Faculty Profiles - HIFUMI RYOYU

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HIFUMI RYOYU

Organization

School of Materials and Chemical Technology Associate Professor

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Degree

工学博士 ( 2019.3 東京工業大学 )
工学修士 ( 2012.3 京都大学 )

Research Areas

Nanotechnology/Materials / Polymer chemistry
Nanotechnology/Materials / Polymer materials
Nanotechnology/Materials / Synthetic organic chemistry

Education

Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering Department of Electronic Chemistry

2015.4 - 2018.3

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Kyoto University Graduate School of Engineering Department of Polymer Chemistry

2010.4 - 2012.3

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Kyoto University Faculty of Engineering School of Industrial Chemistry

2006.4 - 2010.3

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Research History

Tokyo Institute of Technology Assistant Professor

2021.4

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JSR株式会社

2012.4 - 2021.3

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Papers

Orthogonal Synthesis of Cationic Azatriphenylene Derivatives for Aggregation-Induced Emission (AIE) and Aggregation-Caused Quenching (ACQ) Property Switching

Yushi Ohno, Tsukasa Ehara, Kosuke Sato, Ryoyu Hifumi, Ikuyoshi Tomita, Shinsuke Inagi

Organic Letters 2025.5

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Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.orglett.5c01277

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Tetraarylphosphonium Cations with Excellent Alkaline‐Resistant Performance for Anion‐Exchange Membranes

Ryoyu Hifumi, Yoshikazu Toyama, Keisuke Ikeda, Tetsuaki Hashimoto, Tomohiro Imai, Shinsuke Inagi, Ikuyoshi Tomita

ChemSusChem 2025.5

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

<jats:p>To realize the robust anion exchange membrane (AEM)‐based water splitting modules and fuel cells, the design and synthesis of tetraarylphosphonium (TAP) cations are described as a new class of cationic building blocks that exhibit remarkable alkaline stability under harsh conditions. TAP cations with highly sterically demanding aromatic substituents were efficiently synthesized from triarylphosphine derivatives and highly reactive arynes, whose alkaline degradation proved to be suppressed dramatically by the sterically demanding substituents. In the case of bis(2,5‐dimethylphenyl)bis(2,4,6‐trimethylphenyl)phosphonium, for example, approximately 60% of the cation survived for 27 d under the forced conditions (i.e., in 4 M KOH/CD3OH at 80 °C), while tetraphenylphosphonium degraded completely within 10 min in 1 M KOH/CD3OH at that temperature. Through the decomposition of the alkaline stable TAP cations, not only triarylphosphine oxides, which are often reported to form via the nucleophilic attack toward the cationic phosphorus center, but also triarylphosphines were detected, which suggested the presence of other degradation mechanisms due to the sterically demanding aromatic substituents. In kinetic analyses, bis(2,5‐dimethylphenyl)bis(2,4,6‐trimethylphenyl)phosphonium was found to exhibit 52 times higher stability compared to benzyltrimethylammonium, which is often employed as the cationic building block for AEMs.</jats:p>

DOI： 10.1002/cssc.202402366

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Synthesis of Triarylsulfonium Salts with Sterically Demanding Substituents and Their Alkaline Stability

Tomohiro Imai, Ryoyu Hifumi, Shinsuke Inagi, Ikuyoshi Tomita

The Journal of Organic Chemistry 2025.3

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Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.joc.4c03147

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Synthesis of phosphine sulfide group-containing aromatic poly(ether)s with aliphatic substituents on the phosphorus atoms and low dielectric properties

Ryoyu Hifumi, Kotaro Ochiai, Ikuyoshi Tomita

Polymer Journal 2024.11

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Publishing type：Research paper (scientific journal)

DOI： 10.1038/s41428-024-00940-7

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Low Dielectric, Good Adhesive, and Flame-Retardant Aromatic Poly(ether)s with Phosphine Sulfide Groups

Ryoyu Hifumi, Ikuyoshi Tomita

Macromolecules 2024.9

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Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.macromol.4c01440

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An ionic liquid containing arsonium cation

Ryoto Inaba, Tomohiro Imai, Showa Kitajima, Hitoshi Kasai, Kouki Oka, Ryoyu Hifumi, Ikuyoshi Tomita, Masahiro Yoshizawa-Fujita, Kensuke Naka, Hiroaki Imoto

Chemical Communications 2024

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

<jats:p>We report the first arsonium-based ionic liquid, which shows lower viscosity, higher ionic conductivity, and comparable stability to phosphonium-based ones, expanding the range of ionic liquids beyond traditional ammonium and phosphonium cations.</jats:p>

DOI： 10.1039/d4cc05072j

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Synthesis of 1,1,4,4-tetra-aryl-1,3-butadienes possessing sulfur substituents at 2,3-positions via dithiol intermediates and their characteristic electrochromic behaviors

Eguchi, H., Hifumi, R., Nishiyama, H., Inagi, S., Tomita, I.

Chemistry Letters 53 ( 1 ) 2024

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Publishing type：Research paper (scientific journal)

DOI： 10.1093/chemle/upad017

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Preparation of superhydrophobic surfaces and slippery liquid-infused porous surfaces based on core-cross-linked nanostructured materials obtained by living coordination block copolymerization through PISA process

Cheng, Y., Wakiya, T., Hifumi, R., Inagi, S., Tomita, I.

