711 - 12715   2018

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    DOI: 10.1002/ANIE.201805466

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  • Bis(aminothiolato)nickel nanosheet as a redox switch for conductivity and an electrocatalyst for the hydrogen evolution reaction Reviewed

    Xinsen Sun, Kuo-Hui Wu, Ryota Sakamoto, Tetsuro Kusamoto, Hiroaki Maeda, Xiaojuan Ni, Wei Jiang, Feng Liu, Sono Sasaki, Hiroyasu Masunaga, Hiroshi Nishihara

    CHEMICAL SCIENCE   8 ( 12 )   8078 - 8085   2017.12

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    DOI: 10.1039/c7sc02688a

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  • Bis(dipyrrinato)zinc(II) Complex Chiroptical Wires: Exfoliation into Single Strands and Intensification of Circularly Polarized Luminescence Reviewed

    Risa Aoki, Ryojun Toyoda, Julius F. Koegel, Ryota Sakamoto, Jatish Kumar, Yasutaka Kitagawa, Koji Harano, Tsuyoshi Kawai, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 45 )   16024 - 16027   2017.11

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    DOI: 10.1021/jacs.7b07077

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  • Mechano-, thermo-, solvato-, and vapochromism in bis(acetato-kappa O-1)[4 '-(4-(diphenylamino)phenyl)](2,2 ': 60,2 ''-terpyridine-kappa(3) N, N ', N '') zinc(II) and its polymer Reviewed

    Takamasa Tsukamoto, Risa Aoki, Ryota Sakamoto, Ryojun Toyoda, Masaki Shimada, Yohei Hattori, Yasutaka Kitagawa, Eiji Nishibori, Masayoshi Nakano, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   53 ( 70 )   9805 - 9808   2017.9

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    DOI: 10.1039/c7cc05022d

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  • Synthesis and physical properties of tetrasila[2.2]thiophenophane derivatives for the luminescent and chiroptical materials Reviewed

    Masaki Shimada, Yoshinori Yamanoi, Kenichiro Omoto, Shohei Tashiro, Mitsuhiko Shionoya, Tatsuhiko Ohto, Song Pham, Ryo Yamada, Hirokazu Tada, Mineyuki Hattori, Keiko Jimura, Shigenobu Hayashi, Hikaru Koike, Munetaka Iwamura, Koichi Nozaki, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   254   2017.8

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  • Conducting pi-Conjugated Bis(iminothiolato)nickel Nanosheet Reviewed

    Xinsen Sun, Kuo-Hui Wu, Ryota Sakamoto, Tetsuro Kusamoto, Hiroaki Maeda, Hiroshi Nishihara

    CHEMISTRY LETTERS   46 ( 8 )   1072 - 1075   2017.8

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    DOI: 10.1246/cl.170382

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  • Multifunctional Octamethyltetrasila[2.2]cyclophanes: Conformational Variations, Circularly Polarized Luminescence, and Organic Electroluminescence Reviewed

    Masaki Shimada, Yoshinori Yamanoi, Tatsuhiko Ohto, Song-Toan Pham, Ryo Yamada, Hirokazu Tada, Kenichiro Omoto, Shohei Tashiro, Mitsuhiko Shionoya, Mineyuki Hattori, Keiko Jimura, Shigenobu Hayashi, Hikaru Koike, Munetaka Iwamura, Koichi Nozaki, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 32 )   11214 - 11221   2017.8

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    DOI: 10.1021/jacs.7b05671

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  • beta-IminoBODIPY oligomers: facilely accessible pi-conjugated luminescent BODIPY arrays Reviewed

    Mizuho Tsuchiya, Ryota Sakamoto, Masaki Shimada, Yoshinori Yamanoi, Yohei Hattori, Kunihisa Sugimoto, Eiji Nishibori, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   53 ( 54 )   7509 - 7512   2017.7

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    DOI: 10.1039/c7cc03279j

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  • Liquid/Liquid Interfacial Synthesis of a Click Nanosheet Reviewed

    Amalia Rapakousiou, Ryota Sakamoto, Ryo Shiotsuki, Ryota Matsuoka, Ukyo Nakajima, Tigmansu Pal, Rintaro Shimada, Amran Hossain, Hiroyasu Masunaga, Satoshi Horike, Yasutaka Kitagawa, Sono Sasaki, Kenichi Kato, Takeaki Ozawa, Didier Astruc, Hiroshi Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   23 ( 35 )   8443 - 8449   2017.6

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    DOI: 10.1002/chem.201700201

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  • Coordination nanosheets (CONASHs): strategies, structures and functions Reviewed

    Ryota Sakamoto, Kenji Takada, Tigmansu Pal, Hiroaki Maeda, Tetsuya Kambe, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   53 ( 43 )   5781 - 5801   2017.5

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    DOI: 10.1039/c7cc00810d

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  • A simple zinc(II) complex that features multi-functional luminochromism induced by reversible ligand dissociation Reviewed

    Takamasa Tsukamoto, Risa Aoki, Ryota Sakamoto, Ryojun Toyoda, Masaki Shimada, Yohei Hattori, Mizuki Asaoka, Yasutaka Kitagawa, Eiji Nishibori, Masayoshi Nakano, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   53 ( 26 )   3657 - 3660   2017.4

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    DOI: 10.1039/c6cc10190a

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  • Coordination Nanosheets Based on Terpyridine-Zinc(II) Complexes: As Photoactive Host Materials Reviewed

    Takamasa Tsukamoto, Kenji Takada, Ryota Sakamoto, Ryota Matsuoka, Ryojun Toyoda, Hiroaki Maeda, Toshiki Yagi, Michihiro Nishikawa, Naoaki Shinjo, Shuntaro Amano, Tadashi Iokawa, Narutaka Ishibashi, Tsugumi Oi, Koshiro Kanayama, Rina Kinugawa, Yoichiro Koda, Toshiyuki Komura, Shuhei Nakajima, Ryota Fukuyama, Nobuyuki Fuse, Makoto Mizui, Masashi Miyasaki, Yutaro Yamashita, Kuni Yamada, Wenxuan Zhang, Ruocheng Han, Wenyu Liu, Taro Tsubomura, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 15 )   5359 - 5366   2017.4

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    DOI: 10.1021/jacs.6b12810

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  • Solvent-Controlled Doublet Emission of an Organometallic Gold(I) Complex with a Polychlorinated Diphenyl(4-pyridyl)methyl Radical Ligand: Dual Fluorescence and Enhanced Emission Efficiency Reviewed

    Yasuyo Ogino, Tetsuro Kusamoto, Yohei Hattori, Masaki Shimada, Mizuho Tsuchiya, Yoshinori Yamanoi, Eiji Nishibori, Kunihisa Sugimoto, Hiroshi Nishihara

    INORGANIC CHEMISTRY   56 ( 7 )   3909 - 3915   2017.4

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  • Supramolecular Two-Dimensional Network Mediated via Sulfur's sigma-Holes in a Conducting Molecular Crystal: Effects of Its Rigidity on Physical Properties and Structural Transition Reviewed

    Chie Ohde, Tetsuro Kusamoto, Koji Nakabayashi, Shin-ichi Ohkoshi, Hiroshi Nishihara

    CRYSTAL GROWTH & DESIGN   17 ( 4 )   2203 - 2210   2017.4

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    DOI: 10.1021/acs.cgd.7b00165

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  • Photofunctionality in Porphyrin-Hybridized Bis(dipyrrinato)zinc(II) Complex Micro- and Nanosheets Reviewed

    Ryota Sakamoto, Toshiki Yagi, Ken Hoshiko, Shinpei Kusaka, Ryota Matsuoka, Hiroaki Maeda, Zheng Liu, Qian Liu, Wai-Yeung Wong, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   56 ( 13 )   3526 - 3530   2017.3

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    DOI: 10.1002/anie.201611785

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  • Access to Chiral Silicon Centers for Application to Circularly Polarized Luminescence Materials Reviewed International journal

    S. Koga, S. Ueki, M. Shimada, R. Ishii, Y. Kurihara, Y. Yamanoi, J. Yuasa, T. Kawai, T. Uchida, M. Iwamura, K. Nozaki, H. Nishihara

    JOURNAL OF ORGANIC CHEMISTRY   82 ( 12 )   6108 - 6117   2017

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    Asymmetric arylation of secondary silanes catalyzed by a Pd-chiral phosphoramidite complex was developed for application to low-molecular-weight circularly polarized luminescence (CPL) materials. The asymmetric arylation provided a convenient, efficient synthetic method for a variety of chiral tertiary silanes (2-21), which were key intermediates for preparing the quaternary silicon center. A stepwise, one-pot procedure was used to transform the appropriate aryl iodide to the quaternary silane (22) with good yield and enantioselectivity. Among compounds synthesized in this work, four optically pure tertiary silanes (18-21) were selected to investigate the relationship between the structure and optical properties. Optically pure (S,S)-21 displayed the highest CPL emission with a high fluorescence quantum yield (glum: +0.008, ΦF: 0.42). This simple molecular design provides new strategies for developing small organic CPL dyes.

    DOI: 10.1039/C7CC03279J

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  • Crystalline Graphdiyne Nanosheets Produced at a Gas/Liquid or Liquid/Liquid Interface Reviewed

    R. Matsuoka, R. Sakamoto, K. Hoshiko, S. Sasaki, H. Masunaga, K. Nagashio, H. Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   139 ( 8 )   3145 - 3152   2017

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    DOI: 10.1021/JACS.6B12776

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  • Photocurrent generation of reconstituted photosystem II on self-assembled gold film Reviewed International journal

    M. Miyachi, S. Ikehira, D. Nishiori, Y. Yamanoi, M. Yamada, M. Iwai, T. Tomo, S. I. Allakhverdiev, H. Nishihara

    LANGMUIR   33 ( 6 )   1351 - 1358   2017

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    Photosystem II (PSII)-modified gold electrodes were prepared by the deposition of PSII reconstituted with platinum nanoparticles (PtNPs) on Au electrodes. PtNPs modified with 1-[15-(3,5,6-trimethyl-1,4-benzoquinone-2-yl)]pentadecyl disulfide ((TMQ(CH2)15S)2) were incorporated into the QB site of PSII isolated from thermophilic cyanobacterium Thermosynechococcus elongatus. The reconstitution was confirmed by QA-reoxidation measurements. PSII reconstituted with PtNPs was deposited and integrated on a Au(111) surface modified with 4,4'-biphenyldithiol. The cross section of the reconstituted PSII film on the Au electrode was investigated by SEM. Absorption spectra showed that the surface coverage of the electrode was about 18 pmol PSII cm-2. A photocurrent density of 15 nAcm-2 at E = +0.10 V (vs Ag/AgCl) was observed under 680 nm irradiation. The photoresponse showed good reversibility under alternating light and dark conditions. Clear photoresponses were not observed in the absence of PSII and molecular wire. These results supported the photocurrent originated from PSII and moved to a gold electrode by light irradiation, which also confirmed conjugation with orientation through the molecular wire.

    DOI: 10.1021/ACS.LANGMUIR.6B03499

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  • Peptide aptamer-assisted immobilization of green fluorescent protein for creating biomolecule-complexed carbon nanotube device Reviewed

    D. Nii, Y. Nozawa, M. Miyachi, Y. Yamanoi, H. Nishihara, T. Tomo, Y. Shimada

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 10 )   107001 - 107001   2017

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    DOI: 10.7567/JJAP.56.107001

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  • Attachment chemistry of aromatic compounds on a silicon(100) surface Reviewed

    A. Henriksson, D. Nishiori, H. Maeda, M. Miyachi, Y. Yamanoi, H. Nishihara

    SURFACE SCIENCE   669   8078 - 8085   2017

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    DOI: 10.1016/J.SUSC.2017.11.017

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  • A Photochemical Hydrogen Evolution System Combining Cyanobacterial Photosystem I and Platinum Nanoparticle-terminated Molecular Wires Reviewed

    M. Miyachi, K. Okuzono, D. Nishiori, Y. Yamanoi, T. Tomo, M. Iwai, S. I. Allakhverdiev, H. Nishihara

    CHEMISTRY LETTERS   46 ( 10 )   1479 - 1481   2017

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    DOI: 10.1246/CL.170576

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  • Conjugates between photosystem I and a carbon nanotube for a photoresponse device Reviewed International journal

    D. Nii, M. Miyachi, Y. Shimada, Y. Nozawa, M. Ito, Y. Homma, S. Ikehira, Y. Yamanoi, H. Nishihara

    PHOTOSYNTHESIS RESEARCH   133 ( 1-3 )   155 - 162   2017

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    Photosystem I (PS I) is a large pigment-protein complex embedded in the thylakoid membranes that performs light-driven electron transfer across the thylakoid membrane. Carbon nanotubes exhibit excellent electrical conductivities and excellent strength and stiffness. In this study, we generated PSI-carbon nanotube conjugates dispersed in a solution aimed at application in artificial photosynthesis. PS I complexes in which a carbon nanotube binding peptide was introduced into the middle of the PsaE subunit were conjugated on a single-walled carbon nanotube, orienting the electron acceptor side to the nanotube. Spectral and photoluminescence analysis showed that the PS I is bound to a single-walled carbon nanotube, which was confirmed by transmission electron microscopy. Photocurrent observation proved that the photoexcited electron originated from PSI and transferred to the carbon nanotube with light irradiation, which also confirmed its orientated conjugation. The PS I-carbon nanotube conjugate will be a useful nano-optoelectronic device for the development of artificial systems.

    DOI: 10.1007/S11120-016-0324-0

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  • Interfacial synthesis of electrofunctional coordination nanowires and nanosheets of bis(terpyridine) complexes Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    COORDINATION CHEMISTRY REVIEWS   346   139 - 149   2017

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    DOI: 10.1016/J.CCR.2017.02.013

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  • Theoretical study on S1 and T1 states of homoleptic bis(dipyrrinato)zinc(II) model complex Reviewed

    M. Asaoka, Y. Kitagawa, R. Teramoto, K. Miyagi, Y. Natori, Ry. Sakamoto, H. Nishihara, M. Nakano

    POLYHEDRON   136   113 - 116   2017

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    DOI: 10.1016/J.POLY.2017.01.058

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  • Unusual Reactivity of Group 14 Hydrides toward Organic Halides: Synthetic Studies and Application to Functional Materials Reviewed

    Masaki Shimada, Yoshinori Yamanoi, Hiroshi Nishihara

    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN   74 ( 11 )   1098 - 1107   2016.11

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    DOI: 10.5059/yukigoseikyokaishi.74.1098

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  • Effects of Substitution on Solid-State Fluorescence in 9-Aryl-9-methyl-9H-9-silafluorenes Reviewed

    Yoshinori Yamanoi, Takayuki Nakashima, Masaki Shimada, Hiroaki Maeda, Hiroshi Nishihara

    MOLECULES   21 ( 9 )   2016.9

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    DOI: 10.3390/molecules21091173

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  • The coordination nanosheet (CONASH) Reviewed

    Ryota Sakamoto, Kenji Takada, Xinsen Sun, Tigmansu Pal, Takamasa Tsukamoto, Eunice Jia Han Phua, Amalia Rapakousiou, Ken Hoshiko, Hiroshi Nishihara

    COORDINATION CHEMISTRY REVIEWS   320   118 - 128   2016.8

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  • Effective Method for Micro-Patterning Arene-Terminated Monolayers on a Si(111) Electrode Reviewed

    Yoshinori Yamanoi, Tetsuhiro Kobayashi, Hiroaki Maeda, Mariko Miyachi, Masato Ara, Hirokazu Tada, Hiroshi Nishihara

    LANGMUIR   32 ( 27 )   6825 - 6829   2016.7

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    DOI: 10.1021/acs.langmuir.6b01370

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  • Bis(dipyrrinato)zinc(II) Complexes: Emission in the Solid State Reviewed

    Mizuho Tsuchiya, Ryota Sakamoto, Masaki Shimada, Yoshinori Yamanoi, Yohei Hattori, Kunihisa Sugimoto, Eiji Nishibori, Hiroshi Nishihara

    INORGANIC CHEMISTRY   55 ( 12 )   5732 - 5734   2016.6

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    DOI: 10.1021/acs.inorgchem.6b00431

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  • Dissymmetric Bis(dipyrrinato)zinc(II) Complexes: Rich Variety and Bright Red to Near-Infrared Luminescence with a Large Pseudo-Stokes Shift Reviewed

    Ryota Sakamoto, Toshiki Iwashima, Julius F. Koegel, Shinpei Kusaka, Mizuho Tsuchiya, Yasutaka Kitagawa, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   138 ( 17 )   5666 - 5677   2016.5

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    DOI: 10.1021/jacs.6b02128

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  • Bright Solid-State Emission of Disilane-Bridged Donor-Acceptor-Donor and Acceptor-Donor-Acceptor Chromophores Reviewed

    Masaki Shimada, Mizuho Tsuchiya, Ryota Sakamoto, Yoshinori Yamanoi, Eiji Nishibori, Kunihisa Sugimoto, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   55 ( 9 )   3022 - 3026   2016.2

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    DOI: 10.1002/anie.201509380

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  • Electron Transport Behavior Analysis of Bis(terpyridine) Metal Complex Wires on Electrodes Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    ECS Transactions   75   17 - 24   2016

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    DOI: 10.1149/07511.0017ECST

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  • Cross-Sectional TEM Analysis of an ITO Surface Coated with Photosystem I and Molecular Wires Reviewed

    M. Miyachi, Y. Yamanoi, T. Tomo, H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   26 ( 6 )   1309 - 1312   2016

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    DOI: 10.1007/S10904-016-0396-5

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  • Structural and magnetic investigations of a heterospin system composed of high-spin Mn(II) and pyridyl-containing triarylmethyl radicals Reviewed

    T. Kusamoto, S. Kimura, H. Nishihara

    CHEMISTRY LETTERS   45 ( 9 )   1057 - 1059   2016

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    <p>A novel molecular heterospin system composed of high-spin MnII (S = 5/2) and (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical (PyBTM; S = 1/2) was developed. The MnII ion formed distorted octahedral coordination geometry with two PyBTM radicals coordinated in the trans configuration. Magnetic studies disclosed an intramolecular antiferromagnetic exchange interaction between the spins on PyBTM and MnII with JR–Mn/kB of −9.7 K. The antiferromagnetic interaction was confirmed by broken-symmetry density functional theory calculations. This study reveals the definite intramolecular exchange interaction in the MnII–triarylmethyl radical system for the first time.</p>

    DOI: 10.1246/CL.160574

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  • Modulated Luminescence of a Stable Open-Shell Triarylmethyl Radical: Effects of Chemical Modification on Its Electronic Structure and Physical Properties Reviewed

    T. Kusamoto, S. Kimura, Y. Ogino, C. Ohde, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   22   17725 - 17733   2016

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    DOI: 10.1002/CHEM.201602942

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  • Synergistic luminescence enhancement of a pyridyl-substituted triarylmethyl radical based on fluorine substitution and coordination to gold Reviewed

    Y. Hattori, T. Kusamoto, T. Sato, H. Nishihara

    CHEMICAL COMMUNICATIONS   52 ( 91 )   13393 - 13396   2016

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    <p>Introduction of fluorine atoms and coordination of gold(<sc>i</sc>) to a stable fluorescent radical synergistically contributed to increase its fluorescence efficiency.</p>

    DOI: 10.1039/C6CC07898B

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  • Special issue in honor of Koichi Aoki Preface Reviewed

    J.-Y. Chen, N.-J. Yang, H. Nishihara

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   779   1 - 6   2016

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  • Creation of Electro- and Photo-functional Molecular Systems Based on Coordination Programming

    Nishihara Hiroshi

    Bulletin of Japan Society of Coordination Chemistry   67   2 - 9   2016

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    <p>In this review, a new research area on highly integrated metal-containing p-conjugated and/or redox-active systems constructed by coordination programming, which is to utilize the advantages of coordination chemistry to control the chemical bonds and arrangements of metal atoms and ions for creation of superstructures, has been reported. The topics involved are 1) interfacial synthesis of p-conjugated redox complex oligomer/polymer wires on electrodes and analysis of their electron conduction mechanism and kinetics, 2) creation of coordination nanosheets (CONASHs), 3) synthesis of p-conjugated redox metal complex oligomers, polymers and clusters and analysis of their electronic properties, 4) synthesis of metal complexes responsive to external-stimuli and analysis of their unique properties and functions, 5) metal nanoparticles coordinated with functional molecules, and 6) development of bio-photosensors using combination of cyanobacterial photosystem I and molecular wire. These research results indicate that coordination programming is a promising approach to construct intelligent hetero-molecular conjugated systems useful for development of chemical devices.</p>

    DOI: 10.4019/bjscc.67.2

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  • Coordination Programming of Two-dimensional Metal Complex Frameworks Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    LANGMUIR   32   2527 - 2840   2016

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  • Fluorescence and phosphorescence of a series of silicon-containing six-membered-ring molecules Reviewed

    T. Nakashima, M. Shimada, Y. Kurihara, M. Tsuchiya, Y. Yamanoi, E. Nishibori, K. Sugimoto, H. Nishihara

    JOURNAL OF ORGANOMETALLIC CHEMISTRY   805   27 - 33   2016

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    DOI: 10.1016/J.JORGANCHEM.2015.12.042

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  • Manganese Compounds as Water-Oxidizing Catalysts: From the Natural Water-Oxidizing Complex to Nanosized Manganese Oxide Structures Reviewed International journal

    M. M. Najafpour, G. Renger, M. Holynska, A. N. Moghaddam, E.-M. Aro, R. Carpentier, H. Nishihara, J. J. Eaton-Rye, J.-R. Shen, S. I. Allakhverdiev

    CHEMICAL REVIEWS   116 ( 5 )   2886 - 2936   2016

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    All cyanobacteria, algae, and plants use a similar water-oxidizing catalyst for water oxidation. This catalyst is housed in Photosystem II, a membrane-protein complex that functions as a light-driven water oxidase in oxygenic photosynthesis. Water oxidation is also an important reaction in artificial photosynthesis because it has the potential to provide cheap electrons from water for hydrogen production or for the reduction of carbon dioxide on an industrial scale. The water-oxidizing complex of Photosystem II is a Mn-Ca cluster that oxidizes water with a low overpotential and high turnover frequency number of up to 25-90 molecules of O2 released per second. In this Review, we discuss the atomic structure of the Mn-Ca cluster of the Photosystem II water-oxidizing complex from the viewpoint that the underlying mechanism can be informative when designing artificial water-oxidizing catalysts. This is followed by consideration of functional Mn-based model complexes for water oxidation and the issue of Mn complexes decomposing to Mn oxide. We then provide a detailed assessment of the chemistry of Mn oxides by considering how their bulk and nanoscale properties contribute to their effectiveness as water-oxidizing catalysts.

    DOI: 10.1021/ACS.CHEMREV.5B00340

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  • Electrochemical fabrication of one-dimensional porphyrinic wires on electrodes Reviewed

    S. Mustafar, K.-H. Wu, R. Toyoda, K. Takada, H. Maeda, M. Miyachi, R. Sakamoto, H. Nishihara

    Inorganic Chemistry Frontiers   3 ( 3 )   370 - 375   2016

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    DOI: 10.1039/C5QI00239G

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  • Electron transport of bis(terpyridine)iron(II) complex wires on a semiconducting electrode Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   779   112 - 116   2016

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  • Interfacial Synthesis of Electrically Conducting Palladium Bis(dithiolene) Complex Nanosheet Reviewed

    Tigmansu Pal, Tetsuya Kambe, Tetsuro Kusamoto, Maw Lin Foo, Ryota Matsuoka, Ryota Sakamoto, Hiroshi Nishihara

    CHEMPLUSCHEM   80 ( 8 )   1255 - 1258   2015.8

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    DOI: 10.1002/cplu.201500206

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  • Spin-Reconstructed Proton-Coupled Electron Transfer in a Ferrocene-Nickeladithiolene Hybrid Reviewed

    Akira Tanushi, Tetsuro Kusamoto, Yohei Hattori, Kenji Takada, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 20 )   6448 - 6451   2015.5

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    DOI: 10.1021/jacs.5b02118

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  • A photofunctional bottom-up bis(dipyrrinato)zinc(II) complex nanosheet Reviewed

    Ryota Sakamoto, Ken Hoshiko, Qian Liu, Toshiki Yagi, Tatsuhiro Nagayama, Shinpei Kusaka, Mizuho Tsuchiya, Yasutaka Kitagawa, Wai-Yeung Wong, Hiroshi Nishihara

    NATURE COMMUNICATIONS   6   2015.4

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    DOI: 10.1038/ncomms7713

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  • Electrochromic Bis(terpyridine)metal Complex Nanosheets Reviewed

    Kenji Takada, Ryota Sakamoto, Shi-Ting Yi, Shunsuke Katagiri, Tetsuya Kambe, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 14 )   4681 - 4689   2015.4

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    DOI: 10.1021/ja510788b

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  • Proton-electron dual responsive system of ferrocene-bound nickelladithiolene Reviewed

    Akira Tanushi, Tetsuro Kusamoto, Yohei Hattori, Kenji Takada, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   249   2015.3

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  • Photofunctional Bis(dipyrrinato)zinc(II) complex nanosheet Reviewed

    Ryota Sakamoto, Tatsuhiro Nagayama, Ken Hoshiko, Toshiki Yagi, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   249   2015.3

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  • Meso-N-arylamino- and N,N-diarylaminoporphyrinoids: Syntheses, properties and applications Reviewed

    Ryota Sakamoto, Suzaliza Mustafar, Hiroshi Nishihara

    JOURNAL OF PORPHYRINS AND PHTHALOCYANINES   19 ( 1-3 )   21 - 31   2015.1

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  • Optical Properties of Disilane-Bridged Donor Acceptor Architectures: Strong Effect of Substituents on Fluorescence and Nonlinear Optical Properties Reviewed

    Masaki Shimada, Yoshinori Yamanoi, Tomonori Matsushita, Takashi Kondo, Eiji Nishibori, Akari Hatakeyama, Kunihisa Sugimoto, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 3 )   1024 - 1027   2015.1

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    DOI: 10.1021/ja511177e

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  • Electron Transport Dynamics in Redox-Molecule-Terminated Branched Oligomer Wires on Au(111) Reviewed

    Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Yoshihiko Nishimori, Seiji Miyashita, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   137 ( 2 )   734 - 741   2015.1

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    DOI: 10.1021/ja509470w

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  • Damage management in water-oxidizing catalysts: From Photosystem II to nano-sized metal oxides Reviewed

    M. M. Najafpour, M. Fekete, D. J. Sedigh, E.-M. Aro, R. Carpentier, J. J. Eaton-Rye, H. Nishihara, J.-R. Shen, S. I. Allakhverdiev, L. Spiccia

    ACS Catalysis   5 ( 3 )   1499 - 1512   2015

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  • A single-molecular twin rotor: correlated motion of two pyrimidine rings coordinated to copper Reviewed

    Yusuke Takara, Tetsuro Kusamoto, Tatsuya Masui, Michihiro Nishikawa, Shoko Kume, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   51 ( 14 )   2896 - 2898   2015

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    DOI: 10.1039/c4cc09182e

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  • Heteroleptic bis(dipyrrinato)copper(II) and nickel(II) complexes Reviewed

    Ryojun Toyoda, Mizuho Tsuchiya, Ryota Sakamoto, Ryota Matsuoka, Kuo-Hui Wu, Yohei Hattori, Hiroshi Nishihara

    DALTON TRANSACTIONS   44 ( 34 )   15103 - 15106   2015

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    DOI: 10.1039/c5dt00724k

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  • Synthesis, characterization, and physical properties of oligo(1-(N,N-dimethylamino)pyrrole)s and their doped forms, precursors of candidates for molecular flat-band ferromagnets Reviewed

    Yoshinori Yamanoi, Kazuhiro Takahashi, Takeshi Hamada, Norikazu Ohshima, Masashi Kurashina, Yohei Hattori, Tetsuro Kusamoto, Ryota Sakamoto, Mariko Miyachi, Hiroshi Nishihara

    JOURNAL OF MATERIALS CHEMISTRY C   3 ( 17 )   4316 - 4320   2015

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    DOI: 10.1039/c4tc02941k

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  • Intramolecular Ferromagnetic Radical-CuII Coupling in a CuII Complex Ligated with Pyridyl-Substituted Triarylmethyl Radicals Reviewed

    T. Kusamoto, Y. Hattori, A. Tanushi, H. Nishihara

    INORGANIC CHEMISTRY   54   4186 - 4188   2015

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  • Photobiological hydrogen production and artificial photosynthesis for clean energy: from bio to nanotechnologies Reviewed

    K. Nath, M. M. Najafpour, R. A. Voloshin, S. E. Balaghi, E. Tyystja¨rvi, R. Timilsina, J. J. Eaton-Rye, T. Tomo, H. G. Nam, H. Nishihara, S. Ramakrishna, J.-R. Shen, S. I. Allakhverdiev

    PHOTOSYNTHESIS RESEARCH   126   237 - 247   2015

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    DOI: 10.1007/S11120-015-0139-4

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  • Rapid Electron Transport Phenomenon in the Bis(terpyridine) Metal Complex Wire: Marcus Theory and Electrochemical Impedance Spectroscopy Study Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    Journal of Physical Chemistry Letters   44 ( 19 )   1211 - 1213   2015

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    DOI: 10.1021/ACS.JPCLETT.5B01725

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  • Bis(terpyridine)iron(II) Complex Wires with a Bithiophene Linker for Superior Long Range Electron Transport Reviewed

    A. Bajpayee, H. Maeda, S. Katagiri, R. Sakamoto, H. Nishihara

    CHEMISTRY LETTERS   44 ( 9 )   1211 - 1213   2015

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    DOI: 10.1246/CL.150519

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  • Modulation of Electronic State of π-Conjugated Nickelladithiolene Complex Nanosheet Reviewed

    T. Kambe, T. Kusamoto, R. Sakamoto, H. Nishihara

    Macromol. Symp.   351 ( 1 )   78 - 80   2015

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    DOI: 10.1002/MASY.201300127

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  • Heteroleptic [Bis(oxazoline)](dipyrrinato)zinc(II) Complexes: Bright and Circularly Polarized Luminescence from an Originally Achiral Dipyrrinato Ligand Reviewed

    J, F. Kögel, S. Kusaka, R. Sakamoto, T. Iwashima, M. Tsuchiya, R. Toyoda, R. Matsuoka, T. Tsukamoto, Junpei. Yuasa, Y. Kitagawa, T. Kawai, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   55   1377 - 1381   2015

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    DOI: 10.1039/C5DT00724K

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  • New aspects in bis and tris(dipyrrinato) metal complexes: bright luminescence, self-assembled nanoarchitectures, and materials applications Reviewed

    Ryota Sakamoto, Toshiki Iwashima, Mizuho Tsuchiya, Ryojun Toyoda, Ryota Matsuoka, Julius F. Koegel, Shinpei Kusaka, Ken Hoshiko, Toshiki Yagi, Tatsuhiro Nagayama, Hiroshi Nishihara

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 30 )   15357 - 15371   2015

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  • pi-Conjugated bis(terpyridine) metal complex molecular wires Reviewed

    Ryota Sakamoto, Kuo-Hui Wu, Ryota Matsuoka, Hiroaki Maeda, Hiroshi Nishihara

    CHEMICAL SOCIETY REVIEWS   44 ( 21 )   7698 - 7714   2015

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  • Enhanced Luminescent Properties of an Open-Shell (3,5-Dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl Radical by Coordination to Gold Reviewed

    Y. Hattori, T. Kusamoto, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   54   3731 - 3734   2015

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    DOI: 10.1002/ANIE.201411572

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  • Geometric and Electrochemical Properties of Complexes Consisting of Two Aminonaphthoquinone-bound Schiff-base Ligands and MnII, FeII, NiII, CuII, or ZnII Reviewed

    Y. Hasegawa, H. Nakamura, Y. Hattori, K. Hoshiko, T. Kusamoto, M. Murata, S. Kume, H. Nishihara

    POLYHEDRON   86   111 - 119   2015

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    DOI: 10.1016/J.POLY.2014.06.015

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  • Preparation of Pd Nanoparticles with Tetrahedral, Spherical, Plate, and Feather Shapes by Capping with 1-Pentyl Isocyanide Reviewed

    M. Miyachi, Y. Yamamoto, Y. Yamanoi, H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   25 ( 1 )   140 - 144   2015

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    DOI: 10.1007/S10904-014-0121-1

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  • Highly photostable luminescent open-shell (3,5-dihalo-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radicals: significant effects of halogen atoms on their photophysical and photochemical properties Reviewed

    Y. Hattori, T. Kusamoto, H. Nishihara

    RSC Advances   5   64802 - 64805   2015

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    DOI: 10.1039/C5RA14268G

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  • Bis(dipyrrinato)metal(II) coordination polymers: Crystallization, exfoliation into single wires, and electric conversion ability Reviewed

    R. Matsuoka, R. Toyoda, R. Sakamoto, M. Tsuchiya, K. Hoshiko, T. Nagayama, Y. Nonoguchi, K. Sugimoto, E. Nishibori, T. Kawai, H. Nishihara

    Chemical Science   6 ( 5 )   2853 - 2858   2015

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    DOI: 10.1039/C5SC00273G

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  • Redox Control and High Conductivity of Nickel Bis(dithiolene) Complex pi-Nanosheet: A Potential Organic Two-Dimensional Topological Insulator Reviewed

    Tetsuya Kambe, Ryota Sakamoto, Tetsuro Kusamoto, Tigmansu Pal, Naoya Fukui, Ken Hoshiko, Takahiro Shimojima, Zhengfei Wang, Toru Hirahara, Kyoko Ishizaka, Shuji Hasegawa, Feng Liu, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136 ( 41 )   14357 - 14360   2014.10

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    DOI: 10.1021/ja507619d

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  • Reactivity and Electronic Properties of a Ferrocene Molecule Bearing an N,C-Chelated BMes(2) Unit Reviewed

    Ying-Li Rao, Tetsuro Kusamoto, Ryota Sakamoto, Hiroshi Nishihara, Suning Wang

    ORGANOMETALLICS   33 ( 7 )   1787 - 1793   2014.4

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    DOI: 10.1021/om500138f

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  • Synthesis and Hydrogen Storage Properties of Palladium Nanoparticle-Organic Frameworks Reviewed

    Yuki Yamamoto, Mariko Miyachi, Yoshinori Yamanoi, Ai Minoda, Shunsuke Maekawa, Shinji Oshima, Yoshihiro Kobori, Hiroshi Nishihara

    JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS   24 ( 1 )   208 - 213   2014.1

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    DOI: 10.1007/s10904-013-9925-7

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  • Coordination Programming - A Concept for the Creation of Multifunctional Molecular Systems Reviewed

    H. Nishihara

    CHEMISTRY LETTERS   43 ( 4 )   388 - 395   2014

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    Coordination programming is a recently proposed method of creating superstructures that utilizes the advantages of coordination chemistry to control chemical bonds and the arrangements of metal atoms and ions. This review summarizes the recent advances of research on this concept, which are roughly divided into four categories: interfacial programming for molecular circuit systems, cluster programming for systems with electromagnetic functions, supramolecular programming for energy and chemical conversion, and bio-inspired programming for functionalized soft materials.

