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Study for the spin conversion mechanism in the multiexciton generated by the singlet fission

Research Project

Project/Area Number 19K15506
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionSaitama University

Principal Investigator

Nagashima Hiroki  埼玉大学, 理工学研究科, 助教 (60814027)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords電子スピン共鳴 / 一重項分裂 / 三重項 / 五重項 / スピン化学 / 光化学 / シングレットフィッション / 三重項ー三重項消滅 / パルス電子スピン共鳴 / 一重項分裂(singlet fission) / 電子スピン共鳴(EPR/ESR) / スピン変換
Outline of Research at the Start

一重項分裂(Singlet Fission, SF)は一つの一重項励起子から2個の三重項励起子を生成するユニ ークな反応である。SFは 光デバイス効率を飛躍的に向上させる潜在性を秘めた多重量子現象である。SFはスピン許容 遷移であり、一重項状態にある励起子ペア1(TT)を形成する。近年、その直後のスピン変換により五重項状態5(TT)が形成されることが発見された。本研究では、SF機構の理解と効率的な SF材料の創出に不可欠な、スピン変換機構の解明を目指す。そのために、時間分解、パルス電子スピン共鳴法による五重項状態の直接検出、構造解析と量子化学計算とを組み合わせ、多重励起子の 生成に関わる中間状態の構造などの反応機構の解明に取り組む。

Outline of Final Research Achievements

Singlet fission is a unique reaction which produces two triplet excitons from one singlet exciton. In this study, we measured time-resolved electron spin resonance to understand the spin conversion mechanism in the correlated triplet-triplet pair which is important to develop efficient singlet fission materials in future. The time-resolved electron spin resonance spectra of the singlet-fission-born quintet state revealed that geometric structures of the pair of singlet fission materials are related with the spin conversion. The study revealed that the structural flexibility of the singlet fission materials are important for spin conversion.

Academic Significance and Societal Importance of the Research Achievements

太陽電池は, 現代のエネルギー問題を解決しうる切り札として知られる。太陽電池の効率にはショックリークワイサーリミットとして知られる, 理論上の限界が存在するために, その性能向上や実用面には大きな制限がかかっていた。シングレットフィッションはそのような一つの光子から二つの三重項を生み出す, 太陽電池の限界を超えられる反応である。本研究では一重項分裂で生じた三重項のダイナミクスを観測し, 構造と関連づけ, 分子の柔軟性が逆反応を防ぐスピン変換を引き起こすことを明らかにした。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 8 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Northwestern University(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Northwestern University(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Northwestern University(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Synergetic Role of Conformational Flexibility and Electronic Coupling for Quantitative Intramolecular Singlet Fission2021

    • Author(s)
      Nakamura Shunta、Sakai Hayato、Nagashima Hiroki、Fuki Masaaki、Onishi Kakeru、Khan Ramsha、Kobori Yasuhiro、Tkachenko Nikolai V.、Hasobe Taku
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 125 Issue: 33 Pages: 18287-18296

    • DOI

      10.1021/acs.jpcc.1c04734

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin Dynamics of Quintet and Triplet States Resulting from Singlet Fission in Oriented Terrylenediimide and Quaterrylenediimide Films2020

    • Author(s)
      Bae Youn Jue、Zhao Xingang、Kryzaniak Matthew D.、Nagashima Hiroki、Strzalka Joseph、Zhang Qingteng、Wasielewski Michael R.
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 124 Issue: 18 Pages: 9822-9833

    • DOI

      10.1021/acs.jpcc.0c03189

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ultra‐Narrow Depletion Layers in a Hematite Mesocrystal‐Based Photoanode for Boosting Multihole Water Oxidation2020

    • Author(s)
      Zhang Zhujun、Nagashima Hiroki、Tachikawa Takashi
    • Journal Title

      Angewandte Chemie International Edition

      Volume: 59 Issue: 23 Pages: 9047-9054

    • DOI

      10.1002/anie.202001919

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ultra‐Narrow Depletion Layers in a Hematite Mesocrystal‐Based Photoanode for Boosting Multihole Water Oxidation2020

    • Author(s)
      Zhang Zhujun、Nagashima Hiroki、Tachikawa Takashi
    • Journal Title

      Angewandte Chemie

      Volume: 132 Issue: 23 Pages: 9132-9139

    • DOI

      10.1002/ange.202001919

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Orientation of Ligand Field for Dangling Manganese in Photosynthetic Oxygen-Evolving Complex of Photosystem II2019

