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Improvement of the accuracy of transient circular dichroism measurements for the detection of the chirality of transient molecules

Research Project

Project/Area Number 20H02806
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 35030:Organic functional materials-related
Research InstitutionTohoku University

Principal Investigator

ARAKI YASUYUKI  東北大学, 多元物質科学研究所, 准教授 (80361179)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Keywords円二色性 / キラリティ / 電子励起状態 / 過渡吸収 / 励起三重項状態 / 光励起状態
Outline of Research at the Start

光励起状態における円二色スペクトルは実測例が極めて少なく、観測すること,そしてその解釈を行うことは学術的な観点から重要であると考えられる。さらに,スペクトル解析から得られる光励起状態のキラリティの知見は円偏光を直接発する EL 素子開発へ応用展開できると期待できる。 本申請では,これまで申請者が開発してきた手法の問題点を克服する過渡円二色測定手法を新たに考案する。本申請により,過渡円二色スペクトル測定がより容易な研究手法となり,広く科学者に利用されるツールとなることによって,将来的に過渡的なキラリティをキーワードとした学際的な研究を加速するトリガとなることが期待できる。

Outline of Final Research Achievements

Since there are very few examples of circular dichroism spectra in the photo-excited state, it is important to observe and interpret them from an academic point of view. In addition, the development of EL devices that directly emit circularly polarized light is expected to benefit from the knowledge of the chirality of the photo-excited state obtained from the spectral analysis.The authors have developed a transient circular dichroism measurement method. We have succeeded in measuring the transient circular dichroism spectra of helicene in the photo-excited triplet state.We believe that by establishing a simpler and more accurate method for measuring transient circular dichroism spectra, this method will contribute to the development of science.
Therefore, in this study, we have improved the measurement apparatus we have developed so far and performed transient circular dichroism measurements with it.

Academic Significance and Societal Importance of the Research Achievements

円二色性スペクトルは、タンパク質や核酸などの生体分子のような光学活性な化合物の構造を簡便に理解するために有用です。しかしながら、これらのスペクトルから得られる構造情報は基本的に静的なものであり、溶液中でダイナミックに構造を変える生体分子の挙動を追うことはごく限られた研究でしか行えていませんでした。本研究ではそれを踏まえ、円二色性測定法を改良したとえばスナップショットを取るように動的に動く分子の円二色スペクトル測定を行う手法を開発することを目的とし、その基礎的な測定手法の確立と改良を行いました。この測定手法は、将来生体分子と薬剤との相互作用等の理解のために有用であると考えられます。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (14 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

  • [Journal Article] Random laser oscillation from an organic fluorescent dye loaded inside a porous zirconia medium2021

    • Author(s)
      Sakurayama Yukari、Onodera Tsunenobu、Araki Yasuyuki、Wada Takehiko、Oikawa Hidetoshi
    • Journal Title

      RSC Advances

      Volume: 11 Issue: 51 Pages: 32030-32037

    • DOI

      10.1039/d1ra05791j

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Near perfect head-to-head selectivity on the supramolecular photocyclodimerisation of 2-anthracenecarboxylate with self-organised gemini surfactant bilayers2020

    • Author(s)
      Yospanya Wijak、Nishijima Masaki、Araki Yasuyuki、Buffeteau Thierry、Pouget Emilie、Wada Takehiko、Oda Reiko
    • Journal Title

      Chemical Communications

      Volume: 56 Issue: 69 Pages: 10058-10061

    • DOI

      10.1039/d0cc04198j

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Efficient Light‐Harvesting Antennae Resulting from the Dense Organization of Dyes into DNA Junctions though d ‐Threoninol2020

    • Author(s)
      Kashida Hiromu、Azuma Hidenori、Maruyama Ryoko、Araki Yasuyuki、Wada Takehiko、Asanuma Hiroyuki
    • Journal Title

      Angewandte Chemie International Edition

      Volume: - Issue: 28 Pages: 11360-11363

    • DOI

      10.1002/anie.202004221

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Solvent Effects and Aggregation Phenomena Studied by Vibrational Optical Activity and Molecular Dynamics: The Case of Pantolactone2020

    • Author(s)
      Ghidinelli Simone、Abbate Sergio、Koshoubu Jun、Araki Yasuyuki、Wada Takehiko、Longhi Giovanna
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 124 Issue: 22 Pages: 4512-4526

    • DOI

      10.1021/acs.jpcb.0c01483

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] キラルなピレン二量体の合成と円二色性および円偏光発光特性の検討2022

    • Author(s)
      荒木保幸, Pandey Sadikshya, 柿崎知則, 西嶋政樹, 酒井隼人, 羽曾部 卓, Pranee Piyanan, 小田玲子, 和田健彦
    • Organizer
      2022年光化学討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] CPL from the Photo-excited Chiral Dimer States2022

    • Author(s)
      Yasuyuki Araki, Sadikshya Pandey, Walance Wu, Masaki Nishijima, Takehiko Wada, Taku Hasobe
    • Organizer
      28th PhotoIUPAC
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Emission characteristics of new chiral pyrene dimer2022

    • Author(s)
      Sadikshya Pandey, Tomonori Kakizaki, Masaki Nishijima, Yasuyuki Araki, Hayato Sakai, Taku Hasobe
    • Organizer
      28th PhotoIUPAC
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design and synthesis of chiral pyrene dimers for enhanced circularly polarized luminescence2022

    • Author(s)
      Sadikshya Pandey, Tomonori Kakizaki, Masaki Nishijima, Yasuyuki Araki, Hayato Sakai, Taku Hasobe, Piyanan Pranee, Reiko Oda, Takehiko Wada
    • Organizer
      日本化学会 第102会春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Synthesis, characterization and studies on emission properties of chiral pyrene dimers2022

    • Author(s)
      Sadikshya Pandey, Tomonori Kakizaki, Masaki Nishijima, Yasuyuki Araki, Hayato Sakai, Taku Hasobe, Piyanan Prance, Reiko Oda, Takehiko Wada
    • Organizer
      International CREST-CPL Conference in Awaji
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Circulaly Polarized Luminescence (CPL) from the Photo-excited DImer2022

    • Author(s)
      Yasuyuki Araki
    • Organizer
      International CREST-CPL Conference in Awaji
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Absorption Fluorescence and Circular Dichroism Spectra of Chiral NDI Dimers2021

    • Author(s)
      Wu Walance Stewart, 佐藤 岳仁, 西嶋 政樹, 荒木 保幸, Reiko Oda, 和田 健彦
    • Organizer
      化学系学協会東北大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Synthesis and spectroscopic study of chiral pyrene-based cyclophane2021

    • Author(s)
      Sadikshya PANDEY, Tomonori KAKIZAKI, Masaki NISHIJIMA, Yasuyuki ARAKI, Reiko ODA, Takehiko WADA
    • Organizer
      2021年光化学討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Development of CPL-emitting molecules based on the understanding of efficient CPL eimssion from photoexcited dimers2021

    • Author(s)
      Yasuyuki Araki
    • Organizer
      日本化学会第101春季年会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] CPL emission from the photo-excited parallel-oriented aryl/aryl dimers2020

    • Author(s)
      Yasuyuki Araki
    • Organizer
      The 5th International Symposium of Quantum Beam Science at Ibaraki University
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2024-01-30  

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