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  • Crystal structure of (Z )-1-(ferrocenylethynyl)-10-(phenylimino) anthracen-9(10H)-one from synchrotron X-ray powder diffraction Reviewed

    E. Nishibori, S. Aoyagi, M. Sakata, R. Sakamoto, H. Nishihara

    Acta Crystallographica Section E-Crystallographic Communications   70 ( 12 )   573 - 576   2014

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    In the title compound, [Fe(C5H5)(C27H16NO)], designed and synthesized to explore a new electron-donor (<italic>D</italic>) and -acceptor (<italic>A</italic>) conjugated complex, the two cyclopentadienyl rings adopt an eclipsed conformation. The anthracene tricycle is distorted towards a butterfly conformation and the mean planes of the outer benzene rings are inclined each to other at 22.7 (3)°. In the crystal, molecules are paired into inversion dimers<italic>via</italic>π–π interactions. Weak intermolecular C—H...π interactions link further these dimers into one-dimensional columns along the<italic>b</italic>axis, with the ferrocenylethynyl arms arranged between the stacks to fill the voids.

    DOI: 10.1107/S1600536814025252

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  • π-Conjugation modification of photochromic and redox-active dimethyldihydropyrene by phenyl- and ethynyl-terpyridines and Ru(bis-terpyridine) complexes Reviewed

    S. Muratsugu, H. Nishihara

    NEW JOURNAL OF CHEMISTRY   38   6114 - 6124   2014

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    DOI: 10.1039/C4NJ01462F

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  • Luminescence, Stability, and Proton Response of an Open-Shell (3,5-Dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl Radical Reviewed

    Y. Hattori, T. Kusamoto, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   53   11845 - 11848   2014

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    DOI: 10.1002/ANIE.201407362

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  • Ordered Alignment of a One-Dimensional π-Conjugated Nickel Bis(dithiolene) Complex Polymer Produced via a Liquid-Liquid Interfacial Reaction Reviewed

    R. Matsuoka, R. Sakamoto, T. Kusamoto, T. Kambe, K. Takada, H. Nishihara

    CHEMICAL COMMUNICATIONS   50 ( 60 )   8137 - 8139   2014

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    DOI: 10.1039/C4CC02022G

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  • Surface-Junction Effects on Interfacial Electron Transfer between Bis(terpyridine)iron(II) and Hydrogen-Terminated Silicon(111) Electrode Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   20 ( 10 )   2761 - 2764   2014

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    DOI: 10.1002/CHEM.201304588

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  • Fabrication of Dense and multi-layered films of The Nickel Bis(dithiolene) Nanosheet By Means of The Langmuir–Schäefer Method Reviewed

    K. Hoshiko, T. Kambe, R. Sakamoto, K. Takada, H. Nishihara

    CHEMISTRY LETTERS   42   252 - 253   2014

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    DOI: 10.1002/CHEM.201304588

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  • Structures and Optical Properties of Tris(trimethylsilyl)silylated Oligothiophene Derivatives Reviewed International journal

    H. Inubushi, Y. Hattori, Y. Yamanoi, H. Nishihara

    JOURNAL OF ORGANIC CHEMISTRY   79 ( 7 )   2974 - 2979   2014

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    The structures and optical properties of tris(trimethylsilyl)silylated oligothiophenes were examined by spectroscopies, theoretical calculations, and single-crystal X-ray measurements. Bathochromic shift from the original oligothiophenes was observed in the tris(trimethylsilyl)silylated ones, confirming the σ-π conjugation between Si-Si σ bonds and π-orbital. 5,5'-Bis(tris(trimethylsilyl)silyl)-2,2'-bithiophene (Si-T2) showed the highest fluorescence quantum yield (ΦF) both in solution (0.67, excited at 350 nm) and the solid state (0.74, excited at 371 nm). The introduction of tris(trimethylsilyl)silyl groups led to the small nonradiative rate constant of Si-T2, resulting in the high ΦF in the solution state. Si-T2 also exhibited effective σ-π conjugation and poor molecular interaction, which reflected its high ΦF in the solid state. On the contrary, lower ΦF (0.13, excited at 331 nm) in the solid state was observed in the longest oligothiophene examined, 5,5‴-bis(1,1,1,3,3,3-hexamethyl-2-(trimethylsilyl)trisilan-2-yl)-2,2':5',2″:5″,2‴-quaterthiophene (Si-T4). Single-crystal X-ray measurement clarified that this compound adopted a zigzag packing structure and a rare syn-anti-syn conformation, which led to the poor σ-π conjugation and the decrease of π-orbital overlap in the solid state.

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  • Photo-electric Signal Conversion by Combination of Electron-transfer-chain Catalytic Isomerization and Photoisomerization on Benzodimethyldihydropyrenes Reviewed

    M. Kishida, T. Kusamoto, H. Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   136   1787 - 1793   2014

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    DOI: 10.1021/JA412528D

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  • Luminescent Heteroleptic Tris(dipyrrinato)In(III) complexes Reviewed

    S. Kusaka, R. Sakamoto, H. Nishihara

    INORGANIC CHEMISTRY   53   3275 - 3277   2014

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    DOI: 10.1021/IC500326U

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  • Regulation of the Rate of Dinucleation of a Mono-Copper(I) Complex Containing Bipyrimidine Rotary Units by Restricted Double Pyrimidine Rotation Reviewed

    Y. Hattori, M. Nishikawa, T. Kusamoto, S. Kume, H. Nishihara

    INORGANIC CHEMISTRY   53   2831 - 2840   2014

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    DOI: 10.1021/IC500074C

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  • Water exchange in manganese-based water-oxidizing catalysts in photosynthetic systems: From the water-oxidizing complex in photosystem II to nano-sized manganese oxides Reviewed International journal

    M. M. Najafpour, M. A. Isaloo, J. J. Eaton-Rye, T. Tomo, H. Nishihara, K. Satoh, R. Carpentier, J.-R. Shen, S. I. Allakhverdiev

    BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS   1837 ( 9 )   1395 - 1410   2014

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    The water-oxidizing complex (WOC), also known as the oxygen-evolving complex (OEC), of photosystem II in oxygenic photosynthetic organisms efficiently catalyzes water oxidation. It is, therefore, responsible for the presence of oxygen in the Earth's atmosphere. The WOC is a manganese-calcium (Mn₄CaO₅(H₂O)₄) cluster housed in a protein complex. In this review, we focus on water exchange chemistry of metal hydrates and discuss the mechanisms and factors affecting this chemical process. Further, water exchange rates for both the biological cofactor and synthetic manganese water splitting are discussed. The importance of fully unveiling the water exchange mechanism to understand the chemistry of water oxidation is also emphasized here. This article is part of a special issue entitled: photosynthesis research for sustainability: keys to produce clean energy.

    DOI: 10.1016/J.BBABIO.2014.03.008

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  • Bio-inspired photoresponse of porphyrin-attached gold nanoparticles on a field-effect transistor Reviewed International journal

    M. Miyachi, Y. Yamanoi, K. Nakazato, H. Nishihara

    BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS   1837 ( 9 )   1567 - 1571   2014

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    A bio-inspired photoresponse was engineered in porphyrin-attached Au nanoparticles (AuNPs) on a field-effect transistor (FET). The system mimics photosynthetic electron transfer, using porphyrin derivatives as photosensitizers and AuNPs as photoelectron counting devices. Porphyrin-protected AuNPs were immobilized onto the gate of an FET via the formation of self-assembled monolayers. Photoinduced electron transfer from the porphyrin led to single electron transfer at the Au nanoparticles, which was monitored via a changing gate voltage on the FET in the presence of organic electrolyte. The further attachment of other functional molecules to this system should enable various other potential functionalities. This article is part of a special issue entitled: photosynthesis research for sustainability: keys to produce clean energy.

    DOI: 10.1016/J.BBABIO.2013.11.012

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  • Steric Interference on the Redox-Conjugated Pyrimidine Ring Rotation of Mono- and Di-nuclear Copper Complexes with (4-Methyl-2-pyrimidinyl)imine Ligands Reviewed

    Y. Hattori, M. Nishikawa, T. Kusamoto, S. Kume, H. Nishihara

    CHEMISTRY LETTERS   43 ( 7 )   1037 - 1039   2014

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    A mononuclear copper(I) complex with N-[(4-methyl-2-pyrimidinyl)methylene]-p-toluidine (1·BF4) and a dinuclear copper(I) complex with N,N′-bis[(4-methyl-2-pyrimidinyl)methylene]-p-phenylenediamine (2·(BF4)2) were synthesized as BF4 salts to evaluate the influence of the imine moiety on the pyrimidine ring rotation isomerism. 1·BF4 existed in solution as a mixture of two isomers; 2·(BF4)2 was present as a mixture of three isomers. The redox potentials of the copper centers were changed by pyrimidine ring rotation. Comparison of 1+ and 22+ indicated that increasing the steric congestion around the copper center increased the o/i isomer ratio; the redox potentials of both the o- and i-isomers shifted in the positive direction, and the CuII/I redox reaction became slower.

    DOI: 10.1246/CL.140238

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  • Asymmetric dinuclear bis(dipyrrinato)zinc(II) complexes: broad absorption and unidirectional quantitative exciton transmission Reviewed

    Mizuho Tsuchiya, Ryota Sakamoto, Shinpei Kusaka, Yasutaka Kitagawa, Mitsutaka Okumura, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   50 ( 44 )   5881 - 5883   2014

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    DOI: 10.1039/c4cc01573h

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  • Equatorenes: Synthesis and Properties of Chiral Naphthalene, Phenanthrene, Chrysene, and Pyrene Possessing Bis(1-adamantyl) Groups at the Peri-position Reviewed

    Koji Yamamoto, Naohiro Oyamada, Sheng Xia, Yuta Kobayashi, Masahiko Yamaguchi, Hiroaki Maeda, Hiroshi Nishihara, Tadafumi Uchimaru, Eunsang Kwon

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   135 ( 44 )   16526 - 16532   2013.11

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    DOI: 10.1021/ja407800e

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  • pi-Conjugated Trinuclear Group-9 Metalladithiolenes with a Triphenylene Backbone Reviewed

    Ryota Sakamoto, Tetsuya Kambe, Satoru Tsukada, Kenji Takada, Ken Hoshiko, Yasutaka Kitagawa, Mitsutaka Okumura, Hiroshi Nishihara

    INORGANIC CHEMISTRY   52 ( 13 )   7411 - 7416   2013.7

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    DOI: 10.1021/ic400110z

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  • Nanoparticle Assemblies via Coordination with a Tetrakis(terpyridine) Linker Bearing a Rigid Tetrahedral Core Reviewed

    Yoshinori Yamanoi, Yuki Yamamoto, Mariko Miyachi, Masaki Shimada, Ai Minoda, Shinji Oshima, Yoshihiro Kobori, Hiroshi Nishihara

    LANGMUIR   29 ( 28 )   8768 - 8772   2013.7

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    DOI: 10.1021/la401896d

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  • 1,4-Bis[2-(4-ferrocenylphenyl)ethynyl]anthraquinone from synchrotron X-ray powder diffraction Reviewed

    Maki Sachiko, Eiji Nishibori, Shinobu Aoyagi, Makoto Sakata, Masaki Takata, Mio Kondo, Masaki Murata, Ryota Sakamoto, Hiroshi Nishihara

    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS   69   696 - +   2013.7

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    DOI: 10.1107/S0108270113013978

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  • Cyclodextrin-supported organic matrix for application of MALDI-MS for forensics. Soft-ionization to obtain protonated molecules of low molecular weight compounds Reviewed

    Tetsu Yonezawa, Takashi Asano, Tatsuya Fujino, Hiroshi Nishihara

    CHEMICAL PHYSICS   419   17 - 22   2013.6

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    DOI: 10.1016/j.chemphys.2012.10.003

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  • Triarylamine-conjugated Bis(terpyridine)-Iron(II) Complex Wires: Rapid and Long-range Electron-transport Ability Reviewed

    Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Hiroshi Nishihara

    CHEMISTRY LETTERS   42 ( 5 )   553 - 555   2013.5

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    DOI: 10.1246/cl.130083

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  • Triarylamine-Conjugated Bis(dipyrrinato)zinc(II) Complexes: Impact of Triarylamine on Photochemical Property and Multi-Redox Reaction Reviewed

    Mizuho Tsuchiya, Ryota Sakamoto, Shinpei Kusaka, Junko Kakinuma, Hiroshi Nishihara

    ELECTROCHEMISTRY   81 ( 5 )   337 - 339   2013.5

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    DOI: 10.5796/electrochemistry.81.337

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  • Bis(terpyridine) metal complex wires: Excellent long-range electron transfer ability and controllable intrawire redox conduction on silicon electrode Reviewed

    Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Hiroshi Nishihara

    COORDINATION CHEMISTRY REVIEWS   257 ( 9-10 )   1493 - 1506   2013.5

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  • Synthesis of Diazenido-Ligated Vanadium Nanoparticles Reviewed

    Mariko Miyachi, Yuki Yamamoto, Yoshinori Yamanoi, Ai Minoda, Shinji Oshima, Yoshihiro Kobori, Hiroshi Nishihara

    LANGMUIR   29 ( 17 )   5099 - 5103   2013.4

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    DOI: 10.1021/la400102q

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  • Coordination Programming of Photofunctional Molecules Reviewed

    Ryota Sakamoto, Shinpei Kusaka, Mikihiro Hayashi, Michihiro Nishikawa, Hiroshi Nishihara

    MOLECULES   18 ( 4 )   4091 - 4119   2013.4

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  • Two-way Linkage Photoisomerization of [Ru(2,2 ':6 ',2 ''-terpyridine)(6-{(methylsulfinyl)methyl}picolinate)BF4 Reviewed

    Shoko Suzuki, Ryota Sakamoto, Hiroshi Nishihara

    CHEMISTRY LETTERS   42 ( 1 )   17 - 18   2013.1

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    DOI: 10.1246/cl.2013.17

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  • A bis(terpyridine)iron network polymer on carbon for a potential energy storage material Reviewed

    Kuo-Hui Wu, Hiroaki Maeda, Tetsuya Kambe, Ken Hoshiko, Eunice Jia Han Phua, Ryota Sakamoto, Hiroshi Nishihara

    DALTON TRANSACTIONS   42 ( 45 )   15877 - 15880   2013

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  • Stimuli-Responsive Pyrimidine Ring Rotation in Copper Complexes for Switching Their Physical Properties Reviewed

    M. Nishikawa, S. Kume, H. Nishihara

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   15   10549 - 10565   2013

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    DOI: 10.1039/C3CP44710C

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  • Substituent-Dependent Spin-Density Distribution and Coexistence of Fe 3d and π Spins on Ferrocene-Tetrathiafulvalene Hybrids Reviewed

    T. Kusamoto, H. Nishihara, R. Kato

    INORGANIC CHEMISTRY   52   13809 - 13811   2013

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    DOI: 10.1021/ic4022678

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  • Orthogonal bis(terpyridine)-Fe(II) metal complex oligomer wires on a tripodal scaffold: rapid electron transport Reviewed

    Ryota Sakamoto, Yuuki Ohirabaru, Ryota Matsuoka, Hiroaki Maeda, Shunsuke Katagiri, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   49 ( 64 )   7108 - 7110   2013

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    DOI: 10.1039/c3cc42478b

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  • Bis(E-2,6-di(1-H-pyrazol-1-yl)-4-styrylpyridine)iron(II) Complex: Relationship Between Thermal Spin Crossover and Crystal Solvent Reviewed

    Y. Hasegawa, R. Sakamoto, K. Takahashi, H. Nishihara

    INORGANIC CHEMISTRY   52   1658 - 1665   2013

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    DOI: 10.1021/IC302640M

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  • Solvated-Ion-Pairing-Sensitive Molecular Bistability Based on Cu(I)-Coordinated Pyrimidine Ring Rotation Reviewed

    M. Nishikawa, K. Nomoto, S. Kume, H. Nishihara

    INORGANIC CHEMISTRY   52   369 - 380   2013

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    DOI: 10.1021/IC302141Z

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  • Direct synthesis of alkylsilanes by platinum-catalyzed coupling of hydrosilanes and iodoalkanes Reviewed

    H. Inubushi, H. Kondo, A. Lesbani, M. Miyachi, Y. Yamanoi, H. Nishihara

    CHEMICAL COMMUNICATIONS   49   134 - 136   2013

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    DOI: 10.1021/IC302141Z

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  • Structural Modification on Copper(I)-pyridylpyrimidine Complexes for Modulation of Rotational Dynamics, Redox Properties, and Photo-triggered Isomerization Reviewed

    M. Nishikawa, Y. Takara, Y. Hattori, K. Nomoto, T. Kusamoto, S. Kume, H. Nishihara

    INORGANIC CHEMISTRY   52   8962 - 8970   2013

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    DOI: 10.1039/C3CC42478B

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  • π-Conjugated Metalladithiolene Complexes: Developments toward New Dimensions

    KUSAMOTO Tetsuro, KAMBE Tetsuya, NISHIHARA Hiroshi

    X-RAYS   55 ( 6 )   323 - 330   2013

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    The development of functional metalladithiolene complexes was described. Photo-, magneto-, and electro-functional moieties were hybridized with a metalladithiolene backbone to produce novel electronic properties, such as photo-controlled three-state switching, and a SOMO-HOMO converted electronic structure. Long range electronic communication and three-dimensional clusterization were achieved on triangular trinuclear metalladithiolene complexes. The atomiclayer nickel dithiolene nanosheet was successfully prepared, in which nickel bis(dithiolene)moieties were connected through benzene skeletons to form a fully π-conjugated hexagonal structure in two dimensions. The electric properties of the stacked nanosheets were modulated by chemical redox reaction.

    DOI: 10.5940/jcrsj.55.323

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  • Comparative Study of Photochromic Ferrocene-conjugated Dimethyldihydropyrene Derivatives Reviewed

    S. Muratsugu, M. Kishida, R. Sakamoto, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   19   17314 - 17327   2013

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    DOI: 10.1002/CHEM.201303456

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  • Pd-catalyzed Synthesis of Symmetrical and Unsymmetrical Siloxanes Reviewed International journal

    Y. Kurihara, Y. Yamanoi, H. Nishihara

    CHEMICAL COMMUNICATIONS   49 ( 96 )   11275 - 11277   2013

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    A palladium-catalyzed arylation of hydrosiloxanes was developed for the synthesis of symmetrical and unsymmetrical siloxanes. Reactive functional moieties such as hydroxy or cyano groups were able to tolerate the reaction conditions and several novel unsymmetrical siloxanes were synthesized in moderate to high yield.

    DOI: 10.1039/C3CC46294C

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  • Terminal Redox Site Effect on the Long-Range Electron Conduction of Fe(tpy)2 Oligomer Wires on Gold Electrode Reviewed

    S. Katagiri, R. Sakamoto, H. Maeda, Y. Nishimori, T. Kurita, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   19 ( 16 )   5088 - 5096   2013

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    DOI: 10.1002/CHEM.201203913

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  • Metal Complex Oligomer and Polymer Wires on Electrodes: Tactical Constructions and Versatile Functionalities Reviewed

    H. Maeda, R. Sakamoto, H. Nishihara

    POLYMER   54 ( 17 )   4383 - 4403   2013

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    DOI: 10.1016/J.POLYMER.2013.04.019

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  • Efficient Electronic Communication in 4,9-Bis(ferrocenylethynyl)dimethyldihydropyrene Reviewed

    M. Kishida, S. Muratsugu, R. Sakamoto, T. Kusamoto, H. Nishihara

    CHEMISTRY LETTERS   42 ( 4 )   361 - 362   2013

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    We have prepared the dimethyldihydropyrene (DHP) derivative 2, which possesses two ferrocenyl groups at the 4- and 9-positions through ethynylene linkers. 2 shows intense electronic communication between the two ferrocenyl groups, which is promoted by the highly developed π orbital of the diethynyl DHP moiety.

    DOI: 10.1246/CL.121264

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  • meso-Alkynyl BODIPYs: Structure, Photoproperty, π-Extension, and Manipulation of Frontier Orbitals Reviewed

    S. Kusaka, R. Sakamoto, Y. Kitagawa, M. Okumura, H. Nishihara

    Chemistry-An Asian Journal   8 ( 4 )   723 - 727   2013

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    DOI: 10.1002/ASIA.201201176

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  • Synthesis of optically active tertiary silanes via Pd-catalyzed enantioselective arylation of secondary silanes Reviewed

    Yu Kurihara, Michihiro Nishikawa, Yoshinori Yamanoi, Hiroshi Nishihara

    Chemical Communications   48 ( 94 )   11564 - 11566   2012.12

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    DOI: 10.1039/c2cc36238d

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  • A New Method To Generate Arene-Terminated Si(111) and Ge(111) Surfaces via a Palladium-Catalyzed Arylation Reaction Reviewed

    Yoshinori Yamanoi, Junya Sendo, Tetsuhiro Kobayashi, Hiroaki Maeda, Yusuke Yabusaki, Mariko Miyachi, Ryota Sakamoto, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   134 ( 50 )   20433 - 20439   2012.12

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    DOI: 10.1021/ja308606t

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  • Reversible copper(II)/(I) electrochemical potential switching driven by visible light-induced coordinated ring rotation Reviewed

    Michihiro Nishikawa, Kuniharu Nomoto, Shoko Kume, Hiroshi Nishihara

    Journal of the American Chemical Society   134 ( 25 )   10543 - 10553   2012.6

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    DOI: 10.1021/ja3028873

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  • Enhanced photocurrent production by photosystem I with modified viologen derivatives Reviewed

    Yoshinori Yamanoi, Nao Terasaki, Mariko Miyachi, Yasunori Inoue, Hiroshi Nishihara

    THIN SOLID FILMS   520 ( 16 )   5123 - 5127   2012.6

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  • Solid-State Ligand-Driven Light-Induced Spin Change at Ambient Temperatures in Bis(dipyrazolylstyrylpyridine)iron(II) Complexes Reviewed

    Kazuhiro Takahashi, Yuta Hasegawa, Ryota Sakamoto, Michihiro Nishikawa, Shoko Kume, Eiji Nishibori, Hiroshi Nishihara

    INORGANIC CHEMISTRY   51 ( 9 )   5188 - 5198   2012.5

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    DOI: 10.1021/ic300030b

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  • Benzenedithiolate-bridged Rh2W and RhW Cluster Complexes: Synthesis, Properties, and Formation Mechanism Reviewed

    Satoru Tsukada, Ryota Sakamoto, Hiroshi Nishihara

    CHEMISTRY LETTERS   41 ( 4 )   357 - 359   2012.4

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    DOI: 10.1246/cl.2012.357

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  • Ir3Co6 and Co3Fe3 Dithiolene Cluster Complexes: Multiple Metal-Metal Bond Formation and Correlation between Structure and Internuclear Electronic Communication Reviewed

    Satoru Tsukada, Yusuke Shibata, Ryota Sakamoto, Tetsuya Kambe, Tomoji Ozeki, Hiroshi Nishihara

    INORGANIC CHEMISTRY   51 ( 3 )   1228 - 1230   2012.2

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    DOI: 10.1021/ic202548g

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  • Synthesis and Electron Transfer Properties of Metal Complex Oligomer Wires with an Inherent Potential Gradient on Gold Electrode Reviewed

    Y. Nishimori, H. Maeda, S. Katagiri, J. Sendo, M. Miyachi, R. Sakamoto, Y. Yamanoi, H. Nishihara

    Macromol. Symp.   317-318 ( 1 )   276 - 285   2012

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    DOI: 10.1002/MASY.201200016

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  • Extremely Efficient and Reversible Visible-Light Photochromism and Accompanying Switch of Electronic Communication in Phenylcarbazole-Appended Diethynylethene Reviewed International journal

    M. Hayashi, R. Sakamoto, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   18 ( 28 )   8610 - 8613   2012

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    DOI: 10.1002/CHEM.201200794

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  • Photoactive Multinuclear Metal-Containing Polymeric Systems Reviewed

    R. Sakamoto, H. Nishihara

    RSC Polymer Chemistry Series: MOLECULAR DESIGN AND APPLICATIONS OF PHOTOFUNCTIONAL POLYMERS AND MATERIALS   ( 2 )   199 - 244   2012

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    DOI: 10.1039/9781849735766-00199

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  • Synthesis and antibacterial properties of water-dispersible silver nanoparticles stabilized by metal-carbon σ-bonds Reviewed

    K. Kawai, T. Narushima, K. Kaneko, H. Kawakami, M. Matsumoto, A. Hyono, H. Nishihara, T. Yonezawa

    APPLIED SURFACE SCIENCE   262   76 - 80   2012

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    DOI: 10.1016/J.APSUSC.2012.02.018

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  • Ferrocene-dithiolene hybrids: control of strong donor-acceptor electronic communication to reverse the charge transfer direction Reviewed

    T. Kusamoto, K. Takada, R. Sakamoto, S. Kume, H. Nishihara

    INORGANIC CHEMISTRY   51   12102 - 12113   2012

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    DOI: 10.1021/IC300581A

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  • Solubilization of a π-Conjugating Hydrophobic Dendrimer in Aqueous Media Reviewed International journal

    T. Imaoka, M. Katsurayama, Y. Yamanoi, H. Nishihara, K. Yamamoto

    MACROMOLECULAR RAPID COMMUNICATIONS   33 ( 8 )   683 - 687   2012

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    Phenylazomethine dendrimers, which can be used as the template for precise metal nanoparticles, are soluble only in aprotic media. The use of a specific surfactant enabled their solubilization in aqueous solutions. Under dilute condition, they formed discrete micelles with a size close to the that of the dendrimer. Condensation resulted in their aggregation; however, they remained in a homogeneous solution without precipitation. Furthermore, each micelle was well isolated. The triplet-excited state of the zinc porphyrin core in the micelles was significantly stable, suggesting the formation of rigid core-shell micelles preventing any external molecules from approaching to the core.

    DOI: 10.1002/MARC.201100740

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  • Multinuclear metalladithiolenes: focusing on electronic communication in mixed-valent states Reviewed

    Ryota Sakamoto, Satoru Tsukada, Hiroshi Nishihara

    DALTON TRANSACTIONS   41 ( 34 )   10123 - 10135   2012

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    DOI: 10.1039/c2dt30787a

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  • Fluorescent azadipyrrinato zinc(II) complex: hybridisation with a dipyrrinato ligand Reviewed

    Ryota Sakamoto, Shinpei Kusaka, Yasutaka Kitagawa, Masa-aki Kishida, Mikihiro Hayashi, Yusuke Takara, Mizuho Tsuchiya, Junko Kakinuma, Takuma Takeda, Keisuke Hirata, Tomoya Ogino, Keisuke Kawahara, Toshiki Yagi, Shu Ikehira, Tomoya Nakamura, Mayuko Isomura, Mikoto Toyama, Saki Ichikawa, Mitsutaka Okumura, Hiroshi Nishihara

    DALTON TRANSACTIONS   41 ( 46 )   14035 - 14037   2012

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    DOI: 10.1039/c2dt32039h

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  • An Extremely Bright Heteroleptic Bis(dipyrrinato)zinc(II) Complex Reviewed

    S. Kusaka, R. Sakamoto, Y. Kitagawa, M. Okumura, H. Nishihara

    Chemistry-An Asian Journal   7 ( 5 )   907 - 910   2012

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    DOI: 10.1002/ASIA.201200131

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  • Protonation-induced Cyclization of 1,8-Bis(arylethynyl)anthraquinones: Monopyrylium Salt Formation and Intensification of Donor-Acceptor Interaction Reviewed

    Koya Prabhakara Rao, Mio Kondo, Ryota Sakamoto, Tetsuro Kusamoto, Shoko Kume, Hiroshi Nishihara

    CHEMISTRY LETTERS   40 ( 12 )   1456 - 1458   2011.12

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    DOI: 10.1246/cl.2011.1456

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  • Arylethynylanthraquinone and Bis(arylethynyl)anthraquinone: Strong Donor-Acceptor Interaction and Proton-induced Cyclization to Form Pyrylium and Dipyrylium Salts Reviewed

    Ryota Sakamoto, Koya Prabhakara Rao, Hiroshi Nishihara

    CHEMISTRY LETTERS   40 ( 12 )   1316 - 1326   2011.12

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  • Synthesis of vanadium-doped palladium nanoparticles for hydrogen storage materials Reviewed

    Yuki Yamamoto, Mariko Miyachi, Yoshinori Yamanoi, Ai Minoda, Shunsuke Maekawa, Shinji Oshima, Yoshihiro Kobori, Hiroshi Nishihara

    JOURNAL OF NANOPARTICLE RESEARCH   13 ( 12 )   6333 - 6338   2011.12

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    DOI: 10.1007/s11051-011-0628-0

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  • Benzo[e]pyrene Skeleton Dipyrylium Dication with a Strong Donor-Acceptor-Donor Interaction, and Its Two-Electron Reduced Molecule Reviewed

    Koya Prabhakara Rao, Mio Kondo, Ryota Sakamoto, Tetsuro Kusamoto, Michihiro Nishikawa, Shoko Kume, Masayuki Nihei, Hiroki Oshio, Hiroshi Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   17 ( 50 )   14010 - 14019   2011.12

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    DOI: 10.1002/chem.201101708

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  • Electrochemical Analysis of Metal Complex Wires and Their Long-range Electron Transport Properties

    MAEDA Hiroaki, SAKAMOTO Ryota, NISHIHARA Hiroshi

    J. Surf. Sci. Soc. Jpn.   32 ( 10 )   641 - 646   2011.10

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    The bottom-up methods have recently attracted much attention as the fabrication techniques of nanoscale devices. Self-assembled monolayer (SAM) can be a basis to construct nanoscale structures, and many researchers have challenged to fabricate multilayer systems with self assembly. Among a variety of the preparation methods of self-assembled multilayer structures, the stepwise coordination is one of the most attractive methods because it allows us to construct complex oligomer wires quantitatively and regularly using very simple processes. Our main research targets are the fabrication of π-conjugated bis(terpyridine) complex oligomer wires and their electron transport properties. Linear and branched wires were constructed by the stepwise coordination method, and their electron transport mechanism was analyzed by potential-step chronoamperometry. Additionally, it was found that bis(terpyridine) complex oligomer wires have the excellent long-range electron transport ability and we can control it by changing combination of surface anchoring molecules, metal ions and bridging ligands.