    • Author(s)
      Mino Hiroyuki、Nagashima Hiroki
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 124 Issue: 1 Pages: 128-133

    • DOI

      10.1021/acs.jpcb.9b10817

    • NAID

      120006777535

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Exergonic Intramolecular Singlet Fission of an Adamantane-Linked Tetracene Dyad via Twin Quintet Multiexcitons2019

    • Author(s)
      Matsui Yasunori、Kawaoka Shuhei、Nagashima Hiroki、Nakagawa Tatsuo、Okamura Naoki、Ogaki Takuya、Ohta Eisuke、Akimoto Seiji、Sato-Tomita Ayana、Yagi Shigeyuki、Kobori Yasuhiro、Ikeda Hiroshi
    • Journal Title

      The Journal of Physical Chemistry C

      Volume: 123 Issue: 31 Pages: 18813-18823

    • DOI

      10.1021/acs.jpcc.9b04503

    • NAID

      120007002585

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Controlled Orientations of Neighboring Tetracene Units by Mixed Self-Assembled Monolayers on Gold Nanoclusters for High-Yield and Long-Lived Triplet Excited States through Singlet Fission2019

    • Author(s)
      T. Saegusa, H. Sakai, H. Nagashima, S. Nakamura, Y. Kobori, N. V. Tkachenko, T. Hasobe
    • Journal Title

      J. Am. Chem. Soc.

      Volume: 141 Issue: 37 Pages: 14720-14727

    • DOI

      10.1021/jacs.9b06567

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Interfacial oxygen vacancies yielding long-lived holes in hematite mesocrystal-based photoanodes2019

    • Author(s)
      Zhang Zhujun、Karimata Izuru、Nagashima Hiroki、Muto Shunsuke、Ohara Koji、Sugimoto Kunihisa、Tachikawa Takashi
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1 Pages: 4832-4832

    • DOI

      10.1038/s41467-019-12581-z

    • NAID

      120006764480

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] SCRP measurement of AQDS-BSA bound system2020

    • Author(s)
      Shuhei Arai, Hiroki Nagashima, Lewis M Antill, and Kiminori Maeda
    • Organizer
      Kanto Area Spin Chemistry Meeting
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] AWGを用いたラジカル対の反応異 方性制御2020

    • Author(s)
      増澤健太, 立野明宏, 長嶋宏樹, 菅原道彦, 前田公憲
    • Organizer
      電子スピンサイエンス学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 植物PSIIの電荷再結合に対する活 性化パラメータの再評価2020

    • Author(s)
      尾崎恭佑, 長嶋宏樹, 三野広幸, 立川貴士, 小堀康博
    • Organizer
      電子スピンサイエンス学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Pratical modern spin dynamics simulation using MATLAB2020

    • Author(s)
      Hiroki Nagashima
    • Organizer
      Kanto Aria Spin Chemistry meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] Light-induced DEER measurement on the AQDS-binding site in the Bovine Serum Albumin.2020

    • Author(s)
      Hiroki Nagashima, Lewis M. Antill and Kiminori Maeda
    • Organizer
      生物物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] The quintet state generation process via inter- and intra-molecular singlet fission2019

    • Author(s)
      Hiroki Nagashima, Yasunori Matsui, Shuhei Kawaoka, Seiji Akimoto, Takashi Tachikawa, Hiroshi Ikeda, Yasuhiro Kobori,
    • Organizer
      The Rocky Mountain Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Structural analysis of the water oxidation center using electron spin resonance and membrane-oriented photosystem II2019

    • Author(s)
      Hiroki Nagashima and Hiroyuki Mino
    • Organizer
      QST Symposium
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 偏光励起による五重項状態の効率的形成に関する研究2019

    • Author(s)
      Hiroki Nagashima Yausnori Matsui, Shuhei Kawaoka, Seiji Akimoto, Takashi Tachikawa, Hiroshi Ikeda and Yasuhiro Kobori
    • Organizer
      電子スピンサイエンス学会年会
    • Related Report
      2019 Research-status Report
  • [Remarks] 太陽光、水、赤錆から水素ガスを高効率に製造 ―光触媒開発に新たなブレイクスルー―

    • URL

      https://www.kobe-u.ac.jp/research_at_kobe/NEWS/news/2020_05_01_01.html

    • Related Report
      2019 Research-status Report
  • [Remarks] 赤錆を用いて水と太陽光から水素を製造 ―太陽光水素製造システムの実用化に新たな一歩―

    • URL

      https://www.kobe-u.ac.jp/research_at_kobe/NEWS/news/2019_10_23_01.html

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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