Polymer 294 2024

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Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.polymer.2024.126686

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Parallel synthesis of donor-acceptor π-conjugated polymers by post-element transformation of organotitanium polymer Reviewed

Matsumura, Y., Tanudjaja, A., Fukushima, M., Higuchi, M., Ogino, S., Ishidoshiro, M., Irie, Y., Imoto, H., Naka, K., Hifumi, R., Inagi, S., Tomita, I.

Designed Monomers and Polymers 26 ( 1 ) 190 - 197 2023.12

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Publishing type：Research paper (scientific journal)

DOI： 10.1080/15685551.2023.2233228

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Cathodic Hydrodefluorination of a π-Conjugated Alternating Copolymer Consisting of 9,9-Dioctylfluorene and Tetrafluorophenylene

Satoshi KOISO, Tomoyuki KURIOKA, Ryoyu HIFUMI, Ikuyoshi TOMITA, Shinsuke INAGI

Electrochemistry 91 ( 11 ) 112012 - 112012 2023.11

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Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan

DOI： 10.5796/electrochemistry.23-67077

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Synthesis, Structures, and Aggregation-Induced Emission Properties of Distyrylbenzene Derivatives Containing Fluorine Groups

Furusho, D., Shida, N., Hifumi, R., Tomita, I., Inagi, S.

Journal of Organic Chemistry 88 ( 20 ) 2023.10

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Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.joc.3c01718

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Site‐Selective Synthesis and Concurrent Immobilization of Imine‐Based Covalent Organic Frameworks on Electrodes Using an Electrogenerated Acid

Tomoki Shirokura, Tomoki Hirohata, Kosuke Sato, Elena Villani, Kazuyasu Sekiya, Yu-An Chien, Tomoyuki Kurioka, Ryoyu Hifumi, Yoshiyuki Hattori, Masato Sone, Ikuyoshi Tomita, Shinsuke Inagi

Angewandte Chemie International Edition 2023.6

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

DOI： 10.1002/anie.202307343

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Synthesis of Cationic Azatriphenylene Derivatives by Electrochemical Intramolecular Pyridination and Characterization of Their Optoelectronic Properties

Yushi Ohno, Shogo Ando, Daisuke Furusho, Ryoyu Hifumi, Yuuya Nagata, Ikuyoshi Tomita, Shinsuke Inagi

Organic Letters 25 ( 21 ) 3951 - 3955 2023.5

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

DOI： 10.1021/acs.orglett.3c01341

Web of Science

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n-Conjugated organometallic polymer containing n-extended dithienotitanacyclopentadiene units by Sonogashira-Hagihara cross-coupling polycondensation

Alvin Tanudjaja, Ryoyu Hifumi, Shinsuke Inagi, Ikuyoshi Tomita

POLYMER 241 2022.2

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

DOI： 10.1016/j.polymer.2021.124511

Web of Science

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Synthesis and optoelectronic properties of air-stable π-conjugated polymers containing both thiophene-2,5-diyl and fused titanacycle units Reviewed

Alvin Tanudjaja, Makoto Higuchi, Tomohiro Imai, Yoshimasa Matsumura, Ryoyu Hifumi, Shinsuke Inagi, Ikuyoshi Tomita

Polymer Chemistry 13 ( 30 ) 4446 - 4452 2022

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

DOI： 10.1039/d2py00452f

Web of Science

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High refractive and low birefringent materials based on Poly(arylene ether phosphine oxide)s and Poly(arylene ether phosphine sulfide)s

Ryoyu Hifumi, Ikuyoshi Tomita

Polymer 186 2020.1

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Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.polymer.2019.121855

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Birefringent properties of poly(phosphonate)s and poly(thiophosphonate)s derived from various bisphenols

Ryoyu Hifumi, Ikuyoshi Tomita

Polymer Journal 2019

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Publishing type：Research paper (scientific journal)

DOI： 10.1038/s41428-019-0200-9

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Low Birefringent Properties of Poly(phosphonate) Derivatives

Ryoyu Hifumi, Ikuyoshi Tomita

Macromolecules 51 ( 15 ) 5594 - 5599 2018.8

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Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.macromol.8b00684

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Synthesis and high refractive index properties of poly(thiophosphonate)s

Ryoyu Hifumi, Ikuyoshi Tomita

Polymer Journal 50 ( 6 ) 467 - 471 2018.6

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Publishing type：Research paper (scientific journal)

DOI： 10.1038/s41428-018-0032-z

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Through-space conjugated polymers consisting of planar chiral pseudo-ortho-linked [2.2]paracyclophane

Yasuhiro Morisaki, Ryoyu Hifumi, Lin Lin, Kenichi Inoshita, Yoshiki Chujo

Polymer Chemistry 3 ( 10 ) 2727 - 2730 2012.10

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Publishing type：Research paper (scientific journal)

DOI： 10.1039/c2py20530k

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Practical optical resolution of planar chiral pseudo-ortho-disubstituted [2.2]paracyclophane

Yasuhiro Morisaki, Ryoyu Hifumi, Lin Lin, Kenichi Inoshita, Yoshiki Chujo

Chemistry Letters 41 ( 9 ) 990 - 992 2012

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Publishing type：Research paper (scientific journal)

DOI： 10.1246/cl.2012.990

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Research Projects

低誘電・高接着を志向したホスフィンスルフィド材料の開発

Grant number：22K14722 2022.4 - 2027.3

日本学術振興会科学研究費助成事業若手研究

一二三遼祐

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Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

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