    DOI: 10.1380/jsssj.32.641

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  • Double lactonization in triarylamine-conjugated dimethyl diethynylfumarate: Formation of intensely colored and luminescent quadrupolar molecules including a missing structural isomer of Pechmann dyes Reviewed

    Mikihiro Hayashi, Fumiyuki Toshimitsu, Ryota Sakamoto, Hiroshi Nishihara

    Journal of the American Chemical Society   133 ( 37 )   14518 - 14521   2011.9

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    DOI: 10.1021/ja2054176

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  • Expanding family of π-conjugated trinuclear dithiolenes: The cases of group 8 (RuII) and 10 (NiII and PtII) metals Reviewed

    Tetsuya Kambe, Satoru Tsukada, Ryota Sakamoto, Hiroshi Nishihara

    Inorganic Chemistry   50 ( 15 )   6856 - 6858   2011.8

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    DOI: 10.1021/ic200766p

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  • Preferential carbene insertion into Ge-H vs. other heavier group 14 hydrides via samarium carbenoids Reviewed

    Hitoshi Kondo, Yoshinori Yamanoi, Hiroshi Nishihara

    Chemical Communications   47 ( 23 )   6671 - 6673   2011.6

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    DOI: 10.1039/c1cc11256b

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  • Reversible On/Off Conductance Switching of Single Diarylethene Immobilized on a Silicon Surface Reviewed

    Kazuki Uchida, Yoshinori Yamanoi, Tetsu Yonezawa, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   133 ( 24 )   9239 - 9241   2011.6

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    DOI: 10.1021/ja203269t

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  • Switching of Molecular Insertion in a Cyclic Molecule via Photo- and Thermal Isomerization Reviewed

    Satoshi Umeki, Shoko Kume, Hiroshi Nishihara

    INORGANIC CHEMISTRY   50 ( 11 )   4925 - 4933   2011.6

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    DOI: 10.1021/ic200145h

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  • Tuning-up and driving a redox-active rotor Reviewed

    Shoko Kume, Hiroshi Nishihara

    Chemical Communications   47 ( 1 )   415 - 417   2011.1

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    DOI: 10.1039/c0cc02193h

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  • Synthesis, structure and magnetic behavior of new 1D metal-organic coordination polymer with Fe3O core Reviewed

    Maxim P. Yutkin, Marina S. Zavakhina, Alexander V. Virovets, Danil N. Dybtsev, Vladimir P. Fedin, Tetsuro Kusamoto, Hiroshi Nishihara

    INORGANICA CHIMICA ACTA   365 ( 1 )   513 - 516   2011.1

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    DOI: 10.1016/j.ica.2010.10.015

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  • Complete solid state photoisomerization of bis(dipyrazolylstyrylpyridine) iron(ii) to change magnetic properties Reviewed

    Yuta Hasegawa, Kazuhiro Takahashi, Shoko Kume, Hiroshi Nishihara

    Chemical Communications   47 ( 24 )   6846 - 6848   2011

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    DOI: 10.1039/c1cc11850a

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  • Platinadithiolene-conjugated pyrylium salt with strong intramolecular donor-acceptor interaction Reviewed

    Koya Prabhakara Rao, Tetsuro Kusamoto, Ryota Sakamoto, Yuki Yamamoto, Shoko Kume, Masayuki Nihei, Hiroki Oshio, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   47 ( 8 )   2330 - 2332   2011

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    DOI: 10.1039/c0cc04762g

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  • Preparation of Optical Resins Containing Dispersed Gold Nanoparticles by the Matrix Sputtering Method Reviewed

    Yuichi Shishino, Tetsu Yonezawa, Satoshi Udagawa, Kaname Hase, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   50 ( 3 )   703 - 705   2011

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    DOI: 10.1002/anie.201005723

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  • A Uniform Bimetallic Rhodium/Iron Nanoparticle Catalyst for the Hydrogenation of Olefins and Nitroarenes Reviewed International journal

    I. Nakamula, Y. Yamanoi, T. Imaoka, K. Yamamoto, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   50 ( 26 )   5830 - 5833   2011

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    DOI: 10.1002/ANIE.201102836

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  • Synchronized motion and electron transfer of a redox-active rotor Reviewed

    S. Kume, H. Nishihara

    DALTON TRANSACTIONS   40   2299 - 2305   2011

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    DOI: 10.1039/C0DT01084G

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  • Normal and inverted redox potentials and structural changes tuned by medium effects in [M2Mo(5- C5Me5)2(S2C6H4)2(CO)2] (M: Co, Rh) Reviewed

    S. Muratsugu, K. Sodeyama, F. Kitamura, S. Tsukada, M. Tada, S. Tsuneyuki, H. Nishihara

    Chemical Science   2   1960 - 1968   2011

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    DOI: 10.1039/C1SC00272D

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  • Synthesis of photo-switchable 3-FcAB-modified polymer particles Reviewed

    K. Namiki, M. Murata, S. Kume, H. Nishihara

    NEW JOURNAL OF CHEMISTRY   35   2146 - 2152   2011

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    DOI: 10.1039/C1NJ20189A

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  • Bottom-Up Fabrication of Redox-Active Metal Complex Oligomer Wires on an H-terminated Si(111) Surface Reviewed

    H. Maeda, R. Sakamoto, Y. Nishimori, J. Sendo, F. Toshimitsu, Y. Yamanoi, H. Nishihara

    CHEMICAL COMMUNICATIONS   47 ( 30 )   8644 - 8646   2011

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    DOI: 10.1039/C1CC12832A

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  • Facile synthesis of hypersilylated aromatic compounds by palladium-mediated arylation reaction Reviewed

    Aldes Lesbani, Hitoshi Kondo, Jun-Ichi Sato, Yoshinori Yamanoi, Hiroshi Nishihara

    Chemical Communications   46 ( 41 )   7784 - 7786   2010.11

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    DOI: 10.1039/c0cc00352b

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  • Double Protonation of 1,5-Bis(triarylaminoethynyl)anthraquinone To Form a Paramagnetic Pentacyclic Dipyrylium Salt Reviewed

    Koya Prabhakara Rao, Tetsuro Kusamoto, Fumiyuki Toshimitsu, Kiyotaka Inayoshi, Shoko Kume, Ryota Sakamoto, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 35 )   12472 - 12479   2010.9

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    DOI: 10.1021/ja105250f

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  • Dual emission caused by ring inversion isomerization of a 4-methyl-2-pyridyl-pyrimidine copper(I) complex Reviewed

    Michihiro Nishikawa, Kuniharu Nomoto, Shoko Kume, Keiichi Inoue, Makoto Sakai, Masaaki Fujii, Hiroshi Nishihara

    Journal of the American Chemical Society   132 ( 28 )   9579 - 9581   2010.7

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    DOI: 10.1021/ja103718e

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  • Surface junction effects on the electron conduction of molecular wires Reviewed

    Tomochika Kurita, Yoshihiko Nishimori, Fumiyuki Toshimitsu, Satoshi Muratsugu, Shoko Kume, Hiroshi Nishihara

    Journal of the American Chemical Society   132 ( 13 )   4524 - 4525   2010.4

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    DOI: 10.1021/ja910462x

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  • A photosensing system composed of photosystem I, molecular wire, gold nanoparticle, and double surfactants in water. Reviewed International journal

    Miyachi M, Yamanoi Y, Shibata Y, Matsumoto H, Nakazato K, Konno M, Ito K, Inoue Y, Nishihara H

    Chemical communications (Cambridge, England)   46 ( 15 )   2557 - 2559   2010.4

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  • Controlled Storage of Ferrocene Derivatives as Redox-Active Molecules in Dendrimers Reviewed

    Yousuke Ochi, Mana Suzuki, Takane Imaoka, Masaki Murata, Hiroshi Nishihara, Yasuaki Einaga, Kimihisa Yamamoto

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 14 )   5061 - 5069   2010.4

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  • Acid-Base Responsive Photoelectric Conversion of a Hydroxyazobenzene-appended Bipyridine Copper Complex System Reviewed

    Satoshi Umeki, Shoko Kume, Hiroshi Nishihara

    CHEMISTRY LETTERS   39 ( 3 )   204 - 205   2010.3

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    DOI: 10.1246/cl.2010.204

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  • Thioacetyl-Terminated Ferrocene-Anthraquinone Conjugates: Synthesis, Photo- and Electrochemical Properties Triggered by Protonation-Induced Intramolecular Electron Transfer Reviewed

    Wen-Wei Zhang, Mio Kondo, Takako Fujita, Kosuke Namiki, Masaki Murata, Hiroshi Nishihara

    MOLECULES   15 ( 1 )   150 - 163   2010.1

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    DOI: 10.3390/molecules15010150

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  • Versatile Synthesis of Blue Luminescent Siloles and Germoles and Hydrogen-Bond-Assisted Color Alteration Reviewed

    Yusuke Yabusaki, Norikazu Ohshima, Hitoshi Kondo, Tetsuro Kusamoto, Yoshinori Yamanoi, Hiroshi Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   16 ( 19 )   5581 - 5585   2010

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  • Cyclization of TEMPO Radicals Bound to Metalladithiolene Induced by SOMO-HOMO Energy-Level Conversion Reviewed

    T. Kusamoto, S. Kume, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   49   529 - 531   2010

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  • Molten matrix sputtering synthesis of water-soluble luminescent Au nanoparticles with a large Stokes shift Reviewed

    Yuichi Shishino, Tetsu Yonezawa, Koji Kawai, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   46 ( 38 )   7211 - 7213   2010

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  • A new special pair model comprising meso-di-p-anisylaminoporphyrin: enhancement of visible-light absorptivities and quantification of electronic communication in mixed-valent cation radical Reviewed

    Ryota Sakamoto, Michihiro Nishikawa, Takeshi Yamamura, Shoko Kume, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   46 ( 12 )   2028 - 2030   2010

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  • Integrated Palladium-catalyzed Arylation of the Heavier Group 14 Hydride Reviewed

    A. Lesbani, H. Kondo, Y. Yabusaki, M. Nakai, Y. Yamanoi, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   16   13519 - 13527   2010

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  • Photosynthetic hydrogen production Reviewed

    S. I. Allakhverdiev, V. Thavasi, V. D. Kreslavski, S. K. Zharmukhamedov, V. V. Klimov, S. Ramakrishna, D. A. Los, M. Mimuro, H. Nishihara, R. Carpentier

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS   11 ( 2 )   101 - 113   2010

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  • Intramolecular electron arrangement with a rotative trigger Reviewed

    Shoko Kume, Kuniharu Nomoto, Tetsuro Kusamoto, Hiroshi Nishihara

    Journal of the American Chemical Society   131 ( 40 )   14198 - 14199   2009.10

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  • Counterion-dependent valence tautomerization of ferrocenyl-conjugated pyrylium salts Reviewed

    Mio Kondo, Maai Uchikawa, Kosuke Namiki, Wen-Wei Zhang, Shoko Kume, Eiji Nishibori, Hiroyuki Suwa, Shinobu Aoyagi, Makoto Sakata, Masaki Murata, Yoshio Kobayashi, Hiroshi Nishihara

    Journal of the American Chemical Society   131 ( 34 )   12112 - 12124   2009.9

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  • Efficient Synthesis of Arylsilanes by Cross-coupling of Aromatic Compounds with Hydrosilanes as Silicon Sources Reviewed

    Yoshinori Yamanoi, Hiroshi Nishihara

    JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN   67 ( 8 )   778 - 786   2009.8

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  • A Single Molecular System Gating Electron Transfer by Ring Inversion of a Methylpyridylpyrimidine Ligand on Copper Reviewed

    Kuniharu Nomoto, Shoko Kume, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   131 ( 11 )   3830 - +   2009.3

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  • Two-Electron Reduction of a Rh−Mo−Rh Dithiolato Complex To Form a Triplet Ground State Associated with a Change in CO Coordination Mode Reviewed

    Satoshi Muratsugu, Keitaro Sodeyama, Fusao Kitamura, Manabu Sugimoto, Shinji Tsuneyuki, Seiji Miyashita, Tatsuhisa Kato, Hiroshi Nishihara

    Journal of the American Chemical Society   131 ( 4 )   1388 - +   2009.2

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  • trans-cis Photoisomerization of Azobenzene-Conjugated Dithiolato-Bipyridine Platinum(II) Complexes: Extension of Photoresponse to Longer Wavelengths and Photocontrollable Tristability Reviewed

    Ryota Sakamoto, Shoko Kume, Manabu Sugimoto, Hiroshi Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   15 ( 6 )   1429 - 1439   2009

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  • Reversible Light-induced Magnetization Change in an Azobenzene-attached Pyridylbenzimidazole Complex of Iron(II) at Room Temperature Reviewed

    Y. Hasegawa, S. Kume, H. Nishihara

    DALTON TRANSACTIONS   2009   280 - 284   2009

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  • Development of a versatile synthesis method for trinuclear Co(III), Rh(III), and Ir(III) dithiolene complexes, and their crystal structures and multi-step redox properties Reviewed

    Yusuke Shibata, Baohua Zhu, Shoko Kume, Hiroshi Nishihara

    DALTON TRANSACTIONS   ( 11 )   1939 - 1943   2009

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  • Plugging a Molecular Wire into Photosystem I: Reconstitution of the Photoelectric Conversion System on a Gold Electrode Reviewed

    Nao Terasaki, Noritaka Yamamoto, Takashi Hiraga, Yoshinori Yamanoi, Tetsu Yonezawa, Hiroshi Nishihara, Tsutomu Ohmori, Makoto Sakai, Masaaki Fujii, Akihiko Tohri, Masako Iwai, Yasunori Inoue, Satoshi Yoneyama, Makoto Minakata, Isao Enami

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   48 ( 9 )   1585 - 1587   2009

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    DOI: 10.1002/anie.200805748

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  • A Cyclic Hexanuclear Heterometalladithiolene Cluster [{(Cp*Rh)(2)Mo(mu-CO)(2)(CO)}(2)(S2C6H2S2)(2)] with Two pi-Conjugated S2C6S2 Bridges: Synthesis, Crystal Structure, and Properties Reviewed

    Bao-Hua Zhu, Yusuke Shibata, Satoshi Muratsugu, Yoshinori Yamanoi, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   48 ( 21 )   3858 - 3861   2009

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    DOI: 10.1002/anie.200900509

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  • Surface immobilization of PSI using vitamin K1-like molecular wires for fabrication of a bio-photoelectrode Reviewed International journal

    M. Miyachi, Y. Yamanoi, T. Yonezawa, H. Nishihara, M. Iwai, M. Konno, M. Iwai, Y. Inoue

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   9 ( 3 )   1722 - 1726   2009

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    We present a bio-photoelectrode made of photosystem I complex (PSI) of cyanobacteria, Thermosynechococcus elongatus, and molecular wires. The newly designed and synthesized molecular wire similar to vitamin K1 (VK1) has a naphthoquinone moiety that can connect to PSI, and a terpyridine moiety for connection to a Co(II) ion. Surface immobilization of PSI and molecular wires was performed by a self-assembled monolayer (SAM) formation process at indium tin oxide (ITO) followed by stepwise coordination reactions. The PSI-immobilized ITO showed a photocurrent action spectrum, whose profile was consistent with that of PSI. We have demonstrated a new method for the immobilization of PSI on the electrode surface, useful in the construction of phovoltaic cells or photon-sensing devices.

    DOI: 10.1166/JNN.2009.S106

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  • Superior Electron-Transport Ability of π-Conjugated Redox Molecular Wires Prepared by the Stepwise Coordination Method on a Surface Reviewed

    Y. Nishimori, K. Kanaizuka, T. Kurita, T. Nagatsu, Y. Segawa, F. Toshimitsu, S. Muratsugu, M. Utsuno, S. Kume, M. Murata, H. Nishihara

    Chemistry-An Asian Journal   4   1361 - 1367   2009

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    DOI: 10.1002/ASIA.200900072

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  • Hydrogen photoproduction by use of photosynthetic organisms and biomimetic systems Reviewed

    S. I. Allakhverdiev, V. D. Kreslavski, V. Thavasi, S. K. Zharmukhamedov, V. V. Klimov, T. Nagata, H. Nishihara, S. Ramakrishna

    PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES   8   148 - 156   2009

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    DOI: 10.1039/B814932A

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  • Alcohol- and acid-causing reversible switching of near-infrared absorption and luminescence in a donor-acceptor conjugated system Reviewed

    Mio Kondo, Maai Uchikawa, Shoko Kume, Hiroshi Nishihara

    Chemical Communications   ( 15 )   1993 - 1995   2009

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    DOI: 10.1039/b823248b

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  • Direct and selective arylation of tertiary silanes with rhodium catalyst Reviewed

    Yoshinori Yamanoi, Hiroshi Nishihara

    JOURNAL OF ORGANIC CHEMISTRY   73 ( 17 )   6671 - 6678   2008.9

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  • INOR 1056-Reversible photoswitching of electronic communication between ferrocene moieties in bis(ferrocenyl)dimethyldihydropyrene

    Satoshi Muratsugu, Shoko Kume, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   235   2008.4

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  • INOR 170-Similarity in structure and difference in electronic nature between Co-Mo-Co and Rh-Mo-Rh bonds in dithiolato-bridged cluster complexes

    Satoshi Muratsugu, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   235   2008.4

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  • Cross-sectional STEM observation of nanoparticle-attached silicon wafer: Specimen prepared by focused ion-beam Reviewed

    Tetsu Yonezawa, Yoshinori Yamanoi, Hiroshi Nishihara

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   8 ( 3 )   1518 - 1522   2008.3

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  • Wet Preparation of Metal Nanoparticles and their Immobilization on Silicon Substrates

    Tetsu Yonezawa, Yoshinori Yamanoi, Hiroshi Nishihara

    Metal Nanoclusters in Catalysis and Materials Science: The Issue of Size Control   453 - 458   2008

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    DOI: 10.1016/B978-044453057-8.50035-0

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  • Room-temperature immobilization of gold nanoparticles on Si(111) surface and their electron behaviour Reviewed

    Tetsu Yonezawa, Kazuki Uchida, Yoshinori Yamanoi, Shintaro Horinouchi, Nao Terasaki, Hiroshi Nishihara

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   10 ( 46 )   6925 - 6927   2008

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  • Synthesis of an anthraquinone-bridged bis(terpyridine) ligand and its use in the stepwise fabrication of complex oligomer wires on gold Reviewed

    Mitsuya Utsuno, Fumiyuki Toshimitsu, Shoko Kume, Hiroshi Nishihara

    MACROMOLECULAR SYMPOSIA   270 ( 1 )   153 - 160   2008

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    DOI: 10.1002/masy.200851018

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  • Nanocage catalysts-rhodium nanoclusters encapsulated with dendrimers as accessible and stable catalysts for olefins and nitroarene hydrogenations Reviewed International journal

    Nakamula Ikuse, Yamanoi Yoshinori, Yonezawa Tetsu, Imaoka Takane, Yamamoto Kimihisa, Nishihara Hiroshi

    CHEMICAL COMMUNICATIONS   ( 44 )   5716 - 5718   2008

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  • Modification of the luminescence spectra of chloro(tetrapyridylcyclotetramine)europium complexes by fine tuning of the Eu-Cl distance with outer-sphere counterions in the solid state, in a polymer matrix and in solution Reviewed

    Atsushi Wada, Masayuki Watanabe, Yoshinori Yamanoi, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   ( 14 )   1671 - 1673   2008

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    DOI: 10.1039/b716987f

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  • Redox-Assisted Ring Closing Reaction of the Photogenerated Cyclophanediene Form of Bis(ferrocenyl)dimethyldihydropyrene Reviewed

    S. Muratsugu, S. Kume, H. Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   130   7204 - 7205   2008

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    DOI: 10.1021/JA8016494

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  • Surface Bottom-up Fabrication of Porphyrin-terminated Metal Complex Molecular Wires with Photo-electron Conversion Properties on ITO Reviewed

    M. Miyachi, M. Ohta, M. Nakai, Y. Kubota, Y. Yamanoi, T. Yonezawa, H. Nishihara

    CHEMISTRY LETTERS   37 ( 4 )   404 - 405   2008

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  • Electronic Communication in the Mixed-valence States of Cyclobutadienecobalt Complexes Having Two Ferrocenes and Two Anthraquinones Reviewed

    T. Nakaya, K. Namiki, M. Murata, K. Kanaizuka, M. Kurashina, T. Fujita, H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   18   124 - 130   2008

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    DOI: 10.1007/S10904-007-9182-8

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  • Visible-light photochromism of triarylamine- or ferrocene-bound diethynylethenes that switches electronic communication between redox sites and luminescence Reviewed

    Ryota Sakamoto, Shoko Kume, Hiroshi Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   14 ( 23 )   6978 - 6986   2008

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  • Realization of SOMO-HOMO Level Conversion for a TEMPO-Dithiolate Ligand by Coordination to Platinum(II) Reviewed

    T. Kusamoto, S. Kume, H. Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   130   13844 - 13845   2008

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    DOI: 10.1021/JA805751H

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  • Observation of Electrochemical Single-Electron-Transfer Events of Au Nanoparticles in Aqueous Solution in the Presence of Both Ammonium and Sulfonate Surface-Active Agents Reviewed International journal

    M. Nakai, Y. Yamanoi, Y. Nishimori, T. Yonezawa, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   47 ( 35 )   6699 - 6702   2008

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    DOI: 10.1002/ANIE.200801704

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  • Photochrome-coupled Metal Complexes: Molecular Processing of Photon Stimuli Reviewed

    S. Kume, H. Nishihara

    DALTON TRANSACTIONS   2008   3260 - 3271   2008

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    DOI: 10.1039/B716947G

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  • Bio-conjugate Photosensitive Nanomaterial

    HIRAGA Takashi, INOUE Yasunori, NISHIHARA Hiroshi, MINAKATA Makoto, FUJII Masaaki

    Journal of the Vacuum Society of Japan   50 ( 12 )   745 - 751   2007.12

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    Bio-components from living body are very attractive nano-materials, because they have already achieved ultra-high and ultimate performance as the result of many cycles of natural selection and mutation. We first succeeded in obtaining the electron from the electron relay system in the inside of PSI by use of molecular wire as a connector, which was designed for facile electron transfer, and also demonstrated FET-operation using the electrons from PSI via. the molecular wire. This study has confirmed the validity of the novel approach and strategy to utilize bio-components as the core parts in an artificial system, which can be applied to many kinds of bio-functions.<br>

    DOI: 10.3131/jvsj.50.745

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  • Synthesis of pendant-type anthraquinone-bridged cofacial dinuclear platinum(II) complexes and their emission properties Reviewed

    Mitsuya Utsuno, Tomona Yutaka, Masaki Murata, Masato Kurihara, Naoto Tamai, Hiroshi Nishihara

    INORGANIC CHEMISTRY   46 ( 26 )   11291 - 11296   2007.12

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  • Efficient preparation of Monohydrosilanes using palladium-catalyzed si-c bond formation Reviewed

    Yoshinori Yamanoi, Takafumi Taira, Jun-Ichi Sato, Ikuse Nakamula, Hiroshi Nishihara

    ORGANIC LETTERS   9 ( 22 )   4543 - 4546   2007.10

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  • Bio-photo sensor: Cyanobacterial photosystem I coupled with transistor via molecular wire Reviewed

    Nao Terasaki, Noritaka Yamamoto, Kaoru Tamada, Mineyuki Hattori, Takashi Hiraga, Akihiko Tohri, Ikutaro Sato, Masako Iwai, Michinao Iwai, Shunpel Taguchi, Isao Enami, Yasunori Inoue, Yoshinori Yamanoi, Tetsu Yonezawa, Katsuya Mizuno, Masaki Murata, Hiroshi Nishihara, Satoshi Yoneyama, Makoto Minakata, Tsutomu Ohmori, Makoto Sakai, Masaaki Fujii

    BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS   1767 ( 6 )   653 - 659   2007.6

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  • Bio-photosensor: Cyanobacterial photosystem I coupled with transistor via molecular wire. International journal

    Nao Terasaki, Noritaka Yamamoto, Kaoru Tamada, Mineyuki Hattori, Takashi Hiraga, Akihiko Tohri, Ikutaro Sato, Masako Iwai, Michinao Iwai, Shunpei Taguchi, Isao Enami, Yasunori Inoue, Yoshinori Yamanoi, Tetsu Yonezawa, Katsuya Mizuno, Masaki Murata, Hiroshi Nishihara, Satoshi Yoneyama, Makoto Minakata, Tsutomu Ohmori, Makoto Sakai, Masaaki Fujii

    Biochimica et biophysica acta   1767 ( 6 )   653 - 9   2007.6

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    We report on the first successful output of electrons directly from photosystem I (PSI) of thermophilic cyanobacteria to the gate of a field-effect transistor (FET) by bypassing electron flow via a newly designed molecular wire, i.e., artificial vitamin K(1), and a gold nanoparticle; in short, this newly manufactured photosensor employs a bio-functional unit as the core of the device. Photo-electrons generated by the irradiation of molecular complexes composed of reconstituted PSI on the gate were found to control the FET. This PSI-bio-photosensor can be used to interpret gradation in images. This PSI-FET system is moreover sufficiently stable for use exceeding a period of 1 year.

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  • Control of coordination and luminescence properties of lanthanide complexes using octadentate oligopyridine-amine ligands Reviewed

    Atsushi Wada, Masayuki Watanabe, Yoshinori Yamanoi, Takuya Nankawa, Kosuke Namiki, Mikio Yamasaki, Masaki Murata, Hiroshi Nishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   80 ( 2 )   335 - 345   2007.2

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    DOI: 10.1246/bcsj.80.335

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  • Solar-Energy Conversion Technology Using Photosynthetic Functionality of Cyanobacteria

    Yoshinori Yamanoi, Hiroshi Nishihara

    Kobunshi   56 ( 10 )   835 - 838   2007

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    DOI: 10.1295/kobunshi.56.835

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  • Construction of Redox- and Photo-functional Molecular Systems on Electrode Surface for Application to Molecular Devices Reviewed

    H. Nishihara, K. Kanaizuka, Y. Nishimori, Y. Yamanoi

    COORDINATION CHEMISTRY REVIEWS   251 ( 21-24 )   2674 - 2687   2007

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  • Preparation of new molecular wires for photovoltaic cell using photosystem I

    Mariko Miyachi, Yoshinori Yamanoi, Hiroshi Nishihara

    ACS National Meeting Book of Abstracts   2007

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  • Metal-based Photoswitches Derived from Photoisomerization Reviewed

    S. Kume, H. Nishihara

    Structure and Bonding   123   79 - 112   2007

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    DOI: 10.1007/430_2006_038

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  • Reversible Photochromism of a Ferrocenylazobenzene Monolayer Controllable by a Single Green Light Source Reviewed

    K. Namiki, A. Sakamoto, M. Murata, S. Kume, H. Nishihara

    CHEMICAL COMMUNICATIONS   2007   4650 - 4652   2007

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    DOI: 10.1039/B713107K

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  • Chemistry of coordination space - Preface Reviewed

    H. Nishihara

    COORDINATION CHEMISTRY REVIEWS   251   2489   2007

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    DOI: 10.1016/j.ccr.2007.08.027

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  • Protonation-Induced Cyclocondensation of 1-Aryl Ethynylanthraquinones: Expanding the Conjugation Reviewed

    M. Kondo, M. Uchikawa, W.-W. Zhang, K. Namiki, S. Kume, M. Murata, Y. Kobayashi, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   46   6271 - 6274   2007

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    DOI: 10.1002/ANIE.200701766

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  • Synthesis of Molecular Wires of Linear and Branched Bis(terpyridine) Complex Oligomers and Electrochemical Observation of Through-bond Redox Conduction Reviewed

    Y. Nishimori, K. Kanaizuka, M. Murata, H. Nishihara

    Chemistry-An Asian Journal   2   367 - 376   2007

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    DOI: 10.1002/ASIA.200600350

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  • Synthesis of π-conjugated ferrocene-anthraquinone alternating polymers and their protonation reactions Reviewed

    K. Kojima, W. Zhang, M. Kondo, M. Uchikawa, K. Namiki, T. Fujita, M. Murata, Y. Kobayashi, H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   17   135 - 141   2007

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    DOI: 10.1007/S10904-006-9085-0

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  • Bottom-up Fabrication of Polymer-coated Electrodes and Through-bond Redox Conduction Reviewed

    Y. Nishimori, Y. Yamanoi, S. Kume, H. Nishihara

    ELECTROCHEMISTRY   75 ( 10 )   770 - 776   2007

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  • Assembly of nanosize metallic particles and molecular wires on electrode surfaces Reviewed

    Yoshinori Yamanoi, Hiroshi Nishihara

    CHEMICAL COMMUNICATIONS   ( 39 )   3983 - 3989   2007

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    DOI: 10.1039/b703342g

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  • Synthesis, structure, and magnetic properties of the cobalt(II) 1,3,5_benzenetricarboxylate layered coordination polymer Reviewed

    D. N. Dybtsev, M. P. Yutkin, E. V. Peresypkina, A. V. Virovets, Y. Hasegawa, H. Nishihara, V. P. Fedin

    RUSSIAN CHEMICAL BULLETIN   56   1782 - 1786   2007

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    DOI: 10.1007/S11172-007-0277-8

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  • Rhodium-catalyzed silylation of ortho-functionalized aryl halides with hydrosilanes Reviewed

    Yoshinori Yamanoi, Hiroshi Nishihara

    TETRAHEDRON LETTERS   47 ( 40 )   7157 - 7161   2006.10

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  • Dithiolato-bridged [MRu2] (M = Rh, Ir, Ru) triangular 50e(-) cluster complexes synthesized by complete metal framework reconstruction Reviewed

    Nakagawa Norikiyo, Murata Masaki, Sugimoto Manabu, Nishihara Hiroshi

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY   ( 11 )   2129 - 2131   2006.6

  • Redox-Based Functionalities of Multinuclear Metal Complex Systems Reviewed

    Hiroshi Nishihara

    Frontiers in Transition Metal-Containing Polymers   369 - 397   2006.5

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    DOI: 10.1002/9780470086063.ch9

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  • Size-controlled gold-catalyzed growth of Prussian blue nanopillars Reviewed

    Sailaja Sunkari, Sayoko Nagashima, Masaki Murata, Hiroshi Nishihara, Yoshitaka Matsui, Kazuyuki Nishio, Hideki Masuda

    CHEMISTRY LETTERS   35 ( 4 )   406 - 407   2006.4

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    DOI: 10.1246/cl.2006.406

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  • Ion-pair extraction of Am(III) and Eu(III) with oligo-pyridine ligand Reviewed

    K Ishimori, M Watanabe, T Kimura, M Murata, H Nishihara

    JOURNAL OF ALLOYS AND COMPOUNDS   408   1278 - 1282   2006.2

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    DOI: 10.1016/j.jallcom.2005.04.129

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  • Structural analysis of silicon(111) surface immobilized by alkenylbenzenethiolato-protected gold nanoparticles

    Kazuki Uchida, Shintaro Horinouchi, Yoshinori Yamanoi, Tetsu Yonezawa, Hiroshi Nishihara, Nao Terasaki

    Polymer Preprints, Japan   55 ( 2 )   3490   2006

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  • Surface bottom-up construction of electro- and photo-functional metal complex polymers Reviewed

    H. Nishihara, Y. Nishimori, S. Muratsugu, M. Utsuno, F. Toshimitsu, Y. Segawa, K. Kanaizuka, S. Kume

    PMSE Preprints   95   24 - 24   2006

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  • Guest-Induced Instant and Reversible Crystal-to-Crystal Transformation of 1,4-Bis(ferrocenylethynyl)anthraquinone Reviewed

    M. Kondo, M. Murata, H. Nishihara, E. Nishibori, S. Aoyagi, M. Yoshida, Y. Kinoshita, M. Sakata

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   45   5461 - 5464   2006

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  • A Ferrocenylspiropyran That Functions as a Molecular Photomemory with Controllable Depth Reviewed

    S. Nagashima, M. Murata, H. Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   45   4298 - 4301   2006

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    DOI: 10.1002/ANIE.200600535

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  • Photo-assisted immobilization of gold nanoparticles on silicon substrate

    Tetsu Yonezawa, Naoto Shirahata, Nao Terasaki, Yoshinori Yamanoi, Hiroshi Nishihara

    Polymer Preprints, Japan   55 ( 1 )   1309   2006

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  • Rh nanoparticles stabilized with phenylazomethine dendrimers as a catalyst for olefin hydrogenation

    Ikuse Nakamula, Yoshinori Yamanoi, Tetsu Yonezawa, Hiroshi Nishihara, Kimihisa Yamamoto

    Polymer Preprints, Japan   55 ( 2 )   4082   2006

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  • Visible-light photochromism of bis(ferrocenylethynyl)ethenes switches electronic communication between ferrocene sites Reviewed

    Ryota Sakamoto, Masaki Murata, Hiroshi Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   45 ( 29 )   4793 - 4795   2006

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    DOI: 10.1002/anie.200601067

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  • Synthesis of a new terpyridine ligand combined with ruthenium(II) complex and its usage in the stepwise fabrication of complex polymer wires on gold Reviewed

    Y Ohba, K Kanaizuka, M Murata, H Nishihara

    MACROMOLECULAR SYMPOSIA   235   31 - 38   2006

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    DOI: 10.1002/masy.200650305

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  • Detailed Structural Examinations of Covalently Immobilized Gold Nanoparticles onto Hydrogen-terminated Silicon Surface Reviewed

    Y. Yamanoi, N. Shirahata, T. Yonezawa, N. Terasaki, N. Yamamoto, Y. Matsui, K. Nishio, H. Masuda, Y. Ikuhara, H. Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   12 ( 1 )   314 - 323   2006

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    DOI: 10.1002/CHEM.200500455

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  • Hydrogen Storage Properties of Isocyanide-stabilized Palladium Nanoparticles Reviewed

    S. Horinouchi, Y. Yamanoi, T. Yonezawa, T. Mouri, H. Nishihara

    LANGMUIR   22   1880 - 1884   2006

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    DOI: 10.1021/LA052657+

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  • Synthesis, Single Crystal X-ray Analysis, and TEM for a Single-sized Au11 Cluster Stabilized by SR Ligands: the Interface between Molecules and Particles Reviewed

    K. Nunokawa, S. Onaka, M. Ito, M. Horibe, T. Yonezawa, H. Nishihara, T. Ozeki, H. Chiba, S. Watase, M. Nakamoto

    JOURNAL OF ORGANOMETALLIC CHEMISTRY   691   638 - 642   2006

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  • Photoisomerization-induced Change in the Size of Ferrocenylazobenzene-attached Dendrimers Reviewed

    M.-C. Daniel, A. Sakamoto, J. Ruiz, D. Astruc, H. Nishihara

    CHEMISTRY LETTERS   35 ( 1 )   38 - 39   2006

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    A family of 3-ferrocenylazobenzene-attached dendrimers, 9mer, 27mer, and 81mer, which is the first series of redox-active photochromic dendrimers exhibit photochromism responding to three different light sources, i.e., 365, 436, and 546 nm lights. Decreases in the size of the dendrimers induced by trans-to-cis photoisomerization appeared and became more significant with increases in the size of the dendrimers up to 81mer. Electrochemical treatment of the 81mer provided a photo-sensitive and redox-active dendrimer film-coated electrode.

    DOI: 10.1246/CL.2006.38

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  • Protonation, deprotonation, and protonation: Conjugated photochemical reactions of ferrocenylazophenol Reviewed

    Y Men, Korupoju, SR, M Kurihara, J Mizutani, H Nishihara

    CHEMISTRY-A EUROPEAN JOURNAL   11 ( 24 )   7322 - 7327   2005.12

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    DOI: 10.1002/chem.200500713

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  • UV-Vis, NMR, and time-resolved spectroscopy analysis of photolsomerization behavior of three- and six-azobenzene-bound tris(bipyridine)cobalt complexes Reviewed

    K Yamaguchi, S Kume, K Namiki, M Murata, N Tamai, H Nishihara

    INORGANIC CHEMISTRY   44 ( 24 )   9056 - 9067   2005.11

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    DOI: 10.1021/ic0513538

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  • Electron transfer in ferrocene-containing pi-conjugated polymers Reviewed

    H Nishihara, M Murata

    JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS   15 ( 1 )   147 - 156   2005.3

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    DOI: 10.1007/s10904-004-2909-x

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  • Reversible photoelectronic signal conversion based on photoisomerization-controlled coordination change of azobenzene-bipyridine ligands to copper Reviewed

    S Kume, M Murata, T Ozeki, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   127 ( 2 )   490 - 491   2005.1

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    DOI: 10.1021/ja045093p

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  • Combination of redox- and photochemistry of azo-conjugated metal complexes Reviewed

    H. Nishihara

    COORDINATION CHEMISTRY REVIEWS   249   1468 - 1475   2005

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    DOI: 10.1016/J.CCR.2004.11.009

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  • Synthesis and properties of π-conjigated oligomers and polymers exhibiting the flatband ferromagnetism

    Takeshi Hamada, Masashi Kurashina, Yuta Hasegawa, Yoshinori Yamanoi, Hiroshi Nishihara, Ryotaro Arita, Yuji Suwa, Kszujiko Kuroki, Hideo Aoki

    Polymer Preprints, Japan   54 ( 2 )   4143   2005

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  • Detailed structure observation of gold nanopracticles immobilized on silicon surface

    Tetsu Yonezawa, Yoshinori Yamanoi, Hiroshi Nishihara, Nao Terasaki, Noritaka Yamamoto, Naoto Shirahata

    Polymer Preprints, Japan   54 ( 1 )   965   2005

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  • A new 19-metal-atom cluster [(Me2PhP)10Au12Ag7(NO3)9] with a nearly staggered-staggered M5 ring configuration Reviewed

    K. Nunokawa, M. Ito, T. Sunahara, S. Onaka, T. Ozeki, H Chiba, Y. Funahashi, H. Masuda, T. Yonezawa, H. Nishihara, M. Nakamoto, M. Yamamoto

    DALTON TRANSACTIONS   2005   2726 - 2730   2005

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    DOI: 10.1039/B503434E

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  • Photo-controllable tristability of a dithiolato-bipyridine-Pt(ii) complex molecule containing two azobenzene moieties

    Ryota Sakamoto, Masaki Murata, Shoko Kume, Hidekazu Sampei, Manabu Sugimoto, Hiroshi Nishihara

    Chemical Communications   ( 9 )   1215 - 1217   2005

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    DOI: 10.1039/b415293j

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  • Photon-, Electron-, and Proton-Induced Isomerization Behavior of Ferrocenylazobenzenes

    A. Sakamoto, A. Hirooka, K. Namiki, M. Kurihara, M. Murata, M. Sugimoto, H. Nishihara

    Inorganic Chemistry   44 ( 21 )   7547 - 7558   2005

  • Stepwise Preparation of Linear pi-Conjugated Bis(terpyridine)metal Polymer Chains at Gold Surface Reviewed

    K. Kanaizuka, M. Murata, Y. Nishimori, I. Mori, K. Nishio, H. Masuda, H. Nishihara

    CHEMISTRY LETTERS   34 ( 4 )   534 - 535   2005

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    Defect-free structures of a film composed of linear redox polymer chains were prepared using stepwise complexation of Fe(II) and/or Co(II/III) ions with azobenzene-bridged bis(tpy) (tpy = 2,2′:6′,2″-terpyridine) ligands, tpy–AB–tpy, on tpy-terminated SAM on gold. This method realizes a formation of desired number of polymer units (for example, 47-mer of Co(tpy)2) and a desired sequence of Co–Fe heterometal structures in the polymer chain (for example, 10-mer of Co(tpy)2 plus 5-mer of Fe(tpy)2).

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  • Synthesis of.surfactant-stabilized Co/Au bimetallic nanoparticles with a core-shell structure Reviewed

    Tetsu Yonezawa, Kazuhiko Shibuya, Hiroshi Nishihara

    TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 30, NO 4   30 ( 4 )   1255 - 1257   2005

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  • Synthesis and Physical Properties of p-Conjugated Metallacycle Polymers of Cobalt and Ruthenium Reviewed

    Kurashina Masashi, Murata Masaki, Nishihara Hiroshi

    Macromolecular Symposia   Vol.209 ( No.1 )   141 - 162   2004.5

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    DOI: 10.1002/masy.200450510

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  • Large solvent and potential effects on the collective surface plasmon band of gold nanoparticle films Reviewed

    M Yamada, H Nishihara

    CHEMPHYSCHEM   5 ( 4 )   555 - 559   2004.4

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    DOI: 10.1002/cphc.200301013

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  • Multi-Mode Molecular Switching Properties and Functions of Azo-Conjugated Metal Complexes Reviewed

    H. Nishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   77   407 - 428   2004

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    DOI: 10.1246/BCSJ.77.407

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  • Immobilization of Gold Nanoparticles onto Silicon Surfaces by Si-C Covalent Bonds Reviewed

    Y. Yamanoi, T. Yonezawa, N. Shirahata, H. Nishihara

    LANGMUIR   20   1054 - 1056   2004

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    DOI: 10.1021/LA036437C

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  • Electrochemical deposition of metal nanoparticles functionalized with multiple redox molecules Reviewed

    M Yamada, H Nishihara

    COMPTES RENDUS CHIMIE   6 ( 8-10 )   919 - 934   2003.8

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    DOI: 10.1016/j.crci.2003.07.005

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  • Electrochemical deposition of biferrocene derivative-attached gold nanoparticles and the morphology of the formed film Reviewed

    M Yamada, T Tadera, K Kubo, H Nishihara

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 16 )   3703 - 3711   2003.4

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    DOI: 10.1021/jp027086y

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  • Redox Chemistry and Functionalities of Conjugated Ferrocene Systems Reviewed

    H. Nishihara

    Advances in Inorganic Chemistry   53   41 - 86   2002

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  • Redox behavior of biferrocene dithiol and disulfide derivatives in SAMs with and without gold clusters on the gold substrate Reviewed

    Y Men, K Kubo, M Kurihara, H Nishihara

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   3 ( 16 )   3427 - 3430   2001

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  • Synthesis and physical properties of a pi-conjugated ruthenium(II) dinuclear complex involving an azobenzene-bridged bis(terpyridine) ligand Reviewed

    T Yutaka, M Kurihara, H Nishihara

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   343   511 - 516   2000

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  • Synthesis and redox properties of a π-conjugated cyclobutadienecobalt polymer containing ferrocenyl groups

    Masaki Murata, Takeo Hoshi, Isao Matsuoka, Takuya Nankawa, Masato Kurihara, Hiroshi Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   10 ( 4 )   209 - 219   2000

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  • Synthesis, structure, and redox properties of [{(eta(5)-C5H5)Co(S2C6H4)}(2)Mo(CO)(2)], a novel metalladithiolene cluster Reviewed

    M Nihei, T Nankawa, M Kurihara, H Nishihara

    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   38 ( 8 )   1098 - 1100   1999

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  • Synthesis and physical properties of pi-conjugated organometallic polymers Reviewed

    Matsuoka, I, M Kurosawa, M Murata, T Matsuda, H Yoshikawa, T Hoshi, M Kurihara, H Nishihara

    PROGRESS OF FINE CHEMISTRY AND FUNCTIONAL POLYMERS   173 - 174   1998

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  • Chemical Modification of an Alkanethiol Monolayers for Protecting Iron against Corrosion Reviewed

    K. Nozawa, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   39 ( 9 )   1625 - 1639   1997

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  • Chemical Modification of an Alkanethiol Self-Assembled Layer to Prevent Corrosion of Copper Reviewed

    R. Haneda, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   144 ( 4 )   1215 - 1221   1997

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    DOI: 10.1149/1.1837575

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  • Inhibition of Iron Corrosion in Sulfuric Acid at Elevated Temperatures by Bismuth(III) Compounds Reviewed

    N. Nakai, H. Nishihara, K. Aramaki

    CORROSION   53 ( 9 )   679 - 687   1997

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    DOI: 10.5006/1.3290300

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  • Inhibition effects of amines and thiols on iron corrosion in anhydrous methanol solution containing FeCl3 Reviewed

    T Kawai, H Nishihara, K Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   143 ( 12 )   3866 - 3873   1996.12

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  • The corrosion of iron in electrolytic dimethylformamide solutions of some carboxylic acids and the effect of added halide ions Reviewed

    Y Matsumoto, T Kawai, H Nishihara, K Aramaki

    CORROSION SCIENCE   38 ( 11 )   1899 - 1913   1996.11

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  • Polarization and impedance studies on the effects of anion and cation inhibitors on corrosion of iron in an electrolytic anhydrous methanol solution of ferric chloride Reviewed

    T Kawai, H Nishihara, K Aramaki

    CORROSION SCIENCE   38 ( 2 )   225 - 237   1996.2

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  • The Inhibition of Pit Nucleation and Growth on the Passive Surface of Iron in a Borate Buffer Solution Containing Cl- by Oxidizing Inhibitiors Reviewed

    E. Fujioka, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   38 ( 11 )   1915 - 1933   1996

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  • Inhibition of Passive Film Breakdown on Iron in a Borate Buffer Solution Containing Chloride Ions by Mixtures of Hard and Soft Base Inhibitors Reviewed

    E. Fujioka, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   38   1669 - 1679   1996

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  • The Synergistic Inhibition Effect of Octylmercaptopropionate and 8-Quinolinol on the Corrosion of Iron in an Aerated 0.5 M Na2SO4 Reviewed

    T. Suzuki, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   38   1223 - 1234   1996

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  • The Inhibition Effect of Bismuth(III) Compounds on the Corrosion of Iron in 1 N HCl at Elevated Temperatures Reviewed

    T. Hayashi, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   38 ( 6 )   867 - 879   1996

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  • Permeability of Alkanethiol Self-assembled Monolayers Adsorbed on Copper Electrodes to Molecular Oxygen Dissolved in 0.5 M Na2SO4 Solution Reviewed

    M. Ishibashi, M. Itoh, H. Nishihara, K. Aramaki

    ELECTROCHIMICA ACTA   41 ( 2 )   241 - 248   1996

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  • CORROSION OF IRON IN ELECTROLYTIC ANHYDROUS METHANOL SOLUTIONS CONTAINING FERRIC-CHLORIDE Reviewed

    T KAWAI, H NISHIHARA, K ARAMAKI

    CORROSION SCIENCE   37 ( 5 )   823 - 831   1995.5

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  • Electrode Surface Modification with Electro-functional Molecules

    NISHIHARA Hiroshi

    Jitsumu Hyomen Gijutsu   46 ( 4 )   292 - 296   1995.4

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    DOI: 10.4139/sfj.46.292

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  • SYNTHESIS OF SOLUBLE COBALTACYCLOPENTADIENE OLIGOMERS AND POLYMERS Reviewed

    N MATSUDA, T SHIMURA, K ARAMAKI, H NISHIHARA

    SYNTHETIC METALS   69 ( 1-3 )   559 - 560   1995.3

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  • SYNTHESIS AND PHYSICAL-PROPERTIES OF TRANSITION-METAL COMPLEXES OF POLY(9-N-HEXYLFLUORENE)AND POLY(1-N-HEXYLINDENE) Reviewed

    H NISHIHARA, J MATSUDA, T HIRAO, K ARAMAKI

    SYNTHETIC METALS   69 ( 1-3 )   551 - 552   1995.3

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  • The Inhibition of Pit Growth on an Iron Surface in a Borate Buffer Solution Containing Chloride Ion by Inhibitors Classified as Soft Bases in the HSAB Principle Reviewed

    M. Yamaguchi, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   37 ( 4 )   571 - 585   1995

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  • Approach to a Metallacycling Polymerization-Reactions of [(5-C5H5)Co(PPh3)2] with ,-diynes and Me3SiCC-C6H4C6H4CCSiMe3 Reviewed

    T. Shimura, A. Ohkubo, K. Aramaki, H. Uekusa, T. Fujita, S. Ohba, H. Nishihara

    INORGANICA CHIMICA ACTA   230   215 - 218   1995

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  • Preparation and Evaluation of 2-Dimensional Polymer-Films by Chemical Modification of and Alkanethiol Self-Assembled Monolayer fro Protection of Copper against Corrosion Reviewed

    M. Itoh, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   142   3936 - 3704   1995

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    DOI: 10.1149/1.2048401

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  • The Protection Ability of 11-Mercapto-1-undecanol Self-Assembled Monolayer Modified with Alkyltrichlorosilanes against Corrosion of Copper Reviewed

    M. Itoh, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   142   1839 - 1846   1995

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    DOI: 10.1149/1.2044203

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  • Two Cobaltacyclopentadienes and One Cyclobutadiene Complex. Reviewed

    T. Fujita, H. Uekusa, A. Ohkubo, T. Shimura, K. Aramaki, H. Nishihara, S. Ohba

    Acta Crystallographica Section C-Structural Chemistry   51   2265 - 2269   1995

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    DOI: 10.1107/S0108270195005993

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  • Anion Selective Polymeric Membrane Electrodes Based on Metallocenes Reviewed

    H. Hisamoto, D. Siswanta, H. Nishihara, K. Suzuki

    ANALYTICA CHIMICA ACTA   304 ( 2 )   171 - 176   1995

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    DOI: 10.1016/0003-2670(94)00614-R

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  • THE CORROSION REACTIONS OF IRON WITH SOME COMPLEXING AGENTS IN AN ELECTROLYTIC ANHYDROUS METHANOL SOLUTION Reviewed

    T KAWAI, H NISHIHARA, K ARAMAKI

    CORROSION SCIENCE   36 ( 12 )   2111 - 2124   1994.12

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  • The Inhibitive Effect of Organic Cations on Passive Film Breakdown of Iron in a Chloride-Containing Borate Buffer Solution Reviewed

    K. Aramaki, M. Toihari, S. Furuya, M. Yamaguchi, H. Nishihara

    CORROSION SCIENCE   36 ( 7 )   1133 - 1141   1994

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  • The Inhibition of Passive Film Breakdown on Iron in a Borate Buffer Solution Containing Chloride Ions by Organic Anion Inhibitors Reviewed

    M. Yamaguchi, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   36 ( 2 )   241 - 258   1994

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  • Effect of Formic Acid on Iron Corrosion in an Anhydrous Methanol Solution Reviewed

    K. Aramaki, M. Sakakibara, N. Saito, H. Nishihara

    Zairyo-to-Kankyo   43   272 - 275   1994

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  • Composite Film Formation on Iron in Sulfuric Acid by Bismuth(III) Chloride and Benzyl Thiocyanate Reviewed

    M. Ohi, H. Nishihara, K. Aramaki

    CORROSION   50 ( 3 )   226 - 233   1994

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    DOI: 10.5006/1.3293514

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  • Mixing of Metal Complex Chemistry and Polymer Chemistry. New Linearly .PI.-Conjugated Metal Complex Polymers.:New Linearly π-Conjugated Metal Complex Polymers

    Nishihara Hiroshi

    Kobunshi   43 ( 12 )   844 - 847   1994

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    DOI: 10.1295/kobunshi.43.844

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  • A Chemical Modification of Alkanethiol Self-Assembled Monolayers with Alkylchlorosilanes for the Protection of Copper against Corrosion Reviewed

    M. Itoh, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   141   2018 - 2023   1994

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    DOI: 10.1149/1.2055053

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  • Corrosion Inhibition of Cobalt in Some Acid Solutions by Bismuth(III) Chloride Reviewed

    M. Itoh, M. Ihara, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   141 ( 2 )   352 - 358   1994

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    DOI: 10.1149/1.2054730

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  • Electrochemical Synthesis of Soluble Poly(9-hexylfluorene) and Poly(1-hexylindene) Reviewed

    J. Matsuda, K. Aramaki, H. Nishihara

    J. Chem. Soc., Faraday Trans.   90   321 - 325   1994

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    DOI: 10.1039/FT9949000321

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  • Synthesis and Reactions of Monosilylated 1,3,5-Hexatriyne and 1,3,5,7-Octatetrayne. Total Synthesis of Caryoynencins Reviewed

    M. Yamaguchi, H.-J. Park, M. Hirama, K. Torisu, S. Nakamura, T. Minami, H. Nishihara, T. Hiraoka

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   67 ( 6 )   1717 - 1725   1994

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    Selective monodesilylation of 1,8-bis(t-butyldiphenylsilyl)-1,3,5,7-octatetrayne and 1,6-bis(t-butyldiphenylsilyl)-1,3,5-hexatriyne with lithiated phenylacetylene gave unstable 1-(t-butyldiphenylsilyl)-1,3,5,7-octatetrayne and 1-(t-butyldiphenylsilyl)-1,3,5-hexatriyne, respectively. The terminal acetylenes on lithiation added to aldehydes and a ketone giving polyynols in high yields. The reaction was applied to the synthesis of polyyne antibiotics, caryoynencins. Polymerization of the terminal octatetrayne on an ITO-coated glass plate gave a film, which showed conductivity of 10−4 S cm−1 when doped with SO3.

    DOI: 10.1246/BCSJ.67.1717

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  • Electrochemical and Spectroscopic Studies on Inhibition Mechanism of Benzyl Thiocyanate for Iron Corrosion in 1 N Perchloric and Hydrochloric Acid Solutions Reviewed

    N. Ohno, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   36   583 - 591   1994

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  • SYNTHESIS OF ORGANOMETALLIC CONDUCTING POLYMERS USING SOLUBLE POLY(N-ALKYLPHENYLENE)S AS LIGANDS Reviewed

    H NISHIHARA, H FUNAKI, T SHIMURA, K ARAMAKI

    SYNTHETIC METALS   55 ( 2-3 )   942 - 947   1993.3

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  • SYNTHESIS OF PI-CONJUGATED ORGANOMETALLIC POLYMERS BASED ON METALLACYCLIZATION REACTIONS Reviewed

    H NISHIHARA, A OHKUBO, K ARAMAKI

    SYNTHETIC METALS   55 ( 2-3 )   821 - 826   1993.3

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  • Self-Assembled Layers of Alkanethiols on Copper for Protection Against Corrosion Reviewed

    Y. Yamamoto, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   140 ( 2 )   436 - 443   1993

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    DOI: 10.1149/1.2221064

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  • Corrosion of Iron in Anhydrous Methanol Reviewed

    M. Sakakibara, N. Saito, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   34   391 - 402   1993

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  • Synthesis of a Novel π-Conjugated Organometallic Polymer, Poly(4,4’-biphenylene 2,5-cobaltacyclopenta-2,4-dienylene), by Metallacycling Polymerization (MCP) Reviewed

    A. Ohkubo, K. Aramaki, H. Nishihara

    CHEMISTRY LETTERS   22 ( 2 )   271 - 274   1993

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    A new π-conjugated organometallic polymer of which framework is in part composed of cobaltacyclopentadienes has been synthesized by a metallacycle formation reaction of CpCo(PPh3)2 with 4,4′-diethynylbiphenyl. The polymer, poly(4,4′-biphenylene 2,5-cobaltacyclopenta-2,4-dienylene) has a strong absorption band around 500 run, and is oxidized at +0.306 V vs. Ag/Ag+ in dichloromethane and reduced at −1.8 V in acetonitrile.

    DOI: 10.1246/CL.1993.271

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  • Corrosion of Iron in Anhydrous Acetonitrile Solutions of Some Carboxylic Acids Reviewed

    K. Aramaki, K. Shimizu, M. Sakakibara, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   140   1561 - 1567   1993

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    DOI: 10.1149/1.2221602

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  • Poly(arylene cobaltacyclopentadienylene)s: A New Class of Organometallic -Conjugated Conducting Polymers Reviewed

    H. Nishihara, T. Shimura, A. Ohkubo, N. Matsuda, K. Aramaki

    ADVANCED MATERIALS   5   752 - 754   1993

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    DOI: 10.1002/ADMA.19930051016

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  • Photoelectric Properties of Metallocene Redox Diodes.H. Nishihara, K. Sakamoto, H. Motohashi, K. Aramaki Reviewed

    H. Nishihara, K. Sakamoto, H. Motohashi, K. Aramaki

    Denki Kagaku   61   883 - 884   1993

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  • Fabrication of a Polymer Trilayer Structure Acting as a Photoelectric Cell at Interdigitated Array Microelectrodes Reviewed

    K. Sakamoto, K. Aramaki, H. Nishihara

    CHEMISTRY LETTERS   22 ( 4 )   659 - 662   1993

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  • Non-linear Electric Properties of Polyaniline Doped with Organic Acceptors Reviewed

    T. Ohsawa, T. Kabata, O. Kimura, S. Nakajima, H. Nishihara, K. Yoshino

    SYNTHETIC METALS   57   4842 - 4847   1993

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  • ポリアニリン/有機アクセプター錯体の作成及びその電気的特性 Reviewed

    大澤利幸, 加幡利幸, 西原 寛, 吉野勝美

    信学技報   93-13   9 - 14   1993

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  • The Effects of Complexing Agents on the Corrosion of Iron in an Anhydrous Methanol Solution Reviewed

    M. Sakakibara, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   34 ( 12 )   1937 - 1946   1993

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  • Electrochemical Properties of an Electrosynthesized Poly(p-phenylene vinylene) Film and its Application to a Simple Electrochemical Fabrication of a Polymer Diode Reviewed

    H. Nishihara, M. Akasaka, M. Tateishi, K. Aramaki

    CHEMISTRY LETTERS   21 ( 10 )   2061 - 2064   1992

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    Cyclic voltammetry of a poly(p-phenylene vinylene) (PPV) film prepared by electrochemical reduction of α,α,α′,α′-tetrabromo-p-xylene at Pt in THF shows an oxidation wave at ca. +0.8 V and a reduction wave at ca. −1.8 V vs. Ag/Ag+ in 1 mol dm−3 n-Bu4NBF4-MeCN. A polymer diode comprising cathodically polymerized PPV and anodically polymerized polypyrrole (PPy) can be fabricated by the simple one-pot electrochemical procedure.

    DOI: 10.1246/CL.1992.2061

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  • Electrochemical Synthesis of Soluble Poly(n-alkylphenylene)s Reviewed

    T. Shimura, H. Funaki, H. Nishihara, K. Aramaki, T. Ohsawa, K. Yoshino

    CHEMISTRY LETTERS   21 ( 3 )   457 - 460   1992

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  • A Novel Intramolecular Metallacycle-phosphine Reaction of an Electrochemically Oxidized Cobaltacyclopentadiene Complex Reviewed

    A. Ohkubo, T. Fujita, S. Ohba, K. Aramaki, H. Nishihara

    CHEMICAL COMMUNICATIONS   1992   1553 - 1555   1992

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    DOI: 10.1039/C39920001553

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  • Synthesis and Electrochemical Characterization of Bis(fulvalene)diiron Electrode Films Reviewed

    K. Sakamoto, H. Nishihara, K. Aramaki

    DALTON TRANSACTIONS   1992   1877 - 1882   1992

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    DOI: 10.1039/DT9920001877

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  • A Persistent Corrosion-Protective Film Formed on Iron in Acid Solutions with Triethylbismuthine Reviewed

    M. Ihara, N. Saito, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   33 ( 3 )   389 - 401   1992

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  • Inhibition Mechanism of Sodium 3-Octylmercaptopropionate for Iron Corrosion in 0.5 M NaCl Solution Reviewed

    Y. Yamamoto, H. Nishihara, K. Aramaki

    CORROSION   48 ( 8 )   641 - 648   1992

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    DOI: 10.5006/1.3315984

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  • Mechanism of Corrosion Inhibition with Bismuth Compounds for Iron, Nickel and Zinc in Acid Solutions Reviewed

    M. Ihara, H. Nishihara, K. Aramaki

    Denki Kagaku   60   500 - 507   1992

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  • A Novel π-Conjugated Organometallic Polymer, Molybdemum Tricarbonyl Modified Poly(n-hexylphenylene) Reviewed

    H. Funaki, K. Aramaki, H. Nishihara

    CHEMISTRY LETTERS   21 ( 10 )   2065 - 2068   1992

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    Electrochemical and electrical properties of soluble poly(n-hexylphenylene) bound to Mo(CO)3 were investigated by cyclic voltammetry, spectro-electrochemistry and four-electrode voltammetry. Oxidation of the Mo complex polymer occurs at E0′ = 0.51 V vs. Ag/Ag+, which is less positive than that of free poly(n-hexylphenylene) by ca. 0.3 V. At this potential, conductivity of the Mo complex polymer increases. The band gap of the polyphenylene does not change significantly by coordinating to Mo.

    DOI: 10.1246/CL.1992.2065

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  • Synthesis of Deeply Colored Soluble Polyacetylenes from 1-Ethynylnaphthalene and 3,6-Dibutyl-9-ethynylphenanthrene Reviewed

    M. Yamaguchi, M. Hirama, H. Nishihara

    CHEMISTRY LETTERS   21 ( 9 )   1667 - 1668   1992

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    Deeply colored soluble polyacetylenes were synthesized from 1-ethynylnaphthalene and 3,6-dibutyl-9-ethynylphenanthrene by employing a tungsten (IV) catalyst. Since 2-ethynylnaphthalene gave the less conjugated polymer, connection mode of the aromatic pendants was found to be essential for maintaining the conjugated structure of the polyene chain. Electrochromic properties of poly(1-ethynylnaphthalene) were also studied.

    DOI: 10.1246/CL.1992.1667

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  • The Mechanism for Corrosion Protective Film Formation on Iron and Nickel in Acid Solutions with Organoantimony Compounds Reviewed

    N. Saito, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   33 ( 8 )   1253 - 1265   1992

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  • The Inhibition of Iron Corrosion in Acid Solutions Using Bismuth (III) Chloride Reviewed

    M. Ihara, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   33 ( 8 )   1267 - 1278   1992

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  • Electrochemical and Electrical Properties of a Mixed-Valence Bis(fulvalene)diiron Salt in Polyethylene Glycol Studied Using an Interdigitated Array Microelectrode Reviewed

    H. Nishihara, M. Ohta, K. Aramaki

    J. Chem. Soc., Faraday Trans.   88   827 - 831   1992

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    DOI: 10.1039/FT9928800827

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  • Permeability of n-Alkanethiolate Monolayers Adsorbed on Copper Surfaces to Cobaltocenium Ion from Acetonitrile Solutions Reviewed

    H. Nishihara, H. Yanagawa, Y. Yamamoto, K. Aramaki

    Denki Kagaku   60 ( 12 )   1117 - 1122   1992

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  • SOLID-STATE REDOX DIODE COMPOSED OF AN ELECTROPOLYMERIZED METALLOCENE LAYER AND A POLYMER ELECTROLYTE LAYER CONTAINING A REDOX COUPLE IN A MIXED-VALENT STATE Reviewed

    H NISHIHARA, H ASAI, K ARAMAKI

    JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS   87 ( 11 )   1771 - 1777   1991.6

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  • Surface Enhanced Raman Scattering Spectra of Pyridine Adsorbed on Nickel Reviewed

    K. Aramaki, M. Yamada, J. Uehara, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   138   3389 - 3393   1991

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    DOI: 10.1149/1.2085418

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  • The Formation of a Highly Protective and Persistent Film against Iron Corrosion in Acid Solutions with Triethylstibine Reviewed

    N. Saito, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   32 ( 5 )   577 - 591   1991

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  • Doping Reaction at the Interface between Polyaniline and Solid State Polymer Electrolytes Reviewed

    T. Ohsawa, S. Yoneyama, T. Kabata, H. Nishihara, K. Aramaki, K. Yoshino

    SYNTHETIC METALS   43   4021 - 4024   1991

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  • Interdigitated Array Electrode Diffusion Measurements in Donor-Acceptor Solutions in Polyether Electrolyte Solvents Reviewed

    H. Nishihara, F. Dalton, R. W. Murray

    ANALYTICAL CHEMISTRY   63   2955 - 2960   1991

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    DOI: 10.1021/AC00024A028

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  • Automatic Doping of Polyaniline with Organic Electron Acceptors Reviewed

    T. Ohsawa, H. Nishihara, K. Aramaki, K. Yoshino

    CHEMISTRY LETTERS   20 ( 10 )   1707 - 1710   1991

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    Complexes of polyaniline (PANI) with various organic π-electron acceptors such as benzoquinones were prepared by the automatic doping method. Relation of their electrical, electrochemical and spectroscopic properties to the strength in electron affinity of the acceptors were revealed.

    DOI: 10.1021/AC00024A028

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  • Electrochemical and Electrical Properties of Carbonaceous Films Formed by Electroreduction of Perhalogenocarbons Reviewed

    H. Nishihara, K. Ohashi, S. Kaneko, F. Tanaki, K. Aramaki

    SYNTHETIC METALS   42   1495 - 1499   1991

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  • New Approach to Graphite Synthesis. Electrochemical Carbonization of Hexachlorobuta-1,3-diene Reviewed

    H. Nishihara, H. Harada, M. Tateishi, K. Ohashi, K. Aramaki

    J. Chem. Soc., Faraday Trans.   87   1187 - 1192   1991

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    DOI: 10.1039/FT9918701771

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  • Relationship between the HSAB principle and Effects of Various Anions and a Tetra-n-butylammonium Ion on Passive Film of Iron in a Borate Buffer Solution Reviewed

    K. Aramaki, T. Mochizuki, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   138   394 - 398   1991

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    DOI: 10.1149/1.2085596

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  • Electrochemical and Electrical Properties of Poly(hexachlorobuta-1,3-diene), an Electrochemically Graphitized Film Reviewed

    H. Nishihara, H. Harada, S. Kaneko, M. Tateishi, K. Aramaki, R. W. Murray

    J. Chem. Soc., Faraday Trans.   87   319 - 324   1991

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    DOI: 10.1039/FT9918700319

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  • 金属および金属酸化物への陰イオンの吸着と硬い酸および軟かい酸塩基の法則の関連性 Reviewed

    荒牧国次, 西原 寛

    材料と環境   40   608 - 616   1991

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  • Surface Enhanced Raman Scattering and Impedance Studies on the Inhibition of Copper Corrosion in Sulphate Solution by 5-Substituted Benzotriazoles Reviewed

    K. Aramaki, T. Kiuchi, T. Sumiyoshi, H. Nishihara

    CORROSION SCIENCE   32   593 - 607   1991

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  • A MECHANISTIC STUDY OF THE OXIDATIVE ADDITION-REACTION OF BENZYL THIOCYANATE AT IRON, NICKEL, AND ZINC SURFACES IN SULFURIC-ACID Reviewed

    T SUZUKI, H NISHIHARA, K ARAMAKI

    LANGMUIR   6 ( 4 )   816 - 821   1990.4

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  • Electrochemical Olefin Epoxidation with Manganese meso-Tetraphenylporphyrin Catalyst and Hydrogen Peroxide Generation at Polymer Coated Electrode Reviewed

    H. Nishihara, K. Pressprich, R. W. Murray, J. P. Collman

    INORGANIC CHEMISTRY   29   1000 - 1006   1990

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    DOI: 10.1021/IC00330A020

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  • Electrocatalytic Synthesis of a Cobaltocenium/ferrocene Bilayder-like Film Acting as a Solid State Diode Reviewed

    Y. Ando, H. Nishihara, K. Aramaki

    CHEMISTRY LETTERS   19   1399 - 1402   1990

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    DOI: 10.1246/CL.1990.1399

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  • SERS and Impedance Study of the Equilibrium between Complex Formation and Adsorption of Benzotriazole and 4-Hydroxybenzotriazole on a Copper Electrode in Sulphate Solution Reviewed

    R. Youda, H. Nishihara, K. Aramaki

    ELECTROCHIMICA ACTA   35   1011 - 1017   1990

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  • An Investigation on Adsorption and Orientation of Some Nitrogen Compounds at Iron Surface in an Acid Solution by Surface Enhanced Raman Scattering Spectroscopy Reviewed

    J. Uehara, H. Nishihara, K. Aramaki

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   137 ( 9 )   2677 - 2683   1990

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    DOI: 10.1149/1.2087009

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  • The Protection of Iron Corrosion with Polymer Films Prepared by Cathodic Polymerization of Halogenated Xylenes Reviewed

    H. Ohno, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   30   603 - 615   1990

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  • Synthesis of Graphite Films by Electrochemical Reduction of Hexachlorobuta-1,3-diene Reviewed

    H. Nishihara, H. Harada, S. Kaneko, M. Tateishi, K. Aramaki

    CHEMICAL COMMUNICATIONS   1990   26 - 27   1990

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    DOI: 10.1039/C39900000026

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  • Adsorption and Corrosion Inhibition Effect of Polar Organic Compounds on Iron in 1 M HClO4 Containing SH- Reviewed

    K. Aramaki, Y. Node, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   137 ( 5 )   1354 - 1358   1990

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    DOI: 10.1149/1.2086673

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  • Charge-transfer Complex Formation Promoted by an Electric Field at the Interface of a Ferrocene-Cobaltocenium Bilayer Film Reviewed

    Y. Ando, H. Nishihara, K. Aramaki

    CHEMICAL COMMUNICATIONS   1989   1430 - 1432   1989

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    DOI: 10.1039/C39890001430

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  • Impedance Study on Inhibition and Stimulation of Iron Corrosion in Acid Solution by Various Inorganic Anions and Tetraalkylammonium Cation Reviewed

    K. Aramaki, M. Hagiwara, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   135   1364 - 1369   1988

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    DOI: 10.1149/1.2095988

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  • Effect of Chloride Ion on the Relationship between Adsorption of Polar Organic Compounds on Nickel or Iron and the HSAB Principle Reviewed

    K. Aramaki, T. Mochizuki, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   135 ( 10 )   2427 - 2432   1988

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    DOI: 10.1149/1.2095352

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  • A Study on the Oxidative-Addition Reaction of Benzyl Compounds in Sulphric Acid and Its Relation to Corrosion Inhibition Reviewed

    T. Suzuki, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   28   343 - 352   1988

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  • A SERS Study of Inhibition Mechanism of Benzotriazole and Its Derivatives for Copper Corrosion in Sulphate Solutions Reviewed

    R. Youda, H. Nishihara, K. Aramaki

    CORROSION SCIENCE   28   87 - 96   1988

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  • SYNTHESIS OF FERROCENE AND COBALTOCENE ELECTRODE FILMS BY ELECTROPOLYMERIZATION AND THEIR SPECTRAL AND ELECTROCHEMICAL PROPERTIES Reviewed

    H NISHIHARA, M NOGUCHI, K ARAMAKI

    INORGANIC CHEMISTRY   26 ( 17 )   2862 - 2867   1987.8

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  • AC IMPEDANCE STUDIES ON RELATIONSHIP BETWEEN ADSORPTION BEHAVIOR OF POLAR ORGANIC-COMPOUNDS ON ANODICALLY POLARIZED NICKEL AND THE HSAB PRINCIPLE Reviewed

    K ARAMAKI, H NISHIHARA

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   134 ( 5 )   1059 - 1064   1987.5

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  • Preparation and Properties of Poly(p-phenylene) and Poly(9,10-anthrylene) Films by Using a Composite Electrolyte Composed of LiAsF6 and NiCl2[P(allyl)2Ph]2 Reviewed

    T. Ohsawa, H. Nishihara, K. Aramaki, S. Takeda, K. Yoshino

    Polymer Commun.   28   628 - 629   1987

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  • Adsorption and Corrosion Inhibition Effect of Anions plus an Organic Cation on Iron in 1 M HClO4 and the HSAB Principle Reviewed

    K. Aramaki, M. Hagiwara, H. Nishihara

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   134 ( 8 )   1896 - 1901   1987

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    DOI: 10.1149/1.2100785

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  • The Synergistic Effect of Anions and the Ammonium Cation on the Inhibition of Iron Corrosion in Acid Solution Reviewed

    K. Aramaki, M. Hagiwara, H. Nishihara

    CORROSION SCIENCE   27 ( 5 )   487 - 497   1987

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  • Charge-Transfer Kinetics for Reduction of Organic Redox Species at Poly[1,1’-bis(chloromethyl)ferrocene]-coated Electrodes Reviewed

    H. Nishihara, Y. Shimano, K. Aramaki

    JOURNAL OF PHYSICAL CHEMISTRY   91   2918 - 2921   1987

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    DOI: 10.1021/J100295A053

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  • Electrochemical Synthesis of Poly(p-phenylene xylylidene), a New Electrically Conducting Polymer Reviewed

    M. Tateishi, H. Nishihara, K. Aramaki

    CHEMISTRY LETTERS   16 ( 9 )   1727 - 1728   1987

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    Electroreduction of α,α,α,α′,α′,α′-hexachloro-p-xylene at a copper electrode in n-Bu4NBF4-propylene carbonate gave a free-standing film of poly(p-phenylene xylylidene), PPX, a new conducting polymer with phenylenic and acetylenic backbones. The PPX film exhibited a conductivity of 70 S cm−1 on doping with SO3.

    DOI: 10.1246/CL.1987.1727

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  • A Chemical Diode by Combination of Ferrocene and Cobalticinium Electrode Films Reviewed

    H. Nishihara, M. Noguchi, K. Aramaki

    CHEM COMMUN   1987   628 - 629   1987

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    DOI: 10.1039/C39870000628

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  • 電解重合膜被覆による中性水溶液中の鉄の腐食抑止 Reviewed

    大野博樹, 西原 寛, 荒牧国次

    防食技術   36   361 - 367   1987

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  • Electrochemical Synthesis of Poly(p-pheylene vinylene) Films Reviewed

    H. Nishihara, M. Tateishi, K. Aramaki, T. Ohsawa, O. Kimura

    CHEM LETT   16 ( 3 )   539 - 542   1987

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    Electroreduction of α,α,α′,α′-tetrabromo-p-xylene at an indium tin oxide (ITO), platinum, copper or nickel electrode in ethereal solution afforded a thick and uniform poly(p-phenylene vinylene) film in the undoped state. Addition of Cr(CO)6 or Mo(CO)6 accelerated the film growth at the ITO electrode.

    DOI: 10.1246/CL.1987.539

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  • COBALTOCENE ELECTRODE FILMS PREPARED BY ELECTROPOLYMERIZATION OF [CO(C5H4CCL=CHCHO)2]PF6 Reviewed

    H NISHIHARA, K ARAMAKI

    CHEMISTRY LETTERS   ( 7 )   1063 - 1064   1986.7

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  • 交流インピーダンス法による1 N-H2SO4中の鉄腐食に及ぼすアミン類とKIの相乗抑制作用の研究 Reviewed

    志村和美, 西原 寛, 荒牧国次

    防食技術   35   599 - 605   1986

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  • Adsorption of Polar Organic Compounds on Oxidized Iron Surface and the HSAB Principle Reviewed

    K. Higashi, H. Nishihara, K. Aramaki

    Boshoku Gijutsu   34 ( 11 )   599 - 605   1985

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    Inhibition efficiencies of polar organic compounds for the corrosion of various metals in acid solutions are related to the hard and soft acids and bases principle (HSAB principle). Since a bulk metal is classified to a soft acid, the compound acting as a soft base is more readily chemisorbed on surface of the metal than that of a hard base, resulting in the higher inhibition efficiency. In this paper, effect of the polar organic compounds on current densities of Fe electrode in active and passive region of anodic polarization curves and amount of the compounds adsorbed on &gamma;-Fe2O3 powder are discussed on the basis of the HSAB principle. The compounds, (n-C4H9)3X (X=N, P, As, and Sb) were used as the inhibitors. The polatization measurements were carried out on 99.99% Fe in deaerated 3.0M HClO4 and boric-borate buffer (pH 8.45) at 30&deg;C. The surface coverages of the compounds were obtained on the powder of 99.9% &gamma;-Fe2O3 in methanol by HPLC. The inhibitor acting as the soft base was effective for the dissolution of Fe in HClO4 than that of the hard base, indicating the agreement with the previous results. The passive current density of Fe electrode in the buffer solution decreased by the addition of R3N and R3P while increased by the addition of R3As and R3Sb. This result suggested that the compound classified to the hard base was adsorbed on the oxidized Fe surface acting as the hard acid to more extent than that classified to the soft base. The compound of the hard base was readily chemisorbed on the surface of &gamma;-Fe2O3 powder acting as the hard acid. The adsorption behavior of the polar organic compounds on the oxidized Fe surface was concluded to be closely related to the HSAB principle.

    DOI: 10.3323/jcorr1974.34.11_599

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  • IRREVERSIBLE CHARGE-TRANSPORT THROUGH FILMS OF ELECTROPOLYMERIZED 1,1'-BIS(CHLOROMETHYL)FERROCENE Reviewed

    H NISHIHARA, K ARAMAKI

    JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS   ( 11 )   709 - 710   1985

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  • Reaction of [W(N2)2(dpe)2] with HFeCo3(CO)12 in Aqueous and Halogenated Solvents to Form Hydrazido(2-) Hydroxo Complexes of Tungsten(IV) and Dihalo Complexes of Tungsten(III), Crystal Structure of [WCl2(dpe)2]BF4•1/3CH2Cl2 Reviewed

    M. Imaeda, H. Nishihara, K. Nakano, H. Ichida, A. Kobayashi, T. Saito, Y. Sasaki

    INORG CHEM   24   1246 - 1250   1985

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    DOI: 10.1021/IC00202A028

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  • Inhibition Effects of Cyclopentadiene Derivatives on the Iron Corrosion in Sulfuric Acid Reviewed

    H. Nishihara, K. Aramaki

    Boshoku Gijutsu   34 ( 10 )   541 - 545   1985

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    Inhibition effects of cyclic dienes and triens on the iron corrosion in 1N sulfuric acid were investigated by polarization measurements. Cyclopentadiene and its derivatives, indene and fluorene showed strong inhibition effects even at low concentrations. The inhibition efficiency of indene at 10-6M was 82%. Polarization curves suggested the formation of stable iron-&eta;5-cyclopentadienyl bonds by the oxidative-addition reaction on the surface. Inhibition efficiency of indene increased gradually with time, while that of 1, 3-cyclooctadiene decreased. The amounts of above two compounds consumed on the iron surface were larger than those used for the monolayer coverage. These results suggested that the polymerization reaction played a significant role in addition to the formation of the stable iron-&eta;5-indenyl bond for the large inhibition effect of indene.

    DOI: 10.3323/jcorr1974.34.10_541

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  • “Oxidative-Addition” Inhibitors - Inhibition Effect of Benzyl Halide on the Iron Corrosion in Acid Solution Reviewed

    H. Nishihara, K. Aramaki

    Boshoku Gijutsu   33   493 - 499   1984

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  • A New Approach to Nitrogen Fixation.Protonation of Dinitrogen Ligand by means of Hydridometal Carbonyls and the Synthesis of Alkoxide Hydrazido(2-) Complexes of Tungsten with Iron and Cobalt Carbonyl Complex Anions Reviewed

    H. Nishihara, T. Mori, Y. Tsurita, K. Nakano, T. Saito, Y. Sasaki

    J AM CHEM SOC   94   4367 - 4372   1982

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    DOI: 10.1021/JA00380A010

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  • Synthesis of Tungsten Alkoxy-Hydrazido(2-) Complexes with Transition Metal Carbonyl Complex Anion Reviewed

    H. Nishihara, T. Saito, Y. Sasaki

    CHEM LETT   10 ( 4 )   451 - 452   1981

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    The dinitrogen complex trans-[W(N2)2(dpe)2] (dpe = 1,2-bis(diphenylphosphino)ethane) reacted with HCo(CO)4 or HFeCo3(CO)12 in the presence of alcohols to give alkoxy-hydrazido(2−) complexes, [W(OR)(NNH2)(dpe)2]+[A] (A = Co(CO)4, R = CH3, C2H5; A = Co3(CO)10, R = CH3; A = FeCo3(CO)12, R = CH3, C2H5, n-C3H7).

    DOI: 10.1246/CL.1981.451

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  • Reduction of Coordinated Dinitrogen in cis-W(N2)2(PMe2Ph)4 by means of Acidic1980 Hydridometal Carbonyls Reviewed

    H. Nishihara, T. Mori, T. Saito, Y. Sasaki

    CHEM LETT   9   667 - 668   1980

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    DOI: 10.1246/CL.1980.667

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  • Metal Atom Synthesis of syn(1-3--But-2-enyl)(-buta-1,3-diene)-(triethylphosphine)cobalt Reviewed

    H. Nishihara, M. Fujita, H. Takahashi, T. Saito, Y. Sasaki

    Transition Met. Chem.   5   98 - 101   1980

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    DOI: 10.1007/BF01396880

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  • Redox Properties of Hepta(1,1’-dihexylferrocenylene) Reviewed

    H. Nishihara, T. Hirao, K. Aramaki, K. Aoki

    SYNTHETIC METALS   84   935 - 936   1977

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  • Welcome to PRiME 2016 Reviewed

    Krishnan Rajeshwar, Hiroshi Nishihara, Yongkeun Son

    ELECTROCHEMICAL SOCIETY INTERFACE   25 ( 3 )   31 - 31   1970.1

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Books

  • 化学の要点シリーズ44 金属錯体の二次元物質 配位ナノシート

    前田啓明、福居直哉、髙田健司、西原 寛( Role: Joint author)

    共立出版  2023.10  ( ISBN:9784320044852

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  • 教養の化学ー生命・環境・エネルギー

    伊藤眞人、一本松正道、小木知子、黒田智明、小林憲正、西原祥子、中田宗隆、西田昌司、西原 寛、堀井明、薬袋佳孝、山口雅彦( Role: Joint editor)

    東京化学同人  2023.3  ( ISBN:9784807920419

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  • 教養の化学: 生命・環境・エネルギー

    西原 寛、中田宗隆、一本松正道、伊藤眞人、小木知子、黒田智明、小林憲正、西田昌司、西原祥子、堀井 明、薬袋佳孝、山口雅彦( Role: Edit)

    東京化学同人  2023.3  ( ISBN:9784807920419

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  • Inorganic Photochemistry; in Comprehensive Inorganic Chemistry III

    H. Maeda, M. Nishikawa, R. Sakamoto, H. Nishihara( Role: Joint author)

    Oxford: Elsevier  2023.3  ( ISBN:9780128231449

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  • フロンティア「機能高分子金属錯体」

    西原 寬、山元公寿 編著( Role: Joint editor)

    三共出版  2020.6  ( ISBN:9784782707913

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  • Proton-coupled intramolecular electron transfer in ferrocene-quinone conjugated oligomers and polymers

    Macromolecules Containing Metal and Metal-Like Elements, Wiley InterScience  2003 

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  • 光やプロトンに応答するレドックス錯体

    「集積型金属錯体の科学」(大川尚士、伊藤 翼編), 化学同人  2003 

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  • Redox Chemistry and Functionalities of Conjugated Ferrocene Systems

    Adv. Inorg. Chem.  2002 

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  • 異なる物質間の相性

    相性(東京大学出版会)  2001 

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  • Organometallic Conductive Polymers.

    Handbook of Organic Conductive Molecules and Polymers, wiley  1997 

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MISC

  • Layered metal-organic frameworks and metal-organic nanosheets as functional materials

    Ryota Sakamoto, Naoya Fukui, Hiroaki Maeda, Ryojun Toyoda, Shinya Takaishi, Tappei Tanabe, Joe Komeda, Pilar Amo-Ochoa, Félix Zamora, Hiroshi Nishihara

    Coordination Chemistry Reviews   472   2022.12

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    DOI: 10.1016/j.ccr.2022.214787

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  • 東レ科学振興会創立60周年特別企画 子どもたちの心を揺さぶる科学の教材-東レ理科教育賞

    西原 寬、

    日経サイエンス   2021 ( 4 )   0 - 1   2021.4

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  • 新型コロナウィルスと化学教育

    西原 寛

    化学と教育   68 ( 8 )   317 - 317   2020.8

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  • 結晶多形をとるジシラン化合物の固体NMRスペクトル

    服部峰之, 治村圭子, 林繁信, 西尾正樹, 尾本賢一郎, 島田真樹, 前田啓明, 宮地麻里子, 山野井慶徳, 西原寛

    Abstracts. Annual Meeting of the NMR Society of Japan   58th (CD-ROM)   2019

  • Bottom-up Coordination Nanosheets Applicable for Electronics and Spintronics

    67 ( 5 )   385 - 390   2016.5

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  • Luminescent properties of an open-shell organic radical with high photostability

    Tetsuro Kusamoto, Yohei Hattori, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   249   2015.3

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  • Fluorescence of a gold(I) complex with a stable fluorescent organic radical ligand

    Yohei Hattori, Tetsuro Kusamoto, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   249   2015.3

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  • Molecular wires

    D. M. Guldi, H. Nishihara, L. Venkataraman

    CHEMICAL SOCIETY REVIEWS   44   842 - 844   2015

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    DOI: 10.1039/C5CS90010G

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  • New talent: Asia-Pacific

    H. Nishihara

    DALTON TRANSACTIONS   44   15074   2015

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    DOI: 10.1039/c5dt90147b

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  • Functional "Bottom-up" Metal Complex Nanosheets

    65 ( 12 )   944 - 948   2014.12

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  • 非対称ジピリン銅およびニッケル錯体の合成

    豊田良順, 土屋瑞穂, 服部陽平, 松岡亮太, 坂本良太, 西原寛

    錯体化学会討論会講演要旨集   64th   2014

  • pi-Conjugated Nickel Bis(dithiolene) Complex Nanosheet

    Tetsuya Kambe, Ryota Sakamoto, Ken Hoshiko, Kenji Takada, Mariko Miyachi, Ji-Heun Ryu, Sono Sasaki, Jungeun Kim, Kazuo Nakazato, Masaki Takata, Hiroshi Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   135 ( 7 )   2462 - 2465   2013.2

  • Coordination programming: science of molecular superstructures towards chemical devices

    H. Nishihara, H. Oshio

    DALTON TRANSACTIONS   42   15825   2013

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    DOI: 10.1039/C3DT90157B

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  • 130年かかった夢の化合物 : ペックマン色素の新構造異性体を合成

    坂本 良太, 林 幹大, 西原 寛

    化学   67 ( 1 )   39 - 44   2012.1

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  • Coordination programming of electrofunctional molecular wires on the surface

    Hiroshi Nishihara, Hiroaki Maeda, Ryota Sakamoto, Yoshihiko Nishimori, Junya Sendo, Toshimitsu Fumiyuki, Yoshinori Yamanoi

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   242   2011.8

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  • Surface Coordination Programming of π-Conjugated Metal Complex Polymers

    NISHIHARA Hiroshi

    60 ( 7 )   445 - 448   2011.7

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  • Pt(II) complex with TEMPO-dithiolate ligand: Realization of an interesting electronic structure through SOMO-HOMO level conversion

    Tetsuro Kusamoto, Shoko Kume, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   237   2009.3

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  • Biography of Professor Takakazu Yamamoto

    H. Nishihara

    Journal of Inorganic and Organometallic Polymers and Materials   19   1 - 2   2009

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    DOI: 10.1007/s10904-009-9255-y

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  • Construction of Switching Devices Using Photochromic Metal Complexes

    KUME Shoko, KANAIZUKA Katsuhiko, NISHIHARA Hiroshi

    50 ( 4 )   345 - 349   2008.6

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  • INOR 179-Control of the electronic structures based on a tempo-functionalized ligand and its platinum complex

    Tetsuro Kusamoto, Shoko Kume, Hiroshi Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   235   2008.4

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  • 生体系光受容体を用いた光電変換のための錯体分子連結系の構築

    宮地麻里子, 山野井慶徳, 米澤徹, 西原寛, 岩井道直, 今野雅恵, 岩井雅子, 井上康則

    錯体化学討論会講演要旨集   58th   2008

  • Control of the coordination environments and the luminescence properties of the Eu^<3+> complexes by counter-anions

    WADA Atsushi, WATANABE Masayuki, YAMANOI Yoshinori, NISHIHARA Hiroshi

    ( 50 )   80 - 81   2007.5

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  • Visible light photochromism of bis(ferrocenylethynyl)ethenes to switch electronic communication between ferrocene sites

    Hiroshi Nishihara, Ryota Sakamoto, Shoko Kume

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   233   396 - 396   2007.3

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  • Metal-based Photoswitches Derived from Photoisomerization

    KUME Shoko, NISHIHARA Hiroshi

    Photochemistry   37 ( 1 )   17 - 22   2006.6

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  • Synthesis of heterometal cluster complexes by the reaction of cobaltadichalcogenolato complexes with groups 6 and 8 metal carbonyls

    Masaki Murata, Satoru Habe, Shingo Araki, Kosuke Namiki, Teppei Yamada, Norikiyo Nakagawa, Takuya Nankawa, Masayuki Nihei, Jun Mizutani, Masato Kurihara, Hiroshi Nishihara

    Inorganic Chemistry   45 ( 3 )   1108 - 1116   2006.2

  • Thermochromic triangular [MCo2] (M = Rh, Ir, Ru) clusters containing a planar metalladithiolene ring in η3 coordination

    Norikiyo Nakagawa, Teppei Yamada, Masaki Murata, Manabu Sugimoto, Hiroshi Nishihara

    Inorganic Chemistry   45 ( 1 )   14 - 16   2006.1

  • Synthesis, Crystal Structures and Photophysical Properties of Lanthanide Complexes with Novel Octadentate Oligopyridine Ligands

    WADA Atsushi, WATANABE Masayuki, YAMANOI Yoshinori, MURATA Masaki, NAMIKI Kosuke, NISHIHARA Hiroshi

    46   96 - 97   2005.5

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  • 光合成システムI-ナノ粒子バイオ共役ナノマテリアルの再構成

    米沢徹, 山野井慶徳, 森山佳則, 西原寛, 藤利彰彦, 佐藤幾太郎, 井上康則, 寺崎正, 山本典孝, 玉田薫, 平賀隆, 米山賢史, 皆方誠, 大森努, 酒井誠, 藤井正明

    ナノ学会大会講演予稿集   3rd   2005

  • 光合成たんパく質複合体を利用した新規人工光電変換システムへのアプローチ

    山野井慶徳, 森山佳則, 水野克哉, 米沢徹, 西原寛, 藤利彰彦, 佐藤幾太郎, 井上康則, 寺崎正, 山本典孝, 玉田薫, 平賀隆, 米山賢史, 皆方誠, 大森努, 酒井誠, 藤井正明

    Review of Polarography   51 ( 3 )   2005

  • 光合成タンパク質複合体(PSI)をナノ部品とするバイオ共役ナノマテリアルの固定化と光電流応答

    寺崎正, 山本典孝, 玉田薫, 平賀隆, 藤利彰彦, 佐藤幾太郎, 井上康則, 山野井慶徳, 米沢徹, 森山佳則, 西原寛, 米山賢史, 皆方誠, 大森努, 酒井誠, 藤井正明

    ナノ学会大会講演予稿集   3rd   2005

  • Preparation and Characterization of Bio-conjugated Photosensing Nanomaterials: Synthesis of molecular wires and reconstruction of photo system I (PSI) using them

    山野井慶徳, 森山佳則, 米沢徹, 西原寛, 藤利彰彦, 佐藤幾太郎, 井上康則, 寺崎正, 山本典孝

    日本化学会講演予稿集   85th ( 1 )   2005

  • Novel photoisomerization of azoferrocene with a low-energy MLCT band and significant change of the redox behavior between the cis- and trans-isomers (vol 122, pg 12373, 2000)

    M Kurihara, T Matsuda, A Hirooka, T Yutaka, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   126 ( 14 )   4740 - 4740   2004.4

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  • Synthesis and physical properties of pi-conjugated metallacycle polymers of cobalt and ruthenium

    M Kurashina, M Murata, H Nishihara

    MACROMOLECULAR SYMPOSIA   209   141 - 162   2004.3

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  • Synthesis, structures, and properties of lanthanide dinuclear complexes of tris(2-pyridyl)carbinol with a novel coordination mode.

    M Watanabe, T Nankawa, K Namiki, M Murata, T Kimura, A Nakamura, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U1437 - U1437   2004.3

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  • Solvent extraction of Am(III) and Eu(III) with tris(2-pyridyl)carbinol as nitrogen-donor ligand.

    K Ishimori, M Watanabe, T Kimura, M Murata, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U1275 - U1275   2004.3

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  • Synthesis of Azo-conjugated Catecholate Complexes and their Photo- and Proton-responses

    Sayoko Nagashima, Masayuki Nihei, Teppei Yamada, Masaki Murata, Masato Kurihara, Hiroshi Nishihara

    Macromolecular Symposia   204   93 - 101   2003.11

  • Photoluminescent dinuclear lanthanide complexes with tris(2-pyridyl)carbinol acting as a new tetradentate bridging ligand

    M Watanabe, T Nankawa, T Yamada, T Kimura, K Namiki, M Murata, H Nishihara, S Tachimori

    INORGANIC CHEMISTRY   42 ( 22 )   6977 - 6979   2003.11

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  • Synthesis of poly(biphenylene ruthenacyclopentatrienylene), a new organometallic conducting polymer with ferromagnetic interaction in its reduced state

    M Kurashina, M Murata, T Watanabe, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   125 ( 41 )   12420 - 12421   2003.10

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  • Photochemical behavior of azobenzene-conjugated Co-II, Co-III, and Fe-II bis(terpyridine) complexes

    T Yutaka, L Mori, M Kurihara, N Tamai, H Nishihara

    INORGANIC CHEMISTRY   42 ( 20 )   6306 - 6313   2003.10

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  • Novel intramolecular electron-transfer equilibrium in a spatially interaction binary system of a metal-free porphyrin and a ruthenium trichloro terpyridyl complex

    K Mizuno, M Kurihara, S Takagi, H Nishihara

    CHEMISTRY LETTERS   32 ( 9 )   788 - 789   2003.9

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  • Organometallic conducting polymers synthesized by metallacycling polymerization

    H Nishihara, M Kurashina, M Murata

    MACROMOLECULAR SYMPOSIA   196   27 - 38   2003.6

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  • Coordination-synchronized trans-cis photoisomerization of bipyridylazobenzene driven by a Cu(II)/Cu(I) redox change

    S Kume, M Kurihara, H Nishihara

    INORGANIC CHEMISTRY   42 ( 7 )   2194 - 2196   2003.4

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  • Synthesis of azo-conjugated metal ladithiolenes and their photo- and proton-responsive isomerization reactions

    M Nihei, M Kurihara, J Mizutani, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   125 ( 10 )   2964 - 2973   2003.3

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  • Synthesis of novel lanthanide complexes with quinone-containing ligands and their redox controlled magnetic interaction

    T Nankawa, M Watanabe, M Murata, H Nishihara

    CHEMISTRY LETTERS   32 ( 3 )   286 - 287   2003.3

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  • Synthesis and properties of tris(2-pyridine)carbinol lanthanide complexes

    M Watanabe, T Nankawa, T Yamada, T Kimura, A Nakamura, H Nishihara, S Tachimori

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   225   U43 - U43   2003.3

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  • Molecular structure and physical properties of lanthanide-quinone complexes

    T Nankawa, M Watanabe, M Murata, H Nishihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   225   U43 - U43   2003.3

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  • Synthesis, structure, and dissociation equilibrium of [Co(eta(5)-C5H5)(Se2C6H4)](2), a novel metalladiselenolene complex

    S Habe, T Yamada, T Nankawa, J Mizutani, M Murata, H Nishihara

    INORGANIC CHEMISTRY   42 ( 6 )   1952 - 1955   2003.3

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  • Electrodeposition of Biferrocene Derivative-Attached Gold Nanoparticles: Solvent Effects and Lithographic Assembly

    M. Yamada, H. Nishihara

    Langmuir   19(19), 8050-8056   8050 - 8056   2003

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    DOI: 10.1021/la034915d

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  • Electroreductive Deposition of Anthraquinone Derivative-Attached Au Clusters: Optical Properties and STM Observation of the Electrodeposited Cluster Film

    J. Phys. Chem. B   107, 3703-3711   2003

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  • Core size effects on electrodeposition of gold nanoparticles attached with biferrocene derivatives

    M. Yamada, H. Nishihara

    Eur. Phys. J. D   24, 257-260   257 - 260   2003

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    DOI: 10.1140/epjd/e2003-00101-2

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  • Photoluminescence switching of azobenzene-conjugated Pt(II) terpyridine complexes by trans-cis photoisomerization

    T Yutaka, Mori, I, M Kurihara, J Mizutani, N Tamai, T Kawai, M Irie, H Nishihara

    INORGANIC CHEMISTRY   41 ( 26 )   7143 - 7150   2002.12

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  • Photo- and protonation-induced changes in structures and physical properties of azo-conjugated metal complex systems

    H Nishihara, M Nihei, A Hirooka, M Kurihara

    MACROMOLECULAR SYMPOSIA   186   93 - 98   2002.8

  • Synthesis, structure, and DNA cleavage activity of new trinuclear Zn-3 and Zn2Cu complexes of a chiral macrocycle: Structural correlation with the active center of P1 nuclease

    Korupoju, SR, N Mangayarkarasi, PS Zacharias, J Mizuthani, H Nishihara

    INORGANIC CHEMISTRY   41 ( 16 )   4099 - 4101   2002.8

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  • Redox-conjugated reversible isomerization of ferrocenylazobenzene with a single green light

    M Kurihara, A Hirooka, S Kume, M Sugimoto, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   124 ( 30 )   8800 - 8801   2002.7

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  • Syntheses of new pyrimidine based compounds and their peculiar emission behaviors

    S Takagi, T Sahashi, K Sako, K Mizuno, M Kurihara, H Nishihara

    CHEMISTRY LETTERS   2002, 628-629 ( 6 )   628 - 629   2002.6

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  • Synthesis of ferrocene-quinone conjugated oligomers and polymers and their protonation-induced intramolecular electron-transfer reaction.

    H Nishihara, M Murata, K Kojima, T Fujita, K Kubo, M Kurihara

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   223   D94 - D94   2002.4

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  • Azo- and quinone-conjugated redox complexes - photo- and proton-coupled intramolecular reactions based on d-pi interaction

    M Kurihara, H Nishihara

    COORDINATION CHEMISTRY REVIEWS   226 ( 1-2 )   125 - 135   2002.3

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  • Preparation of alkanethiolate-protected palladium nanoparticles and their size dependence on synthetic conditions

    Quiros, I, M Yamada, K Kubo, J Mizutani, M Kurihara, H Nishihara

    LANGMUIR   18 ( 4 )   1413 - 1418   2002.2

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  • フォトクロミック金属錯体

    触媒   44 (5), 328-333   2002

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  • Electrochemical construction of an alternating multi-layered structure of palladium and gold nanoparticles attached with biferrocene moieties

    Mami Yamada, Hiroshi Nishihara

    Chemical Communications   8 ( 21 )   2578 - 2579   2002

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    DOI: 10.1039/b207513j

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  • A Large Trans/cis Conversion Ratio in Redox-conjugated Single-light Reversible Isomerization of a Cobalt Complex with meta-Bipyridylazobenzene Ligands

    S. Kume, M. Kurihara, H. Nishihara

    J. Korean Electrochem. Soc.   5(4), 189-191   189 - 191   2002

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  • Effects of alkyl chain as a spacer on electrochemical reaction and SEIRA spectra for self-assembled monolayers having anthraquinone redox center

    K Nishiyama, A Kubo, Taniguchi, I, M Yamada, H Nishihara

    ELECTROCHEMISTRY   69 ( 12 )   980 - 983   2001.12

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  • Synthesis of a new bis(ferrocenyl)ruthenacyclopentatriene compound with a significant inter-metal electronic communication

    Y Yamada, J Mizutani, M Kurihara, H Nishihara

    JOURNAL OF ORGANOMETALLIC CHEMISTRY   637   80 - 83   2001.12

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  • Structural conversion and spin separation in bis(ferrocenylethynyl)anthraquinones triggered by proton-coupled intramolecular electron transfer

    M Murata, M Yamada, T Fujita, K Kojima, M Kurihara, K Kubo, Y Kobayashi, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   123 ( 51 )   12903 - 12904   2001.12

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  • Photo- and proton-coupled isomerization of novel azo-conjugated platinadithiolene complex

    M Nihei, M Kurihara, J Mizutani, H Nishihara

    CHEMISTRY LETTERS   ( 9 )   852 - 853   2001.9

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  • Reversible trans-cis photoisomerization of azobenzene-attached bipyridine ligands coordinated to cobalt using a single UV light source and the Co(III)/Co(II) redox change

    S Kume, M Kurihara, H Nishihara

    CHEMICAL COMMUNICATIONS   ( 17 )   1656 - 1657   2001.9

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  • Synthesis, characterization, and photochemical properties of azobenzene-conjugated Ru(II) and Rh(III) bis(terpyridine) complexes

    T Yutaka, Mori, I, M Kurihara, J Mizutani, K Kubo, S Furusho, K Matsumura, N Tamai, H Nishihara

    INORGANIC CHEMISTRY   40 ( 19 )   4986 - 4995   2001.9

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    DOI: 10.1021/ic010351u

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  • Electroreductive deposition of anthraquinone derivative attached Au clusters: Optical properties and scanning tunneling microscopy observation of the electrodeposited cluster film

    M Yamada, T Tadera, K Kubo, H Nishihara

    LANGMUIR   17 ( 8 )   2363 - 2370   2001.4

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  • Redox and optical properties of conjugated ferrocene oligomers

    H Nishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   74 ( 1 )   19 - 29   2001.1

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  • Synthesis of a vinylene-bridged ferrocene-hydroquinone complex and its unusual structural change originated by proton-coupled electron transfer

    M Kurihara, H Sano, M Murata, H Nishihara

    INORGANIC CHEMISTRY   40 ( 1 )   4 - +   2001.1

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  • 金属錯体系のレドックス共役ナノ分子材料

    化学工業   52 ( 8 )   615 - 621   2001

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  • Preparation of palladium nanoparticles functionalized with biferrocene thiol derivatives and their electro-oxidative deposition

    M Yamada, Quiros, I, J Mizutani, K Kubo, H Nishihara

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   3 ( 16 )   3377 - 3381   2001

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  • Redox behavior of biferrocene dithiol and disulfide derivatives in SAMS with and without gold clusters on the gold substrate

    Y. Men, K. Kubo, M. Kurihara, H. Nishihara

    Physical Chemistry Chemical Physics   3 ( 16 )   3427 - 3430   2001

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    DOI: 10.1039/b101076j

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  • Formation of a novel porphyrin-gold nanoparticle network film induced by IR light irradiation

    M Yamada, A Kuzume, M Kurihara, K Kubo, H Nishihara

    CHEMICAL COMMUNICATIONS   2001(23), 2476-2477 ( 23 )   2476 - 2477   2001

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  • 機能性金属錯体への期待

    西原 寛

    化学と教育   49 ( 1 )   28 - 31   2001

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    Language:Japanese   Publisher:公益社団法人 日本化学会  

    その研究が20世紀に劇的に発展した金属錯体は, 新世紀を迎えて, さらに物理的特性を利用した機能性分子としての活躍が期待されている。その1例として, 代表的な遷移金属の有機金属錯体であり, 優れた電子授受機能をもつフェロセンを取り上げ, 他の機能分子・物質と組み合わせたときに, どのような物理機能を発現するかを述べる。具体的には, フェロセン共役分子, アゾフェロセン, ビフェロセン修飾金クラスターにふれる。

    DOI: 10.20665/kakyoshi.49.1_28

    CiNii Books

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  • Synthesis and redox properties of a pi-conjugated cyclobutadienecobalt polymer containing ferrocenyl groups

    M Murata, T Hoshi, Matsuoka, I, T Nankawa, M Kurihara, H Nishihara

    JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS   10 ( 4 )   209 - 219   2000.12

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  • Novel photoisomerization of azoferrocene with a low-energy MLCT band and significant change of the redox behavior between the cis- and trans-isomers

    M Kurihara, T Matsuda, A Hirooka, T Yutaka, H Nishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   122 ( 49 )   12373 - 12374   2000.12

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  • Novel protonation-induced structural conversion of an ethynylene-bridged ferrocene-anthraquinone complex

    M Murata, T Fujita, M Yamada, M Kurihara, H Nishihara

    CHEMISTRY LETTERS   ( 11 )   1328 - 1329   2000.11

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  • Novel photoisomerization behavior of Ph binuclear complexes involving an azobenzene-bridged bis(terpyridine) ligand. Strong effects of counterion and solvent and the induction of redox potential shift

    T Yutaka, M Kurihara, K Kubo, H Nishihara

    INORGANIC CHEMISTRY   39 ( 16 )   3438 - +   2000.8

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  • Electron transfer of conjugated polymeric ferrocenes

    M Kurihara, K Kubo, T Horikoshi, M Kurosawa, T Nankawa, T Matsuda, H Nishihara

    MACROMOLECULAR SYMPOSIA   156   21 - 27   2000.7

  • Synthesis and Physical Properties of a π-Conjugated Ruthenium((]G0002[))Dinuclear Complex Involving an Azobenzene-Bridged Bis(terpyridine)Ligand.

    T. Yutaka, M. Kurihara, H. Nishihara

    Mol. Cryst. Liq. Cryst.   343   193 - 198   2000

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    DOI: 10.1080/10587250008023525

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  • Electroreductive deposition of Au clusters modified with an anthraquinone derivative

    M Yamada, K Kubo, H Nishihara

    CHEMISTRY LETTERS   ( 12 )   1335 - 1336   1999.12

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  • Oxidative-decomposition and electron-transfer kinetics of self-assembled monolayers of biferrocene-terminated alkanethiol on gold

    K Kubo, H Kondow, H Nishihara

    ELECTROCHEMISTRY   67 ( 12 )   1129 - 1131   1999.12

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  • Synthesis of azo-bridged ferrocene oligomers and a polymer and electrochemical and optical analysis of internuclear electronic interactions in their mixed-valence states

    M Kurosawa, T Nankawa, T Matsuda, K Kubo, M Kurihara, H Nishihara

    INORGANIC CHEMISTRY   38 ( 22 )   5113 - 5123   1999.11

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  • Ferrocene in conjugation with a Fischer carbene: Synthesis, NLO, and electrochemical behavior of a novel organometallic push-pull system

    KN Jayaprakash, PC Ray, Matsuoka, I, MM Bhadbhade, VG Puranik, PK Das, H Nishihara, A Sarkar

    ORGANOMETALLICS   18 ( 19 )   3851 - 3858   1999.9

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  • Synthesis, redox behavior and electrodeposition of biferrocene-modified gold clusters

    T Horikoshi, M Itoh, M Kurihara, K Kubo, H Nishihara

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   473 ( 1-2 )   113 - 116   1999.9

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  • Synthesis and physical properties of azo-ferrocene oligomers and polymers

    M Kurihara, M Kurosawa, T Matsuda, H Nishihara

    SYNTHETIC METALS   102 ( 1-3 )   1517 - 1518   1999.6

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  • Intervalence-transfer bands for mixed-valence oligo(1,1 '-dihexytferrocenylene)s

    H Nishihara, T Horikoshi

    SYNTHETIC METALS   102 ( 1-3 )   1523 - 1523   1999.6

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  • Synthesis and redox properties of poly(cobaltacyclopentadienylene thienylene)

    Matsuoka, I, H Yoshikawa, M Kurihars, H Nishihara

    SYNTHETIC METALS   102 ( 1-3 )   1519 - 1520   1999.6

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  • Near-IR photoconductivity of poly(1,1 '-dihexylferrocenylene)-TCNE CT complex

    H Nishihara, M Kurashina, K Aramaki, K Kubo

    SYNTHETIC METALS   101 ( 1-3 )   457 - 458   1999.5

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  • Synthesis, structure, and redox properties of [{(η5-C5H5)Co(S2C 6H4)}2Mo(CO)2], A novel metalladithiolene cluster

    Masayuki Nihei, Takuya Nankawa, Masato Kurihara, Hiroshi Nishihara

    Angewandte Chemie - International Edition   38 ( 8 )   1098 - 1100   1999.4

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  • Dependence of intervalence-transfer bands for mixed-valence oligo(1,1 '-dihexylferrocenylene)s on the oxidation number and the number of ferrocene units from two to six

    T Horikoshi, K Kubo, H Nishihara

    JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS   1999 ( 19 )   3355 - 3360   1999

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  • IR sensing of the electronic structure in the mixed-valence states of iron carbonyl-attached biferrocene and terferrocene

    T Hirao, K Aramaki, H Nishihara

    BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   71 ( 8 )   1817 - 1823   1998.8

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  • Synthesis of pi-conjugated cobaltadithiolene cyclotrimers and significant effects of electrolyte cation and solvent on their electrochemical, optical and magnetic properties

    H Nishihara, M Okuno, N Akimoto, N Kogawa, K Aramaki

    JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS   ( 16 )   2651 - 2656   1998.8

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  • Regioselective synthesis and electrochemical properties of pi-conjugated cobaltacyclopentadiene oligomer and polymer complexes

    Matsuoka, I, K Aramaki, H Nishihara

    JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS   ( 1 )   147 - 151   1998.1

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  • Simulation of change in conproportionation constants of the windmill complex [Cp3Co3(S6C6)](n-) in the mixed-valence states (n=1,2) by addition of crown ethers to solutions of alkaline metal ions

    M Okuno, K Aramaki, H Nishihara

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   438 ( 1-2 )   79 - 83   1997.11

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  • Redox properties of hepta(1,1'-dihexylferrocenylene)

    H Nishihara, T Hirao, K Aramaki, K Aoki

    SYNTHETIC METALS   84 ( 1-3 )   935 - 936   1997.1

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  • Organic Electronic Conductors

    NISHIHARA Hiroshi

    J. Synth. Org. Chem. Jpn.   55 ( 5 )   410 - 416   1997

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    Language:Japanese   Publisher:The Society of Synthetic Organic Chemistry, Japan  

    The history of organic electronic conductors for half century is shortly reviewed and some recent topics on the synthesis of conducting polymers are presented. Organic conductors can be roughly divided into two categories, crystalline and polymeric materials, of which chemistry and physics have advanced markedly and a variety of examples have appeared. The crystalline materials involve superconducting low-dimensional charge-transfer salts and M3C60 (M is an alkali metal), and the polymeric conductors are mostly made of linearly π-conjugated organic polymers. One of the recent topics given is synthesis of poly (phenylene vinylene) that is one of the most fascinating materials of its high EL ability. Other topics described are synthesis of new class of conducting polymers, π-conjugated donor-acceptor copolymers and π-conjugated polymers involving transition metal complexes. The history clearly indicates that the role of synthetic chemists is still important for finding a breakthrough to open a new era of organic conducting materials.

    DOI: 10.5059/yukigoseikyokaishi.55.410

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    Other Link: https://jlc.jst.go.jp/DN/JALC/00046353375?from=CiNii

  • Electrolyte effects on mixed valence state stability of an electropolymerized bis(fulvalene)diiron film

    H Nishihara, T Nakagawa, K Aramaki

    ELECTROANALYSIS   8 ( 8-9 )   831 - 835   1996.8

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  • Synthesis, electrochemistry and photoconductivity of oligo- and poly-(1,1'-dihexylferrocenylenes)

    T Hirao, M Kurashina, K Aramaki, H Nishihara

    JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS   ( 14 )   2929 - 2933   1996.7

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  • Synthesis of poly(arylene cobaltacyclopentadienylene)s, a new class of organometallic pi-conjugated polymers, by metallacycling polymerization and their physical properties

    T Shimura, A Ohkubo, N Matsuda, Matsuoka, I, K Aramaki, H Nishihara

    CHEMISTRY OF MATERIALS   8 ( 6 )   1307 - 1315   1996.6

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  • Electrochemical synthesis and redox properties of a polyruthenocene electrode film

    T Shimura, K Aramaki, H Nishihara

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   403 ( 1-2 )   219 - 223   1996.2

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  • Synthesis of poly(arylene cobaltacyclopentadienylene)s and their oxidative doping behaviors

    Matsuoka, I, K Aramaki, H Nishihara

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   285   199 - 204   1996

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  • Interaction over Three Redox Centers at Conjugated Oligomeric Ferrocenes withN(=2-6)Nuclei

    K. Aoki, J. Chen, H. Nishihara, T. Hirao

    J. Electroanal. Chem.   416 ( 1/2 )   151 - 155   1996

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  • SYNTHESIS, CHARACTERIZATION AND ELECTROCHEMICAL PROPERTIES OF AN IRON CYCLOPENTADIENYL COMPLEX OF POLY(N-HEXYLPHENYLENE)

    H FUNAKI, K ARAMAKI, H NISHIHARA

    SYNTHETIC METALS   74 ( 1 )   59 - 64   1995.9

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  • SYNTHESIS OF A NOVEL PI-CONJUGATED CYCLIC TRINUCLEAR COMPLEX OF COBALT(III) AND INTRAMOLECULAR ELECTRONIC INTERACTIONS IN ITS REDUCED FORMS

    M OKUNO, K ARAMAKI, S NAKAJIMA, T WATANABE, H NISHIHARA

    CHEMISTRY LETTERS   ( 7 )   585 - 586   1995.7

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  • SYNTHESIS, CHARACTERIZATION AND PHYSICAL-PROPERTIES OF TRICARBONYLMANGANESE AND PENTAMETHYLCYCLOPENTADIENYLCOBALT COMPLEXES OF POLY(9-HEXYLFLUORENE)

    J MATSUDA, K ARAMAKI, H NISHIHARA

    JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS   91 ( 10 )   1477 - 1482   1995.5

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Industrial property rights

  • 二次元配位高分子の製造方法、二次元配位高分子、及び、二次元配位高分子形成用溶液

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    Application no:PCT/JP2024/032755  Date applied:2024.9

    Announcement no:WO2025-058039  Date announced:2025.3

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  • 配位高分子膜、配位高分子膜の製造方法、水素発生用電極及び水素発生装置

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    Application no:特願2022-195136  Date applied:2022.12

    Announcement no:特開2023-084127  Date announced:2023.6

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  • 金属錯体ナノシート及びその製造方法

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    Application no:特願2022-066738  Date applied:2022.4

    Announcement no:特開2023-157074  Date announced:2023.10

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  • 酸素発生用電極及び酸素発生装置

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    Application no:特願2022-047241  Date applied:2022.3

    Announcement no:特開2023-141102  Date announced:2023.10

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  • 配位高分子膜及び配位高分子膜の製造方法

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    Application no:特願2021-188145  Date applied:2021.11

    Announcement no:特開2023-074937  Date announced:2023.5

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  • シート及びシートの製造方法

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    Application no:特願2021-147216  Date applied:2021.9

    Announcement no:特開2023-039866  Date announced:2023.3

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  • 紫外線吸収膜及び紫外線電気変換素子

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    Application no:特願2021-010496  Date applied:2021.1

    Announcement no:特開2022-114267  Date announced:2022.8

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Awards

  • Angewandte Chemie Cover Picture

    2024.2  

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  • 加藤記念賞

    2022.11  

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    Country:Japan

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  • Doctorate Honoris Causa

    2011.12   Université Bordeaux 1  

    NISHIHARA Hiroshi

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  • 日本化学会学術賞

    2003  

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    Country:Japan

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  • 若い世代の特別講演賞

    1992   日本化学会  

    西原 寛

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Research Projects

  • Creation of heterometal coordination nanosheets and development of their functions

    Grant number:24H00468  2024.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Grant amount:\47060000 ( Direct Cost: \36200000 、 Indirect Cost:\10860000 )

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  • Creation of two-dimensional conjugated polymer, coordination nanosheet, and manifestation of higher-order functions using high quality and hetero-structured nanosheets

    Grant number:19H05460  2019.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Specially Promoted Research

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    Grant amount:\544310000 ( Direct Cost: \418700000 、 Indirect Cost:\125610000 )

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  • Unveiling intercalation mechanism of coordination frameworks for energy storage technologies

    Grant number:18F18329  2018.11 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Grant amount:\1100000 ( Direct Cost: \1100000 )

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  • 強電子相関系配位ナノシートの創製

    Grant number:16H00957  2016.4 - 2018.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    西原 寛

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    Grant amount:\3510000 ( Direct Cost: \2700000 、 Indirect Cost:\810000 )

    本研究では、申請者がこれまでに開発してきたメタラジチオレン構造からなるπ共役配位ナノシート(CONASH)のように、錯体ユニット間に強い電子・磁気相互作用を有する「強電子相関系CONASH」の新物質群を開拓し、それらの二次元結晶の大面積化を行う。本研究は新しい化学構造の強電子相関系配位ナノシート(CONASH)の合成、構造解析とキャラクタリゼーション、物性解析の各段階からなる。
    本年度はヘキサアミノベンゼンとニッケルからなる新しい強電子相関系ナノシートNiDIを、空気酸化法と電解酸化法の2種類の手法により合成した。空気酸化法では結晶性を有するナノシートを得ることができた。また電解酸化法では電解時間により基板上のナノシートの量を制御できることを見出した。NiDIは可逆な酸化還元特性と電気伝導性を示し、電池やキャパシタへの展開が期待できる。
    また、トリアミノベンゼントリチオールとニッケルイオンとの反応により、ビス(アミノチオラト)ニッケル錯体骨格を構成単位とする強電子相関系ナノシートNiATを合成した。界面合成法の合成条件を工夫することで単層のNiATを得ることができた。電子線回折およびX線回折実験からNiATが二次元カゴメ構造を有していることを明らかにした。NiATが電気化学的水素発生反応の効果的な触媒として働き、高い耐酸性を示すことを見出した。NiATは化学的な2H+-2e-反応によりビス(イミノチオラト)ニッケル錯体骨格をユニットとするナノシートNiITに可逆的に変換できることを明らかにした。この変換により材料の電気伝導度が1万倍程度変化することを見出した。この大きな伝導度の違いはNiATとNiITのバンド構造の違いに起因する。
    以上のように、これまでにないあらたな機能を有する新しい強電子相関系ナノシートを開発することができた。

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  • Synthesis of high-quality pi-coordination nanosheet using gaseous interface

    Grant number:15K13654  2015.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Nishihara Hiroshi, Sakamoto Ryota, Kusamoto Tetsuro, Nakazato Kazuo

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    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    In a ultrahigh vacuum chamber, hexakis(benzylthio)benzene and nickel(0) were co-deposited on a graphite surface and observed its structure using STM. The co-deposition formed a three-dimensional clusters, and sheet-like products were not observed. In the next experiment, Cu(111) surface, which is supposed to interact more strongly with molecules, was employed for the deposition of hexakis(benzylthio)benzene. Several ordered structures were observed on a whole surface by STM. The formation of clear large two-dimensional sheet-like structure has not been confirmed yet, but the ordered alignment of ligand-originated molecules and metal atoms was observed in a restricted area.

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  • Synthesis of Functional Nanostructures by Interfacial Coordination Programming and Creation of Chemical Devices

    Grant number:26220801  2014.5 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Nishihara Hiroshi

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    Grant amount:\195130000 ( Direct Cost: \150100000 、 Indirect Cost:\45030000 )

    New functional nanostructures have been studied based on coordination programming. We have achieved 1) fabrication of one-dimensional complex molecular wires consisting of redox conduction and/or photoconduction, 2) development of photo-functional devices using hybrid systems of biocomponents PSI, PSII and artificial molecules, 3) synthesis and characterization of two-dimensional coordination nanosheets and their chemical and physical properties and application to photoelectric conversion device, electrochromic device, electrochemical catalyst, secondary battery cathode material, and 4) molecular systems that exhibit optical, electronic and magnetic functions based on new concepts.

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  • 金属錯体πナノシートの界面創製と物性

    Grant number:26110505  2014.4 - 2016.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    西原 寛

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    Grant amount:\5720000 ( Direct Cost: \4400000 、 Indirect Cost:\1320000 )

    金属錯体は金属イオンや配位子の選択・設計により多様な結合様式や幾何構造、化学的ならびに物理的機能を示す。金属錯体をユニットとして連結した高次構造体は、ユニット単体とは異なる新しい物性・機能を発現することから興味深い。申請者は二相界面錯形成反応を利用したニッケラジチオレン(NiDT)ナノシート(2013年報告の初めての機能性配位ナノシート(CONASH))の高質化と物性解明を進めるとともに多種の新規CONASHの合成および物性・化学特性・機能解明を行った。
    強電子相関系CONASH については、NiDTナノシートがレドックス活性で錯体ユニットNiDTが0価と-1価の間の酸化状態を可逆的に制御できることを見出し、NiDT0では160 S cm-1の高導電性を示し、光電子分光やバンド構造の理論計算により金属的であることを明らかにした。また関連物質として、二次元トポロジカル絶縁性に重要なスピン-軌道相互作用を大きくするために重原子導入の研究を行い、改良した二相界面錯形成法を用いるパラジウムジチオレン(PdDT)ナノシートの合成と物性評価および白金(PdDT)ナノシートの合成に成功した。他の機能性CONASHに関しては、ビス(テルピリジン)錯体をユニットとするM(TPY) ナノシートの創製を行った。液液界面錯形成法で大面積の均一な多層フィルムが得られ、Fe(TPY)ナノシートはFeIIの紫色とFeIIIの薄黄色、Co(TPY) ナノシートはCoIIの薄黄色とCoIの青色の変化をする。これらを高分子固体電解質と組合わせて全固体型デュアルエレクトロクロミックデバイスを作製した。また高い光機能性をもつビス(ジピリナト)亜鉛ZnDP1の結晶性CONASHを合成した。このCONASHはSnO2基板上で光電変換特性を示した。さらにポルフィリンをコアとする四方向ジピリン配位子を用いて碁盤型のZnDP2ナノシートを合成した。このナノシートはZnDP1に比べて広い光吸収波長域と高い光電変換量子収率を示した。

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  • 界面配位プログラミングによる分子ネットワークの創製とその機能

    Grant number:26248017  2014.4 - 2015.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    西原 寛, 山野井 慶徳, 草本 哲郎

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    Grant amount:\17550000 ( Direct Cost: \13500000 、 Indirect Cost:\4050000 )

    界面配位プログラミング法を用いて、π共役レドックス錯体の新規分子ネットワークを創製するとともに、それらのユニークな特性を解明する研究を行った。対象物質群の一つは、界面に縦方向に分子ユニットを連結して組み上げる錯体分子ワイヤであり、従来の逐次的結合法に加えて、連続伸張法を開拓して、高速で大規模なレドックス活性を発現させることを目的とした。実際に、ビス(アミノフェニルテルピリジン)金属(金属 = Fe, Ru)の電解酸化重合法により、7000量体にも及ぶ一次元レドックスワイヤを作製し、高速、可逆でな電子移動をお越し、繰り返し特製に優れた新規材料の合成に成功した。さららに異なる金属錯体のヘテロ接合によるダイオード特性の発現にも成功した。
    さらに、レドックス電位の変化と連動した分ローター機能を持つ、ピリジルピリミジン錯体のチオール誘導体の金基板上への固定化とその室温でのSTM測定による分子ローターの挙動観察に成功した。もう一つの対象物質群は界面に横方向に分子ユニットを連結して組み上げる金属錯体ナノシートであり、二相界面合成法を用いて多層および単層の導電性及びレドックス活性な錯体πナノシートを作製し、高速エレクトロクロミック特性、トポロジカル絶縁性、磁気配列能などの特異物性・機能の発現を目指した。具体的にベンゼンテトラチオールを配位子としてを用いた一次元金属錯体、ベンゼンヘキサチオールを配位子としてを用いた二次元金属錯体の液液界面、気液界面によるナノシートの合成に成功し、後者については、レドックス制御により、金属的な性電子的質を示すことを明らかにした。

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  • Creation of methalladithiolene pi-nanosheet

    Grant number:25620037  2013.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Nishihara Hiroshi, SAKAMOTO Ryota

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    In this research project, we conducted the establishment of metal complex nanosheets (thin films with the thickness of single-atom level to nano-meter order) and the evaluation of their physical properties. We developed the fabrication process to form dense and multilayered nanosheet on a substrate, and the new nanosheet synthesis method using the interface between a substrate surface and vapors of a metal ion and a ligand. The conductivity moderation of nanosheet was achieved by the electronic state control. In addition, we created functional nanosheets which show the electrochromic behaviors or the photocurrent generation. These results exhibited that metal complex nanosheets can be new attractive nano materials.

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  • フォトシステム/分子ワイヤ結合型光エネルギー変換系の創製

    Grant number:24655116  2012.4 - 2013.3

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    西原 寛

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    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

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  • Fabrication of Photosystem II-Molecular Wire Hybrid-Type Light Energy Conversion System

    Grant number:23245029  2011.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    NISHIHARA Hiroshi, MIYACHI Mariko

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    Grant amount:\26390000 ( Direct Cost: \20300000 、 Indirect Cost:\6090000 )

    Molecular wire-Pt nanoparticle(PtNP) unit for PSI has been newly developed. This molecular wire can be exchanged with vitamin K1 in the quinone pocket of photosystem I (PSI). Similarly, molecular wire-PtNP unit for PSII was newly developed. PSI and PSII were reconstituted with these units. Photoinduced hydrogen evolution occurred with PSI-molecular wire-PtNP using sacrificial reagent. The molecular wire -PtNP unit was successfully introduced to PSII, however, Mn cluster was removed from PSII in the reconstitution process. In the achievement of water-splitting reaction with PSII-molecular wire-PtNP, reconstitution of the Mn cluster will be necessary.

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  • Synthesis of three-dimensional networks of metal nanoparticles using bridging ligands and their functions

    Grant number:22655041  2010 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    NISHIHARA Hiroshi

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    Grant amount:\3450000 ( Direct Cost: \3000000 、 Indirect Cost:\450000 )

    New multidirectional bridging ligands with 2-4 terpyridine groups were synthesized and their utilization for the formation of nanopores by construction of three-dimensional networks with combining isocyanide-protected palladium nanoparticles. The final goal of this study is to increase the capacity of hydrogen storage by the contribution of both interparticle nanopores and intraparticle lattice vacancies. The validity of this concept has been supported by the structural analysis of newly synthesized three-dimensional networks of Pd nanoparticles and by the measurement of their N_2 and H_2 absorption abilities.

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  • Coordination Programming - Science of Molecular Superstructures for Chemical Devices

    Grant number:2107  2009.7 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    NISHIHARA Hiroshi

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  • Chemical Devices Using Intelligent Molecular Systems and Surface Technology

    Grant number:21108002  2009.7 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    NISHIHARA Hiroshi, NAKAZATO Kazuro, YAMANOI Yoshinori, SAKAMOTO Ryota, KUSAMOTO Tetsuro, UNO Shigeyasu

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    Grant amount:\144820000 ( Direct Cost: \111400000 、 Indirect Cost:\33420000 )

    The purpose of this study is to achieve the construction of intelligent molecular networks using coordination programming, to analyze their physical and chemical characteristics, and to develop chemical devices based on their unique functions. We have revealed that the whole electron transfer behavior of a molecular network can be quantitatively estimated by adding the contribution of each molecular unit comprising the network. New methods to connect vinyl and aryl groups to Si surface were developed and used for fabrication of a photo-switch of molecular electrical conductivity. We also created an interfacial method to synthesize metal complex nanosheets, and succeeded in preparation of a redox active and electronically conductive single-layer nickelladitiolene pi-nanosheet. A highly sensitive photosensor based on a combination of bio-component, PSI with molecular wire, AuNP and electrode was constructed. Various kinds of new stimuli-responsive molecules were also synthesized.

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  • Coordination Programming: Science of Molecular Superstructures towards Chemical Devices

    Grant number:21108001  2009.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    NISHIHARA Hiroshi, YAMAMOTO Kimihisa

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    (1) We held meetings for discussing the progress and perspectives of the studies as well as for communicating with the researchers outside of our research area. (2) We organized an international conference, ISCP2014. (3) Feature issues on coordination programming were published in three kinds of international scientific journals. (4) We encouraged young researchers to organize symposia and conferences and to construct an international reseach network. (5) The research results and hot topics were distributed widely via webpage and news letters that were published twice a month.

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  • 多機能性フォトクロミック錯体の創製

    Grant number:21021005  2009

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    当研究室ではアゾ置換ビピリジン銅錯体において、光異性化反応と配位子交換反応を連動させ、光電変換系の構築に成功しており、本研究では、この銅錯体に酸塩基に応答する水酸基を導入することで、光異性化をスイッチし、光電変換をオンオフできることを目指した。水酸基を導入したアゾ置換ビピリジン銅錯体[Cu(oAB-OH)_2]BF_4を11段階の反応を経て合成した。[Cu(oAB-OH)_2]BF_4はテトラヒドロフラン中、372nmにπ-π*吸収帯が、可視光領域にn-π*吸収帯およびMLCT吸収帯を示した。これに365nmの紫外光照射を行うと、π-π*吸収帯の減少と、n-π*吸収帯の増加がみられ、トランス体からシス体への異性イヒが進行した。これに対して436nmの青色光照射を行うと、逆向きに異性化が進行した。ここに塩基として0.2当量のDBU(1,8-ジアザビシクロ[5,4,0]ウンデカ-7-エン)を添加したところ、光を照射しても異性化が観測されなくなった。これはDBUと水酸基の間の水素結合の形成により、シス体からトランス体への熱による異性化が加速されたためと考えられる。さらに、TFA(トリフルオロ酢酸)を添加したところ、再び光異性化が観測され、酸塩基により光異性化を可逆にスイッチできることが分かった。
    一方、Ru-DMSO錯体は可視光によって励起され、基底状態ではS配位をとるDMSOがO配位に変化する。この異性化は、電子移動によるルテニウムの酸化数の変化によっても引き起こされる。しかし、結合異性化に並行して配位子が解離することが問題点である。そこで今回、キレート配位子にスルホキシド部位を組み込むことで、錯体の光に対する安定性の向上を目指し、新たな錯体の合成と物性測定を行った。その結果、スルホキシド配位子のかさ高さが異性化による構造変化に影響している事が示唆された。また、スルホキシド配位子の可変性も電気化学応答において、異性化に影響を与え得ると考えられる結果が得られた。

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  • Creation of metal complexes and their assemblies causing multi-mode reversible conversion of structures and physical properties

    Grant number:20245013  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    NISHIHARA Hiroshi, YAMANOI Yoshinori, KUME Shoko, SAKAMOTO Ryota

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    Grant amount:\48100000 ( Direct Cost: \37000000 、 Indirect Cost:\11100000 )

    This study aims at creation of metal complexes and their assemblies which undergo reversible and multiple mode conversion of structures and physical properties. In this study, it is expected to induce multiple stabilities not only by analyzing the physical properties of the molecules but also by operating the bonding nature of the molecules, and to find unique chemical bond formation from the molecules with unprecedented electronic structures. Redox-conjugated photochromic molecules, pyrylinium-containing fused ring compounds with strong intramolecular donor-acceptor interaction, metalladitholenes with photo-, magneto-, and electro-functions and their-extended systems were developed.

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  • ナノ粒子触媒による14族有機金属化合物の高効率ワンポット合成の開発

    Grant number:08F08354  2008 - 2010

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    西原 寛, ALDES Lesbani

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    Grant amount:\2000000 ( Direct Cost: \2000000 )

    14族有機金属化合物(Si, Ge, Sn)は合成中間体や医薬品・機能性材料のビルディングブロックとして有用な化合物群であり、これらは通常、有機リチウム試剤やGrignard試剤に代表される有機金属反応剤により合成される。本研究ではヒドロシランとハロゲン化アリール間のカップリング反応の開発を行った。具体的には、1級~3級の14族化合物(REH_3, R_2EH_2, R_3EH:E=Si, Ge)に触媒と塩基の存在下、ヨウ化アリールを反応させ、ワンポットで対応するアリール化体を合成することができた。触媒としてはナノ金属触媒(擬均一系触媒)、錯体触媒(均一系触媒)、固定化触媒(不均一系触媒)などを詳細に調査し、パラジウム錯体Pd(P(P(t-Bu)_3)_2)を用いた時に最も良い結果を与えた。使用する溶媒や塩基、そして反応温度にも本反応の反応収率は大きく影響し、溶媒はテトラヒドロフランまたはジメトキシエタンなどのエーテル系溶媒、塩基はジイソプロピルエチルアミンなどの有機アミンを用い、室温(25℃付近)で反応させた時に最も良い結果を与え、高収率で様々なアリール化体を合成できた。この手法を用いてこれまで合成が困難であった、トリス(トリメチルシリル)シランのアリール化も行い、効率の良い青色発光化合物の合成にも成功した。また農薬として多用されるフルシラゾールの短工程合成にも成功した。本反応によって合成された新規化合物は100種類以上にのぼり、光学材料や生理活性を示す医薬品の合成に有用な手法である事を実証した。

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  • 導電性高分子ポリジメチルアミノピロールの合成と特異物性・機能解明

    Grant number:20655028  2008 - 2009

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    西原 寛

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    Grant amount:\3300000 ( Direct Cost: \3300000 )

    本研究では導電性高分子でありながら、平坦バンド強磁性体の候補であり、特異な物性を示すポリ[1-(N,N-ジメチルアミノ)ピロール]を研究対象とした。その基礎物性の解明を行なうとともに、エレクトロクロミック材料および磁気材料としての応用性を評価、探求した。具体的には、まず、ポリ[1-(N,N-ジメチルアミノ)ピロール]の重合度の高い成分の単離を行い、4量体をn-BuLi/t-BuOK/THFを用いてリチオ化し、NiCl_2(dpppe)を用いて重合することにより、16量体を4%、20量体を3%得た。それらは^1H NMRおよびESI-MSスペクトルにより同定した。
    次に、これまでの研究で、1)4,6,8量体の2電子酸化体はEPR不活性だが、10,12量体の4電子酸化体の固体試料は5KにおいてEPR活性であり、g=2にナローイングを起こしたシグナルを与えるが、g=4付近等の高スピン状態を示すシグナルは現れないこと;2)スピン密度は一オリゴマー分子あたり3程度あり、複数のスピンが「常磁性」的に存在すること;3)溶媒ガラス中の測定では、スピン密度は固体粉末状態より小さく、溶媒に依存し、EPRスペクトルにはg=2のシグナルのみしか現れないこと、を見出してきたので、これらをさらに検証して物性を解明するにはSQUIDを用いる磁性測定を試みた。しかし、酸化状態生成の再現性と固体としての単離等が難しく、まだ結論を出すには至っていない。今後、数回の測定を行い、特異な磁性を解明する計画である。
    エロクトロクロミズムについては、中性状態の無色から酸化状態の青色に大きく色変化を起こすことを明らかにした

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  • フォトクロミック分子と金属錯体の融合による多重機能の開発

    Grant number:20044005  2008

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    フォトクロミック分子と金属錯体を融合した系、「フォトクロミック錯体」では、両分子ユニットの電子的および立体的相互作用による新現象が期待される。新規フォトクロミック錯体の多重機能の発現に関して、下記の研究成果を得た。
    電子ドナーであるフェロセンおよびトリエチルアミン部位2個を結合したジエチニルエテン類を合成し、そのCTバンドの可視光励起による光異性化、並びにドナー部位間の電子相互作用の大きさを光スイッチングできることを明らかにした。またトリエチルアミン系においては、蛍光の光スイッチングも発現した。レドックス核間電子相互作用の大きさを光スイッチングする系として、HOMOレベルが光異性化により大きくシフトするジメチルジヒドロピレン(DHP)にフェロセン部位2個を結合したFc_2BzDHPを合成した。この錯体は、上記の目的を達成する以外に、フェロセン部位のみの酸化によるBzCPD→BzDHPめ新規な間接的閉環反応を起こすことを見出した。アゾベンゼンの可逆なtrans-cis光異性化を利用した磁性変換を目指し、固体・溶液両状態でSCOを示すピリジルベンズイミダゾールにアゾベンゼンに導入した配位子、trans-5azopybim(2)、およびその鉄(II)錯体、[Fe(2)_3](BF_4)_2・3H_2Oを合成した。室温における光異性化に伴う磁化率変化をEvans法にて調べたところ、磁化率は365nmの照射により増加、続く436nmの照射により減少し、繰り返し応答が観測され、可逆的な光誘起磁性変換が可能となることを明らかにした。
    アゾベンゼンを持つジチオラト配位子とアゾベンゼンを持つビピリジン配位子を結合したPt(II)錯体において、光応答波長が紫外-可視光全域まで拡がることならびに、異なる3波長の光で、2個のアゾベンゼン部位のtrans-trans, trans-cis, cis-transの三重安定状態を相互に可逆に変換できることを明らかにした。

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  • 良結晶性ドナーアクセプター共役接合分子を用いる多機能FETの作製

    Grant number:18655021  2006 - 2007

    日本学術振興会  科学研究費助成事業  萌芽研究

    西原 寛, 山野井 慶徳, 久米 晶子

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    Grant amount:\3600000 ( Direct Cost: \3600000 )

    プロトン、温度、ゲスト分子などの外部刺激に応答してその結晶構造や分子構造を可逆的に変換することのでき、かつ極めて容易に結晶化することができるドナー-アクセプター共役接合分子を有機FET(電界効果トランジスタ)のゲート材料として用い、その新規な系のFET特性を明らかにする。さらに、この分子の外部刺激応答性を利用した外場制御型分子FETとしての性能を評価する。分子材料としてまず、1,4-diferrocenylethynylanthraquinone(1,4-Fc_2Aq)に着目した。そのモデル化合物である1-フェロセニルアントラキノンがプロトン付加により温度により、原子価互変異性を示すフェロセン-ピリリウム共役分子が生成することを見出し、メスバウアースペクトルによりその特性を明らかにした。1,4-Fc_2Aqは結晶状態においてナノ孔構造を持つことを明らかにしているので、平滑性の高いSi-SiO_2基板を用い、真空蒸着法により1,4-Fc_2Aqの基板上への薄膜作製を試みたところ、アモルファス状態の均一薄膜ができた。しかし、THF雰囲気下に放置したところ、ゲスト吸着が進行し、径10μm程度のドメイン構造をもつ不均一膜になることが分かった。次に、プロトン付加により電荷をもたないドナーアクセプター共役接合分子をつくるような分子系をつくり、そのプロトン付加体の蒸着膜をFET(電界効果トランジスタ)のゲート材料として用いることを企画した。分子として、アントラキノンとフェニルジチオレートをエチニレン架橋した新規配位子を合成した。祖にニッケル錯体の合成に成功し、プロトン付加したところ、予想通り、強いドナーアクセプター相互作用をもつ新規分子であることが分かった。現在、この分子の構造、機能評価と熱分析を行っており、今後FETに蒸着し、特性を評価する予定である。

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  • 光機能性金属錯体の開拓に関する企画調査

    Grant number:18635001  2006

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    加藤 昌子, 石谷 治, 喜多村 昇, 西原 寛, 山内 清語, 民秋 均

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    Grant amount:\3400000 ( Direct Cost: \3400000 )

    研究主題である「光機能性金属錯体の開拓」について,下記のとおり2回の企画調査研究連絡会議を行った。第1回は,平成18年9月12日,仙台国際センター(仙台市)にてメンバーが集まり,光機能性金属錯体に関する最新の研究動向について意見を交換した。第2回は,平成19年2月12日,北海道大学(札幌市)にて,ワークショップ「光機能性金属錯体のフロンティア」を開催し,本研究課題に関する活動状況や最新の研究成果についての報告と討論を行った。また,続いて行った企画調査会議において,研究成果の総括と今後の展開について議論した。その他,世話人による数回の打ち合わせ会議を行った。本研究に基づいて日本化学会の特別企画を提案し,次のとおり採択された。平成19年3月28日,関西大学千里山キャンパスにて,日本化学会第87春季年会特別企画「光機能性金属錯体のフロンティア-機能の創成と評価」を開催予定である。また,特定領域研究(新規領域)に,本研究課題の研究分担者である東北大学多元物質科学研究所の山内清語を代表として,「ダイナミックスピン:金属錯体を含む複合系の動的機能の創製」を提案,申請を行った。また,研究分担者の東京工業大学石谷治をオーガナイザーとして,配位化合物の光物理と光化学の国際会議(International Symposium on Photochemistry and Photophysics of Coordination Compounds, ISPPCC)の積極的な誘致活動も行っており,今後,国際的にも本研究分野の発展に努力していく。

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  • Synthesis of novel metal complexes exhibiting multi-stabilities and creation of molecular systems exhibiting multi-functionalities

    Grant number:17205007  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    NISHIHARA Hiroshi, YONEZAWA Tetsu, YAMANOI Yoshinori, KUME Shoko

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    Grant amount:\42770000 ( Direct Cost: \32900000 、 Indirect Cost:\9870000 )

    The purpose of this study is to create intelligent molecular systems where the chemical and physical structures and the optical, magnetic and electronic properties are changed reversibly and then to produce "molecular functional devices" by combining the molecular systems with electrode surface. As for □-conjugated redox complex oligomers and polymers, we have succeeded in bottom-up synthesis of one- and three-dimensional oligomer complex molecular wires by step-wise coordination reactions on the surface, and have found the phenomena of redox-conduction along the molecular wires for the first time. Photo-electron conducting molecular wires were also prepared using such molecular wires with terminal porphyrin moieties. As for photochromic complexes, we synthesized ferrocenylspiropyran with an ability to control the memory depth by changing the redox state, bis(ferrocenylethynyl)ethane and its triarylamine derivatives, which cause alteration of electronic communication between terminal redox moieties by photoisomerization, and self-assembled monolayers of ferrocenylazobenzene, which undergoes reversible isomerization of azobenzene moieties with a single green light source by combining with the redox reaction of ferrocene moiety. As for donor-acceptor conjugated molecules, we have found that 1-ferrocenylethynylanthraquinone reacts with proton to cause cyclization reaction to give a pyrilium salt, which shows valence tautomerization with temperature change. We have also found that 1,4-bis(ferrocenylethynyl)anthraquinone undergoes reversible single crystal - single crystal structural changes by absorption of guest molecules. As for heterometal cluster complexes, we synthesized several types of new cluster complexes by the reaction of metalladithiolenes with metal carbonyls. They exhibit unique redox and optical properties.

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  • Construction of Electro-functional Space Using Interfacial Bottom-up Synthesis of Coordination Bond Network

    Grant number:16074204  2004 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Priority Areas

    NISHIHARA Hiroshi, YAMANOI Yoshinori, KUME Shoko, YONEZAWA Tetsu

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    Grant amount:\70400000 ( Direct Cost: \70400000 )

    In this project, we aim at the construction of electro-functional interfacial space by assembling pi-conjugated and/or redox active metal complex molecular chains in one, two, or three dimensions. Bottom-up approach using successive coordination bond formation is utilized in order to create the space in which potential distribution can be controlled by external stimuli such as electrons and photons.
    Films of linear and branched oligomer wires of Fe (tpy)2 (tpy = 2,2' :6',2" -terpyridine) were constructed on a gold electrode surface by the interfacial stepwise coordination method employing a surface-anchoring ligand, (tpy-C6H4N=NC6H4-S) 2 (1), two bridging ligands, 1,4-C6H4(tpy)2 (3) and 1,3,5-C6H3(C・C-tpy)3 (4), and metal ions. The quantitative complexation of the ligands and FeII ions was monitored by electrochemical measurements in linear oligomers of 3 up to eight complexation cycles and in branched oligomers of 4 up to four cycles. STM observation of branched oligomers at low surface coverage showed an even distribution of nanodots having uniform size and shape, suggesting the quantitative formation of dendritic structures.
    The electron transport mechanism and kinetics for the redox reaction of the films of linear and branched oligomer wires were analyzed by potential step chronoamperometry (PSCA). The unique i-t behavior, obtained similarly in all conditions indicates that electron conduction occurs not by diffusional motion but by successive electron hopping between neighboring redox sites within a molecular wire. This is the first observation of redox conduction in a single molecular wire in redox polymer films.
    Other studies such as fabrication of Co-Ru wires and anthraquinone-bridged metal complex molecular wires were also reported.
    We also constructed a ferrocenylabozenezene SAM which can undergo reversible isomerization with a single green light source and a redox reaction.

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  • 光機能レドックス錯体界面配列体による光エネルギー変換

    Grant number:15033215  2003 - 2004

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛

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    Grant amount:\5000000 ( Direct Cost: \5000000 )

    本研究では、アゾ基を有する光機能分子ユニットとレドックス錯体とを共役結合した新しい物質群を創製し、それらを界面に配列固定することによって、光エネルギーを化学・電気エネルギーに変換する非従来型システムを構築することを目的とする。
    1)フェロセニルスピロピランのレドックス制御光異性化
    開環形と閉環形との間での光異性化を起こすことが知られており,両者の双極子モーメントが大きく異なるスピロピランにドナー・アクセプター性を酸化還元により制御できるフェロセンを結合したフェロセニルスピロピラン錯体Fc-SPを新規に合成し,その光応答性と酸化還元挙動について検討をし,レドックスを用いた光異性化挙動の制御を行った.Fc-SPはジクロロメタン中で345nmに吸収極大をもち,紫外光照射により開環形Fc-MCへと異性化したが、Fc-MCの生成率は低かった。一方、フェロセン部位を酸化したあと(Fc^+-SP)に紫外光を照射すると,高収率でFc^+-MCが生成し、すでに報告したアゾベンゼン系錯体と同様に、レドックスによる光異性化制御ができることを示した。
    2)3-フェロセニルアゾベンゼン誘導体の界面配列と光異性化
    緑色光とレドックスによる可逆な異性化を起こす3-フェロセニルアゾベンゼン^<5)>の界面固定とその光異性化・レドックス挙動の解明を行った。最初に作製したアルコキシ誘導体の金上の自己集合単分子膜(4)は、可逆なレドックス特性と紫外光によるトランス-シス異性化を示したが、緑色光による異性化は示さなかった。一方アルキル誘導体のITO上の自己集合単分子膜は可逆なレドックス特性と緑色光による異性化を示した。

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  • Creation of Multifunctional Photochromic Metal Complexes

    Grant number:14204066  2002 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    NISHIHARA Hiroshi, MURATA Masaki, YONEZAWA Tetsu

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    Grant amount:\55510000 ( Direct Cost: \42700000 、 Indirect Cost:\12810000 )

    This project aims at the creation of new photochromic metal complexes, the investigation of their unique multiple functionalities, and the fabrication of novel types of molecular switches and memories by organizing them at the electrode surfaces. Summary of the results obtained is as follows, 1)Azobenzene-bound tris(bipyridine)cobalt complexes and ferrocenylazobenzenes underwent novel reversible trans-cis isomerization of azobenzene moieties using the combination of photoirradiation with a single light source and redox reaction of a metal complex moiety. 2)Photoluminescence properties of azobenzene-bound terpyridine platinum complexes were turned on and off by the reversible trans-cis isomerization of the azobenzene moiety. 3)A mixture of an azobenzene-attached bipyridine ligand, dmpAB, unsubstituted bipyridine, and Cu ions underwent reversible ligand exchange reactions by redox reaction of Cu(II)/Cu(I), and consequently, trans-cis isomerization of azobenzene moieties using the combination of photoirradiation with a single light source was achieved. 4)Azo-conjugated dithiolato and catecolato complexes underwent proton-catalized cis-to-trans isomerization. 5)SAMs of azobenzene-bound metal terpyridine complexes and ferrocenylazobenzene derivatives were prepared and their photochemical reactions investigated. 6)A new "molecular photo-electro transducer", working in a cyclic manner totally powered with light irradiation, has been constructed. The UV/blue controlled repetitive motion of azobenzene moieties in 6,6'-bis(4"-tolylazo)-4,4'-bis(4-tert-butylphenyl)-2,2'-bipyridine causes reciprocal Cu(I) translocation between two coordination environments, resulting in pumping of the redox potential of Cu(I). Therefore, UV/blue light information can be successfully transformed into an electrode potential change and positive/negative current response, which is closely related to natural visual transduction both functionally and mechanically. 7)A new platinum complex with both an azo-bound dithiolato ligand and an azobenzene-bound bipyridine ligand exhibits testability reversibly controllable using different energy lights.

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  • ドナーアクセプター共役多核錯体における原子価互変異性の外場制御

    Grant number:14654121  2002 - 2003

    日本学術振興会  科学研究費助成事業  萌芽研究

    西原 寛, 村田 昌樹

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    Grant amount:\3500000 ( Direct Cost: \3500000 )

    光やプロトンのような外からの刺激に応答して多段階に物性を変化させることのできるクロミック金属錯体分子を集積化することでナノ機能性材料への展開が可能である。これまでドナー(D)-アクセプター(A)系であるフェロセン-キノン共役接合錯体を合成し、プロトン付加によって分子内電子移動が制御可能であることを見出し、分子内電子移動により生じる構造変換やそれに伴う酸化還元電位の変化、原子価互変異性など系の多様な構造、物性変化について明らかにしてきた。本年度は、ドナーを2つ有するD-D-A接合錯体とD-A-D接合錯体を新たに合成し、集積化が及ぼす物性変化について検討を行った。
    1'-エチニルビフェロセンと1-ブロモアントラキノンのクロスカップリング反応によりD-D-A共役錯体、1-BFcAqを新規合成した。1-BFcAqのベンゾニトリル溶液にトリフルオロメタンスルホン酸を段階的に添加した際の紫外可視近赤外吸収分光測定を行った。吸収スペクトルより、510nmのMLCT吸収帯の吸収強度の増加と1030nmのIVCT吸収帯出現が観測され、D-A=1:1型分子と類似した結果を得た。このことは、1-BFcAqのプロトン付加体では、分子内電子移動によってA部位と隣接するフェロセンのCp環がフルベン骨格となっていることを示している。電気化学測定においては、酸添加前はビフェロセンの酸化は混合原子価状態の生成を伴う2段階1電子反応として観測された。この測定系にプロトンの段階的添加を行ったところ、2段目の酸化波がフルベン骨格への構造変換を示す結果を得た。このことは、1-BFcAqを酸化すると末端のフェロセンが先に酸化を受けることを示しており、プロトン応答と酸化還元応答に対し、異なったD部位が応答するという興味深い知見を得た。
    また、エチニルフェロセンと1,4-ジブロモアントラキノンのクロスカップリング反応により合成したD-A-D共役錯体、1,4-Fc_2Aqでは、種々の溶媒(CH_2Cl_2,CHCl_3,THF,ο-C_6H_4Cl_2)から10×10Åのナノ孔を持つ単結晶が得られ、この単結晶では、π-πスタッキングによって、D部位とA部位が交互規則配列構造を持ったカラム構造を持つ配位高分子となっていることを明らかにした。

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  • レドックス共役メタラサイクルの位置選択的合成と電子機能分子への変換

    Grant number:14044021  2002 - 2003

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛

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    Grant amount:\3700000 ( Direct Cost: \3700000 )

    芳香性を有するπ共役メタラサイクルは、π共役導電性高分子のユニットとして注目される。完全に位置選択的なメタラサイクル形成反応の達成は、π共役長を制御する上で重要である。本研究では、完全に位置選択的環形成を達成し、さらに高分子化によって、電子機能分子を合成することを目的とする。ここでは、ルテニウムを含むメタラサイクルに関し、以下の結果を得た。
    新規ルテニウム錯体[(HexCp)RuBr(cod)]と4-ethynylbiphenylとの反応におけるルテナシクロペンタトリエンの生成反応機構について調べた。その結果このメタラサイクルはさらに反応し、アセチレンの環化三量体が生成した。このメタラサイクル形成反応において、各化合物の濃度の時間変化を^1H-NMRスペクトルにより追跡した。各化合物の時間変化を説明するために反応機構を提案した。この反応機構においては、アセチレンが一分子のみ配位した中間体が生成し、これがメタラサイクルと反応し得るとした。この機構でアセチレン過剰の場合にメタラサイクルが減少しなかったことを説明できた。
    次に高分子錯体の合成を行った。[(HexCp)RuBr(cod)]と4,4'-diethynylbiphenylを0℃で反応させることでポリ(ビフェニレンルテナシクロペンタトリエニレン)を合成した。このポリマー錯体の^1H-NMRスペクトルから、ポリマー錯体は単一構造のメタラサイクル環のみで構成された高分子であることが見出された。ポリマー錯体の分子量分布をGPCの測定から推定し、M_n=3400,M_w=5800と得た。UV-vis-NIR吸収スペクトルおよびサイクリックボルタンメトリーの測定から、共役系が拡大していることが示された。モノマー錯体の還元体ESR測定から、不対電子がルテナサイクルに非局在化していることが示唆された。さらにポリマー錯体の還元体のESR測定より、分子内でのルテナサイクルサイト間のスピン間に強磁性的な相互作用があることが明らかとなった。

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  • フォトクロミック錯体界面配列体の構築と多重機能発現

    Grant number:14050032  2002

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛

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    Grant amount:\2700000 ( Direct Cost: \2700000 )

    新しい多重機能をもつフォトクロミック錯体を創製し、それらを界面に配列固定することによって、非従来型の分子スイッチ,分子メモリシステムを構築することを目的とし、新しいアゾ共役金属錯体の開発とそのSAM作製を検討した。
    一定波長照射下でのトランス体/シス体の存在比が金属の価数で可逆的に大きく変化するアゾ共役遷移金属錯体を合成探索し、単一波長光とレドックスで可逆な異性化の実現を検討した。単一紫外光とCo(III)/Co(II)のレドックスの組合せでの可逆な異性化を起こすトリスビピリジンコバルト系においてアゾ基の置換位置の違いによって、異性化率を制御できることがわかった。また、m-フェロセニルアゾベンゼンにおいて単一緑色光とFe(III)/Fe(II)のレドックスの組合せでの可逆な異性化を実現した。
    8-(4-ferrocenylazophenoxy)octanethiol (FAPT) SAMとFAPT/octanethiol混合SAMを作製した。窒素雰囲気下における乾燥SAMの光応答は乾燥MeCN中と同様の変化を示し、緑色光照射(λ_<max>=546nm)によって315nmにピークが出現し、cis体への異性化が起きたと考えられる。FAPT/octanethiol混合SAMはより速い光変化を示した。
    新規ジスルフィド配位子(tpyAB-S)_2、アゾベンゼン架橋テルピリジン配位子(tpyABtpy)を用いることによって、アゾ基を共役スペーサーとした錯体を電極表面上に多層配列させることを目的として、(tpyAB-S)_2修飾金電極をFe(NH_4)_2(SO_4)_2溶液、続いてtpyABtpy-CHCl_3溶液に交互に浸漬させた。このレドックス電流値はこの操作を繰り返すことによって増加し、金単結晶表面上での段階的錯形成が可能であることが示された。

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  • 混合原子価分子物性の光スイッチングと界面分子配列による複合同期化

    Grant number:13022212  2001 - 2002

    日本学術振興会  科学研究費助成事業  特定領域研究

    西原 寛, 栗原 正人

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    Grant amount:\3600000 ( Direct Cost: \3600000 )

    本研究では、アゾ共役錯体を創製し、弱刺激によって系全体が連動した状態・物性変化を発現し、光と電気のような複合刺激によって状態・物性変化を示すシステムを構築することを目的とした。研究の結果、特に、Cu(II)/Cu(I)の可逆なレドックスを示し、Cu(I)では四面体形構造、Cu(II)では平面四角形形構造をとり易いことが知られているビス(ビピリジン)銅錯体の特性とアゾ基の光異性化特性とをシンクロナイズさせた下記の二つの分子系を創製した。
    2,2'-ビピリジンの4位にアゾベンゼンを結合し、6,6'位をメチル基で置換した新規配位子、dmpABを2当量、無置換ビピリジンを2当量、Cuイオンを1当量混合した系の光異性化挙動を検討した。dmpABの銅錯体ではCu(I)の四面体形構造が配位子のメチル基同士のインターロッキング効果で安定化され、Cu(II)の平面四角形構造はメチル基同士の立体反発で不安定化される。したがって、系内にビピリジンを共存させると、Cu(I)では[Cu(dmpAB)_2]^+が主であり、Cu(II)では[Cu(bpy)_2]^<2+>が主となると予想される。実際に、電気化学測定からこの配位子交換が起こることが示された。紫外光照射による光異性化実験では、ビピリジンを共存させない場合に比べて、Cu(II)状態でのシス体の生成が促進されることが示された。その結果、Cu(II)/Cu(I)のレドックス変化と単一紫外光源を用いた可逆的トランス-シス異性化が実現した。
    2,2'-ビピリジンの6,6'位にアゾベンゼンを結合した新規配位子、oABとビピリジンおよび銅イオン(Cu(II)およびCu(I))を共存させた系の光異性化挙動を検討した。oABはトランス体ではインターロッキング効果でCo(I)に強く配位するが、シス体では配位力が弱まる。また、[Cu(oAB)_2]^<3+/2+>のレドックス電位は[Cu(bpy)_2]^<3+/2+>の電位より0.6V貴側にある。その結果、上記混合系において、紫外光照射によるトランス-シス異性化と青色光照射によるシス-トランス異性化で、oAB錯体とbpy錯体の比率が変わり、系の電位が可逆的に変化することが見出された。

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  • アゾ架橋マルチレドックス錯体の合成と核間電子移動の光スイッチング

    Grant number:00F00122  2001

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    西原 寛, KORUPOJU S. R.

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    Grant amount:\1200000 ( Direct Cost: \1200000 )

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  • レドックス共役メタラサイクルの位置選択的合成と電子機能分子への変換

    Grant number:13029027  2001

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    西原 寛

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    芳香性を有するπ共役メタラサイクルは、π共役導電性高分子などの電子機能物質のユニットとして注目される。完全に位置選択的なメタラサイクル形成反応の達成は、π共役長を制御する上で重要である。本研究では、ドナーおよびアクセプター分子を付加したアセチレン類からメタラサイクルを生成する反応を利用して、完全に位置選択的環形成を達成し、さらに高分子化によって、電子機能分子を合成することを目的とする。ここでは、コバルトとルテニウムを含むメタラサイクルに関し、以下の結果を得た。
    1)コバルタシクロペンタジエンの位置選択的合成 種々のアセチレンの組合せを用いて、コバルタシクロペンタジエン環形成反応における位置選択性の立体効果と双極子効果との相乗作用による制御を検討した。その結果、アセチレン結合軸に対して垂直方向にかさ高い9-anthracenyl基を用いると、3,4-Ar_2のみを選択的に得ることができた。さらに、phenyl基よりも3次元的にかさ高い(2,3,5,6-tetramethyl)-1-phenyl基を用ることによって2,4-Ar_2のみが得られた。
    2)ルテナシクロペンタトリエン形成反応機構の解明と高分子錯体合成 CpRuBr(cod)と2個のアセチレンによるルテナサイクル形成反応機構を調べたところ、2,5位に置換基がくる位置選択的な反応であること、生成したルテナシクロペンタトリエンと過剰なアセチレンとの2次反応が起ることがわかった。アセチレンが過剰にならない条件下では、ルテナサイクルが選択的に生成することから、溶解性を上げるためのヘキシルシクロペンタジエニル基を含む錯体とジアセチレンとの反応により、単一のルテナサイクル骨格をもつ高分子の合成に成功した。

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  • レドックス活性な金クラスター薄膜の合成と物性の電場制御

    Grant number:12874085  2000 - 2001

    日本学術振興会  科学研究費助成事業  萌芽的研究

    西原 寛, 久保 謙哉, 水谷 淳

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    本研究は、次世代のナノ素材として期待されている金属超微粒子に、レドックス分子を修飾することにより発現する物性の解明と、その次元構造制御による新規な機能材料への応用を目的とした研究を行い、以下の成果を得た。
    1)ビフェロセンチオール修飾パラジウムクラスターの電気化学的界面凝集オクタンチオール修飾パラジウムクラスターにビフェロセンチオール誘導体を反応させることにより、ビフェロセン修飾パラジウムクラスターを合成した。その電位掃引による酸化、再還元サイクルによって、ITO上にパラジウムクラスター薄膜が生成した。この方法を用いてパラジウムクラスターと金クラスターの交互積層膜を生成できることを示した。
    2)ビフェロセンのジチオール誘導体を用いる金ナノ微粒子単層膜形成新規合成したビフェロセンジスルフィド誘導体とビフェロセンジチオール誘導体の自己集合単分子膜(SAM)を作製し、それらの構造,レドックス特性の違いを明らかにするとともに、その上への金ナノ微粒子の修飾による単層膜形成を検討した。ビフェロセンジスルフィド誘導体のSAMはビフェロセンユニットの表面被覆率(Γ_<Bfc>)が低く、分子内の二つのチオレートが金に結合しているが、ジチオール誘導体のSAMはΓ_<Bfc>が高く、分子内の片方のチオレートだけが金表面に結合していることを示唆した。実際にオクタンチオール修飾金ナノ微粒子をその上に修飾すると、ジチオール誘導体のSAM上にのみ金ナノ微粒子が結合し、単層膜ができることが、STM観察により示された。
    3)ポルフィリン誘導体を用いる金クラスターの光界面凝集 アンモニウム塩で表面安定化した金クラスターとポルフィリンテトラチオアセテート誘導体の混合トルエン溶液に赤外光を当てると、ポルフィリンで金クラスターを架橋した薄膜が生成することを見出した。

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  • コロイド・界面の分子機能化による電子プロセス制御

    Grant number:12895023  2000

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    小山 昇, 戸嶋 直樹, 谷口 功, 魚崎 浩平, 益田 秀樹, 西原 寛

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    Grant amount:\3200000 ( Direct Cost: \3200000 )

    本基盤研究では、これまで電子移動の反応場としてほとんど取り扱われることがなかったコロイド、ミセル、微粒子などの新しい界面の電子移動反応の制御に関する研究を取り扱った。特に、従来の電子移動界面を多重構造化して形成される連続ポテンシャル場を用いることにより、電子移動の高度な時間および空間制御を達成する研究分野に対して企画調査を行った。
    具体的には、電子相関固体物質分子の多彩な組み合わせが織り成す様々な界面における電子移動現象を4つの新しい観点から調べた。
    第1に、その三次元的構造やサイズが精密かつ複雑に制御されたナノ微粒子とコロイド分散系を構築し、新しい電子分子機能を発現させる研究について調査を行った(彌田、岩橋、戸嶋、西原、松本)。
    第2に、新しい分子合成技術で生み出されるミセルやゲルのような超分子系における電荷移動キャリア(電子やイオン)の空間的および時間的な動的挙動の解析と随意な電荷移動の実現に関する研究調査を行った(岩橋、辻井、谷口)。
    第3に、異なるレドックス機能体を微小空間にヘテロ高密度配列させて分子回路を形成し、電子経路のマッピングを行った(大坂、魚崎、桑畑、谷口、辻井、中戸、中林、益田)。
    第4に、上記に示した分子機能界面を組み合わせ、集積化したシステムを高性能電池、光デバイス、化学センサー、触媒、医薬・化粧品などに応用、具現化するための研究に関する調査を行った(小山、相澤、金村、橋本、藤嶋、渡辺)。
    第1回目の全員参加の企画調査会を平成12年8月24日〜26日の期間、北海道大学理学部で行った。また、第2回目の調査交流会を11月5日〜8日に行われた日本化学会コロイド界面部会の25周年国際シンポジウム(東京、市ヶ谷)への協賛という形で行い、海外からの著名な研究者も多数参加した。また、平成12年8、9、10、11月に、本基盤研究(C)(1)研究代表者および研究分担者(小山、西原、相澤、益田、中林、岩橋、金村、谷口、戸嶋、大坂、渡辺)が中心となり、(a)高次ナノ構造体、(b)電子ナビゲーションおよび(c)化学デバイスをキーワードとして計7回の調査行い、特定領域への発展の具体化を図る調査も行った。

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  • Creation of multi-dimensional structures of functional molecules by metal complexation reactions

    Grant number:11309003  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    NISHIHARA Hiroshi, KURIHARA Masato, KUBO Kenya

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    Grant amount:\30760000 ( Direct Cost: \29800000 、 Indirect Cost:\960000 )

    To construct new multi-dimensional functional molecular systems by utilizing complex reactions of transition metal complexes has been investigated in this research project. The molecular systems that have been focused are 1) azo-conjugated metal complexes with photo-functions, 2) donor-acceptor conjugated complexes with an ability of proton-coupled intramolecular electron-transfer reactions, and 3) metal nanoparticles modified with redox- and photo-functional complexes. The summary of the results is as follows.
    The trans-to-cis isomerization of azoferrocene proceeds not only by the photoexcitation of the π-π^* transition band but also by photoexcitation of the MLCT (d-π^* transition) band. The trans/cis ratio of the azobenzene-attached bipyridine ligands in their cobalt complex is reversibly altered by a combination of photoirradiation with a single UV light source and the reversible redox change between Co(II) and Co(III). A newly synthesized Ni, Pd and Pt tolylazophenylenedithiolato complexes 2-4 show reversible trans-to-cis photoisomerization, proto-chromism, and novel proton-coupled cis-to-trans isomerization.
    The protonation to carbonyl groups of the anthraquinone moiety in 1 -ferrocenylethynylanthraquinone causes intramolecular electron transfer leading to a novel structural change into a η^6-fulvene-cumulene Fe(II) complex. A 2:1 donor-acceptor complex, l,5-bis(ferrocenylethynyl)anthraquinone undergoes a two-step proton response, and the doubly protonated species involves a η^6-fulvene-Fe(II) complex-cumulene structure, and a novel spin-separated form of a ferrocenium (Fe(III)) ion and a semiquinone radical in the solution. Furthermore, the complex is in a thermal equilibrium between the valence tautomers of a donor-acceptor system in the solid state.
    Synthesis and electrochemical deposition behavior of biferrocene and anthraquinone derivative-modified Au and Pd clusters have been investigated. It is also possible to fabricate hetero structures by alternative electrodeposition of Bfc-modified gold and palladium nanoparticles.

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  • 混合原子価錯体高分子の導電性の光スイッチング

    Grant number:11167217  1999

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    西原 寛, 栗原 正人

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    Grant amount:\2000000 ( Direct Cost: \2000000 )

    本研究では、アゾ基でレドックス錯体ユニット同士を連結した多核錯体、高分子錯体を対象とし、様々な物性を光照射によって可逆的にスイッチすることができる系を創製することを目的とする。具体的には、1)アゾ架橋フェロセンオリゴマーおよびポリマーの物性と光異性化反応、および2)アゾ架橋ビピリジン、テルピリジンおよびそれらを配位子とする錯体の合成、物性と光異性化反応、の研究を行なった。
    アゾ架橋フェロセンオリゴマー、ポリマーの合成においては、既知の二量体であるアゾフェロセンの他に、新規な二種の三量体およびポリマーの合成に成功した。アゾフェロセンについては、トランス体のX線結晶構造を明らかにした。またこれらのアゾ架橋フェロセンオリゴマー多核錯体のレドックス特性および混合原子価状態における光学特性を種々の溶媒中で測定し、フェロセン核間の電子相互作用に及ぼす溶媒効果などを系統的に解析した。さらに、アゾ架橋フェロセンオリゴマーがDMSOやベンゾニトリルなどの溶媒中で光異性化反応を起すことを見出した。アゾフェロセンの光異性化により生じたシス体は、トランス体に比べて卑なレドックス電位をもち、また混合原子価状態の熱力学的安定性を示す2段のレドックス電位の差はトランス体より小さく、シス体の立体的歪みによるπ共役の低下が起こると解釈された。
    アゾベンゼンで架橋した新規ビスビピリジン、テルピリジン配位子を合成し、さらにそれらのロジウム、ルテニウム、コバルト複核錯体を合成した。それらの配位子および錯体の光異性化反応およびレドックス特性、光学特性等を調べ、光異性化反応に及ぼす中心金属、対イオン、溶媒の顕著な効果を見出した。

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  • 新反応系の合理的設計

    Grant number:09238101  1999

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    中村 栄一, 黒沢 英夫, 北村 雅人, 西原 寛, 杉浦 幸雄

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    Grant amount:\151400000 ( Direct Cost: \151400000 )

    「新反応系の合理的設計」という本研究の目的を達成するために5名の研究者の協力のもとに,反応動力学,構造論,反応理論,そして斬新な経験則などに基づく堅固な作業仮説を構築して反応系を設計し,その結果,以下のような成果を得た.
    (1)新反応系の合理的設計:本重点領域研究のひとつの座標軸,すなわち合理的反応設計の座標軸に添って新指導原理を探求した結果,有機銅化合物の反応の新規な反応機構を提唱した.
    (2)触媒機構の定量的考察:有機亜鉛化合物によるアルデヒド類の鏡像面選択的アルキル化反応において観測される不斉増幅現象を取り上げ研究した.速度論実験を中心に,分子スペクトルやX線回折をもとに反応系構成分子の静的・動的挙動を調査し,現象発現の分子機構の徹底解明を目指し,実測可能な変数設定により反応系を数式表現し、定量的考察への道を拓くことができた.
    (3)希原子価有機遷移金属活性種の化学:合成に用いられる遷移金属のなかでパラジウムの占める役割は極めて大きい.本研究では1価や4価の原子価を有するパラジウム活性種やヘテロ元素配位子を持つパラジウム活性種の新規変換反応を探索し,新型炭素一炭素結合生成法開発の糸口を見い出すことができた.
    (4)一次元π共役系伝導体の開発:遷移金属錯体のメタラサイクリング重合法によって高分子錯体、ポリメタラシクロペンタジエニレン類を合成した.完全なる位置選択性および強い金属核間電子相互作用を持つ系を達成し,新しい物性の一次元π共役系の構築を行った.
    (5)核酸認識を基盤とする新反応系の設計と展開:新規リボザイムの合理的設計によって開発したアロステリックリボザイムの新反応を展開すると共に,DNAの長い塩基対(20〜30塩基対)を認識できる新しい人工分子としての亜鉛フィンガーペプチドの新規設計と機能を追究し,人工制限酵素や人工リプレッサーとしての展開を行った.

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  • 傾斜型電子構造をもつ一次元共役多核錯体の合成と物性

    Grant number:11136207  1999

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    西原 寛, 栗原 正人

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    Grant amount:\1800000 ( Direct Cost: \1800000 )

    本研究では、異なるレドックスユニットを共役鎖で連結した一次元のポテンシャル傾斜場の構造と物性を解明することを目的とし、本年度は、ドナーとしてフェロセン、アクセプターとしてキノンがπ共役結合した錯体について研究した。
    新化合物 1-ferrocenylethynylanthraquinone(1),1-ferrocenyIethynylanthraquinone(2),1,8-diferrocenyl-anthraquinone(3),および1,8-diferrocenylanthraguinone(4)を合成し、1,2および3については、X線結晶構造解析を行った。その結果、1,3においては、フェロセニル基のCp環の面はアントラキノンの面とほぼ垂直であるが、2では両面がほぼ平行であるという大きな違いがみられた。
    Bu_4NClO_4/CH_2Cl_2中のサイクリックボルタモグラムにおいては、全錯体においてフェロセンとキノンに由来する酸化還元波が現れ、複核錯体3では、フェロセンサイト間の電子相互作用のために、フェロセンの2段の1電子酸化波が観測された。
    1のCH_2Cl_2溶液にCF_3COOHを加えていくと、アントラキノン部位の還元電位が貴側にシフトし、吸収スペクトルの変化からキノン部位とフェロセン部位の電荷移動相互作用が大きくなることを示した。さらに、CF_3SO_3Hとの1:1の反応により、アントラキノンのOにH^+が付加し、フェロセンサイトからの電子移動が起こることによって形成されるクムレニデン型錯体を合成単離した。3は、基本的に1と類似の挙動を示した。一方、2のプロトン存在下での挙動は上記錯体と大きく異なり、共役系の物性が置換位置に大きく依存することが示された。
    以上の結果より、キノン-フェロセン共役錯体においてはH^+付加と電子移動に伴い、ユニークな構造・物性変化が起こることが示された。

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  • Chemical Functions of Transition Metal Assembled Complexes

    Grant number:10149102  1998 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Priority Areas (A)

    ITO Tasuku, NISHIHARA Hiroshi, HAGA Masa-aki, SASAKI Yoichi, FUJITA Makoto

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    Grant amount:\77600000 ( Direct Cost: \77600000 )

    Ito, using infrared spectral lineshape analysis in conjunction with infrared spectroelectrochemistry, determined the rates of intermolecular electron transfer between triruthenium cluster units in mixed valence complexes. The electron transfer rates along a "non symmetric potential energy surface" were elucidated and multiple electron transfer pathways and rates in a bridged cluster trimer were identified. As well as the electronic properties of cluster complexes, methods for assembling extended structures were examined. Using Pt complexes coordinated by high field ligands, strong unsupported Pt->M dative bonds were prepared, and when the Pt complexes were reacted with Ag ion or Rh dimers, linear and large multinuclear complexes were isolated.
    Sasaki examined two areas: ligand-metal interactions and the synthesis of large complexes. In the first project, the stability of mixed valence states formed by ligand based redox processes were studied, and it was discovered that, when the metal centers and ligands mutually form mixed valence states, a "double mixed valence state" exists. In the second area hexanuclear rhenium complexes with new multidentate units were prepared and the structure of a rhenium hexamer having six large pyridylporphyrin ligands was determined.
    Nishihara's research involved induced structural changes in transition metal complexes. Azo-conjugated transition metal complexes undergo a reversible trans-to-cis isomerization upon concomitant irradiation with a single UV light source and oxidation of the metal. Protonation of a ヲミ-conjugated ferrocene-anthraquinone system caused intermolecular electron transfer to occur. This leads to a novel structural change creating an ヲヌ^6-fulvene-cumulene Fe(II) complex. The structure of the proton attached complex and the properties of the unusually fluxional complex were elucidated.
    Haga prepared multilayered metal complexes on a solid electrode through layer-by-layer growth. As well, a two-dimensional coordination system was developed at the air-water interface using Langmuir-Blodgett techniques.
    Fujita furthered his research involving the construction of 2-D and 3-D complexes using 2,4,6-tris(4-pyridyl)triazine as a bridging ligand. An interesting 3-D network, which undergoes a reversible structural change in the solid state upon absorption/desorption of a guest molecule, was prepared.

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  • 傾斜型電子構造をもつ一次元共役高分子錯体の合成と物性

    Grant number:10149211  1998

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    西原 寛, 栗原 正人

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    Grant amount:\1500000 ( Direct Cost: \1500000 )

    本研究では、共役鎖で遷移金属錯体ユニット同士を連結した一次元鎖からなり、主鎖中における錯体ユニットの電子構造が規則的かつ連続的に変化するポリマー錯体およびオリゴマー錯体を研究対象とする。本年度は、フェロセノファンの熱開環重合法によるヘテロ原子架橋フェロセン共重合体の合成研究と、アゾ架橋配位子の合成研究を行なった。
    Si,Ge,Pなどのへテロ原子で両方のCp環を架橋したフェロセノファンは、架橋原子団に依存して異なる温度で熱開環重合反応を起し、異なる酸化還元電位を持つレドックス共役ポリマーを与える。本実験では幾つかのフェロセノファンの組合せを検討した結果、[Fe(η^5,η^5-C_5H_4SiMe_2C_5H_4)](1)と[Fe(η^5,η^5-C_5H_4PPhC_5H_4)](2)の組合せが、融点、熱開環温度、レドックス電位の観点から、共重合体の合成に適した系であると判断し、さらに、両モノマーの比率と温度負荷条件による共重合体の生成について調べた。1は単独では2よりも低温で融解し、高温で開環重合を行なう。DSCの結果から、両者の混合体においては、1と2のモル比、Si/P>1/1のときは、2と1が分離して重合するが、Si/P<1/1のときは,1の重合温度が単独の場合より低くなり、共重合体が多く生成することが示唆された。この結果は、生成物のIRスペクトルや電気化学的性質からも支持された。さらに、定温開環反応の経時変化を調べたところ、l30℃あたりではまず2単独の重合が起こり始め、それとわずかな時間差で1と2の共重合が起こり始めることが示された。以上の結果から、1と2のモル比や温度を変化させることで、共重合体の組成分布等を制御できることを示唆された。
    逐次合成法による傾斜構造型オリゴマー錯体の合成を行うための配位子として、テルピリジンやジカルコゲノレン系のアブ架橋型多座配位子を新規合成した。

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  • 界面の構造と電子移動ダイナミクス

    Grant number:09237101  1997 - 1999

    日本学術振興会  科学研究費助成事業  特定領域研究(A)

    魚崎 浩平, 大澤 雅俊, 板谷 謹吾, 藤平 正道, 西原 寛

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    Grant amount:\91000000 ( Direct Cost: \91000000 )

    電極反応における構造・電子状態と反応性の関係を明らかにすることを目標に研究を行った。以下に本年度の成果を示す。
    Au(111)およびAu(100)単結晶表面上に電気化学エピタキシャル成長で形成した白金やパラジウムの超薄層のin situ構造決定をシンクロトロン放射光を用いる表面X線散乱法により行った。また電極触媒活性がバルクとが大きく異なることを見い出した(魚崎)。
    NH4F溶液中での銅の無電解過程中のSi(111)表面の化学状態(魚崎)をATR-IR法によりその場観察し、エッチング・酸化、電析過程を詳細に調べた。
    高度な機能を持つ自己組織化単分子層(SAM)の構築の為に、修飾溶媒や温度の欠陥密度に及ぼす効果を明らかにした(魚崎)。また、Au(111)上のビフェロセン基を持つSAMの電気化学特性を明らかにするとともに、レドックス活性基を持つSAMで修飾した金クラスターの電気化学的凝集と形成薄膜の物性評価を実施した(西原)。さらに、SAMの相転移・分離および脱離挙動について検討した(藤平)。この他、アルカンが融点以上の温度でAu(111)やAu(100)の表面で二次元結晶を形成することを見い出した(魚崎)。
    Pt(111)、Cu(111)やAu(111)上の有機物、Ir(111)上の硫酸イオン、Ni(111)上のヨウ素の吸着構造を電解質溶液中でのin situ STM測定(板谷、大澤)およびIRAS測定(大澤)によって検討し、電極反応との関連について議論した。また、表面和周波発生分光法により固液界面の分子構造を決定した(魚崎)。さらに、時間分解赤外測定を電気化学測定と組み合わせて、Au(111)上のupd Cuの溶解過程について詳細に検討し、硫酸種が脱離した後Cuの溶解が起こることを示した(大澤)。

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  • Correlation between structures and physical properties for pi-conjugated multinuclear complexes

    Grant number:09440226  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NISHIHARA Hiroshi, KURIHARA Masato

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    Grant amount:\12300000 ( Direct Cost: \12300000 )

    In the research of 7t-conjugated multinuclear transition metal complexes, it is important to investigate the correlation between structures and strength of intermuclear electronic interactions with physical properties. In this study, we have synthesized new oligomeric and polymeric compounds involving ferrocene, cobaltadithiolene and terpyridine complexes, and investigated the correlation between their structures and redox, optical and magnetic properties.
    New azo-bridged ferrocene trimers, Fc-Fc'-N=N-Fc and Fc-N=N-Fc'-N=N-Fc, where Fc and Fc' refer to (eta^5-C_5H_5)Fe(eta^5-C_5H_4-) and Fe(eta^5-C_5H_4-)_2, respectively, were synthesized. Their electrochemical and optical properties indicate that the electronic structures of their mixed-valence states can be expressed as Fc^+-N_2-Fc'-N_2-Fc, Fc^+-N_2-Fc'-N_2-Fc^+, and Fc^+-Fc'-N_2-Fc, Fc^+-Fc' -N_2-Fc^+, respectively. The solvent effect of the IT band in their mixed-valence states on nu_<max> cannot be interpreted only by the parameters in the Marcus-Hush theory, indicating that the nature of the solvent as donor or acceptor should be taken into account in the electron-exchange process in the mixed-valence states.
    Redox properties and optical properties of o, m, and p-bis (ferrocenylethynyl) benzene indicate that the electronic interaction between ferrocene units is most significant when they locate at para position. Physical properties of hexaxis (ferrocenylethynyl) benzene can be semi-quantitatively interpreted by considering the contribution of all electronic interaction between ferrocene units at o, m and p-positions.
    New Co-M-Co (M=Mo, W) cluster complexes were synthesized by the reaction of cobaltadithiolene complex with M(CO)_3py_3 and their X-ray crystallographic structures determined. Physical properties of them and their reduced forms indicate the existence of strong electronic interaction between two Co sites via the central metal.
    A new bis (terpyridine) ligand with azobenzene as the linker, tpy-AB-tpy and their Rh, Ru and Co dinuclear complexes were synthesized. Their photoisomerization reactions and redox properties were revealed.

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  • ポリメタロセン電荷移動錯体の合成とその光・電子機能

    Grant number:07640761  1995

    日本学術振興会  科学研究費助成事業  一般研究(C)

    西原 寛

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    Grant amount:\1400000 ( Direct Cost: \1400000 )

    フェロセンは可逆なレドックス種であり、有機πアクセプターとの電荷移動錯体はユニークな光学的、磁気的性質を持つことが知られている。したがって、フェロセンを直接連結したオリゴ及びポリ(フェロセニレン)は、レドックスサイト線形結合系におけるサイト間電子的相互作用と電気化学的特性との相関を調べるのに有効であるとともに、その電荷移動錯体の物性は興味深い。しかしながらこれまで、その溶解性の低さから十分な研究が行われていなかった。本研究では、新規合成した可溶性オリゴ(フェロセニレン)を用いて、レドックスサイト線形結合系に関する理論的考察を検証するとともに、可溶性ポリ(フェロセニレン)の電荷移動錯体の光伝導性を見出した。
    まず、7核までの可溶性オリゴ(1,1'-ジヘキシルフェロセニレン)を合成単離し、それらのレドックス特性を調べることによって、核数とレドックス電位との相関を明らかにした。その結果、レドックスサイト線形結合系において隣接する酸化サイト(O)-還元サイト(R)2極間の相互作用エネルギーU_<OR>にさらに3極間相互作用エネルギーU_<OXR>を導入した理論によって説明できることを明らかにした。次に,鉄カルボニル基を末端に結合したフェロセン単量体、二量体、三量体を合成し、酸化過程におけるカルボニルの赤外吸収変化をモニターすることにより、レドックスの過程の構造変化のセンシングを行った。例えは三量体では、[R-R-R-Fe(CO)_3]→[R-O-R-Fe(CO)_3]→[O-R-O-Fe(CO)_3]→[O-O-O-Fe(CO)_3]に伴う変化を観測したが、これはU_<OR>にもとづく理論と一致するものである。
    一方、分子量4千以上のポリ(1,1'-ジヘキシルフェロセニレン)の電荷移動錯体の導電性、光伝導性について検討した結果、TCNE錯体がp型半導体特性にもとづく顕著な光伝導性を示すことを見いだした。

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  • 複数の混合原子価状態をもつπ共役多核錯体の分光電気化学

    Grant number:07215277  1995

    日本学術振興会  科学研究費助成事業  重点領域研究

    西原 寛

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    Grant amount:\1600000 ( Direct Cost: \1600000 )

    複数の遷移金属錯体ユニット間をπ共役鎖で連結した多核錯体系は、金属サイト間の電子及びスピン相互作用のために、興味深い電子、光、磁気物性を発現する。したがってπ共役鎖が十分長くなれば、‘導電性高分子錯体'と呼べる機能性物質群を形成することが期待される。この観点から、本研究では、2核から多核にわたる幾つかのπ共役錯体について、特に混合原子価状態における金属-金属電子相互作用に関する研究を分光電気化学手法を用いて行った。
    フェロセンの共役二量体BFDの誘導体、[Fe_2(C_<10>H_8)(C_<10>H_7CCl=CHCHO)](1)の電解重合膜をITO電極上に形成し、混合原子価状態、BFD^+におけるITバンドとComproportionation constant, K_cに及ぼす対イオンの効果について検討した。その結果、ITバンドは殆ど電解質アニオン(対イオン)の種類に依らないが、K_cはイオン対形成の違いによって、HSO_4^-<ClO_4^-<BF_4^-<PF_6^-の順に増大することが明らかとなった。この結果は、金属間の電子非局在化の大きなclass IIIの特徴といえる。
    共役環状三量体[Co_3Cp_3(S_6C_6)](Windmill complex, 2)の二つの混合原子価状態(Co(III)Co(III)Co(II)およびCo(III)Co(II)Co(II))におけるITバンドとK_cに及ぼす対イオンの効果について検討した。その結果、K_cは電解質カチオン(対イオン)及び溶媒の種類に大きく依存し、その依存性は溶媒和イオンの大きさと強い相関を示した。また2^-および2^<2->のITバンドから見積もられるmixing coefficient, αも溶媒和対イオンサイズの増加とともに大きくなり、class II錯体の特徴を示した。
    その他、π共役有機金属高分子錯体や電解重合ルテノセン薄膜の研究を行った。

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  • 複数の混合原子価状態をもつπ共役多核錯体の分光電気化学的研究

    Grant number:06226274  1994

    日本学術振興会  科学研究費助成事業  重点領域研究

    西原 寛

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    Grant amount:\1800000 ( Direct Cost: \1800000 )

    1,2‐エチレンジチオラト錯体[CpCoS_2C_2H_2]を脱水素縮合することにより、π共役した二量体や環状三量体が生成した。単量体、二量体[(CpCoS_2C_2H)_2]、環状三量体[CpCo(S_2C_2)]_3の順に、λ_<max>が551,640,688nmと長波長側にシフトし、π共役系の拡がりを支持した。環状三量体は、電気化学的に三段階の1電子還元をうけ、Co(III)Co(III)Co(III)から2段の混合原子価状態を経てCo(II)Co(II)Co(II)へ還元されることが明らかとなった。Bu_4NClO_4‐THF系におけるITバンドの解析からCo(II)Co(II)Co(III)の方がCo(II)Co(III)Co(III)よりも金属間の電子的相互作用が強いと考えられる。[CpCo(S_2C_2)]_3のNa還元では上記結果と対応する三段階のESRスペクトル変化を示し、特にCo(II)Co(II)Co(III)においては一重項ビラジカルとなるが、Co(II)Co(II)Co(II)においては3つのスピンが強磁性的相互作用を示すという興味深い結果が得られた。
    メタラサイクルπ共役高分子錯体の合成として、CpCo(PPh_3)_2と共役ジアセチレンHC≡C‐A‐C≡CH(A=1,4‐phenyleneなど)との反応を行ったところ、高収率で不溶性のpoly(arylene cobalta‐cyclopentadienylene)が得られた。さらに(hexCp)Co(PPh_3)_2を原料とするとポリマーが可溶性となることを見いだした。これらの高分子錯体の酸化電位は単核錯体と殆ど同じであり、還元電位は重合度の増加と共に貴側へシフトするという特徴を示し、このことはπ共役系軌道のLUMOへの大きな寄与を意味している。

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  • 有機金属反応を利用した新しいpi共役有機金属高分子錯体材料の創製

    Grant number:05640659  1993

    日本学術振興会  科学研究費助成事業  一般研究(C)

    西原 寛

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    pi共役有機高分子と遷移金属錯体を融合した系、“pi共役遷移金属錯体高分子"においては、pi共役系がd軌道と多様な電子的相互作用をすることにより、ユニークな物性を発現することが期待される。本研究では大別して2つのpi共役高分子錯体の合成法を開発し、それらの電子物性、光物性について研究した。以下にそれぞれの概要を述べる。
    1)可溶性ポリフェニレン、ポリインデン、ポリフルオレン誘導体を配位子とする遷移金属pi錯体。 eta^6‐配位またはeta^5‐配位のpi配位子であるベンゼン、インデン、フルオレンを一次元に長く連結したpi共役高分子は、pi結合によって遷移金属と融合させることができる。本研究ではn‐ヘキシル基を導入した可溶性ポリフェニレン、ポリインデン、ポリフルオレン誘導体を電解合成し、さらにそれらを用いる均一系反応によって、(arene)FeCp,(indeny)RhCp^*,(fluoreny)Mn(CO)_3,などのレドックス機能をもつ遷移金属錯体ユニットを含む系を構築した。いずれの系においても錯体ユニットに基づくレドックス特性が現われ、幾つかの系においては、錯形成に伴う導電率の上昇、吸収スペクトルの吸収端の長波長側へのシフト(バンドギャップの減少)、発光スペクトルの波長と強度の変化が観測された。
    2)ジアセチレンの連続的メタラサイクル形成反応によるコバルタシクロペンタジエン高分子錯体の合成。 ジエチニルベンセン類の[CpCo(PPh_3)_2]への二連続的メタラサイクル形成反応によって、ポリアリレンコバルタシクロペンタジエニレンフェニレン類を合成した。これらの新規高分子のバンドギャップは2.1‐2.3eVであり、低温でのCVにおいては、準可逆な酸化波と殆ど不可逆な還元波を示す。単核錯体と比較すると、その酸化電位はほぼ同じであるが還元電位は貴側へシフトしている。またこれらの高分子錯体は溶媒に不溶であるが、Cp環にn‐ヘキシル基を導入した錯体原料[(hex‐Cp)Co(PPh_3)_2]を用いることによって、可溶性の高分子錯体を得ることができた。

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  • π-共役系、有機金属導電性高分子の合成と物性

    Grant number:04640585  1992

    日本学術振興会  科学研究費助成事業  一般研究(C)

    西原 寛

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    Grant amount:\2300000 ( Direct Cost: \2300000 )

    π共役有機金属錯体高分子の新規合成法として以下に示す二種の方法を開発した。その一つはM^5-シクロペンタジエニルビス(トリフェニルホスフィン)コバルトと4、4^´-ジエチニルビフェニルおよびp-ジエチニルベンゼン類との反応によるポリ(4、4^´-ビフェニレンコバルタシクロペンタジエニレン)およびポリ(コバルタシクロペンタジエニレンp-フェニレン)類を合成する方法である。この反応はメタラサイクル形成反応を高分子合成に利用した最初の例である。合成したコバルタシクロペンタジエニレン高分子錯体は長く共役したπ電子系に基づく強い吸収を500nm付近にもつ。この可視吸収スペクトルや電気化学測定より求めた酸化電位と還元電位より算出したバンドギャップの値は 1、2〜1、8eVとこれまでに知られているπ共役高分子の値と比較して小さい部類の値であり、またイオン化ポテンシャルは3、9〜 4、2eV程度であった。これらの新規高分子の導電率などの他の物性値についても明らかにした。
    第二のπ共役有機金属錯体高分子の合成法は、可溶性のπ共役有機高分子を配位子として用いる方法である。可溶性π共役高分子の合成法として、長鎖アルキル基をもつベンゼン誘導体の電解酸化重合によるポリ(n-アルキルフェニレン)の合成法を確立した。これらの高分子をクロムやモリブデンのカルボニル錯体と反応させることにより、アレーンメタルトリカルボニルユニットを含む可溶性のπ共役有機金属錯体高分子を合成した。これらの新規高分子錯体の導電率、電気化学的性質などを明らかにし、特にπ共役系の電子移動とレドックス伝導の混成による導電率の上昇を観測した。

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  • 界面分子集合体に関する研究

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  • Study on Conducting Metal Complex Polymers

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  • 導電性高分子錯体に関する研究

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  • 多核錯体に関する研究

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