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New strategy for narrowing energy gaps by aza-substitution to isolated LUMO

Research Project

Project/Area Number 21K19002
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 35:Polymers, organic materials, and related fields
Research InstitutionKyoto University

Principal Investigator

TANAKA Kazuo  京都大学, 地球環境学堂, 教授 (90435660)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords共役系分子 / 近赤外発光 / ホウ素錯体 / 共役系高分子 / 超原子価 / 発光 / 近赤外 / LUMO
Outline of Research at the Start

本研究では、狭エネルギーギャップ構造を実現するために、従来の基本戦略である「共役系拡張」を用いない新戦略の確立を目的とする。具体的には「孤立LUMO」を有する骨格炭素をアザ置換し、LUMOのエネルギー準位を選択的に引き下げることで狭エネルギーギャップ化する機構の確立を図る。目的の実現のため固体近赤外発光の実現とメカノクロミズム応用、意図的な孤立LUMOの創出と共役系基本骨格の近赤外発光化を行う。

Outline of Final Research Achievements

Substitution of electronegative nitrogen for carbon in the π-conjugated system (aza-substitution) can stabilize the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). In this project, we aim to show the selective lowering of isolated LUMO by aza-substitution for establishing a new strategy for narrowing the energy gap. In particular, molecules having an extended π-conjugated system are likely to lose solid-state luminescence, as is often the case with common organic luminescent dyes, due to concentration quenching caused by intermolecular interactions. In this research, we aimed to develop small near-infrared emitting dyes. By aza-substituting two sites on the benzene ring to selectively lower the LUMO, and by further complexing with boron, we were able to obtain near-infrared luminescence.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は「孤立LUMO」という我々が初めて見出した概念に立脚し、アザ置換で選択的LUMOの引き下げを達成し、偶然性に頼らない狭ギャップ化の新戦略の確立を目指す点にある。従来の「共役の拡張」における分子の巨大化に伴う問題の解決のみならず、相乗的にさらなる長波長化も期待できる。また、量子化学計算的手法でゼロから設計可能であり、AIを用いた効率的な物質探索手法にも適用可能である。以上、本研究は我々の最近の学術的な発見に基づくため萌芽的段階であるが、達成時には狭ギャップ化の新戦略から機能性近赤外発光材料開発につながり、学術的インパクトと産業的波及効果は大きいと考えられる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (22 results)

All 2023 2022 2021 Other

All Journal Article (12 results) (of which Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 7 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Near‐Infrared Emissive Hypervalent Compounds with Germanium(IV)‐Fused Azobenzene π‐Conjugated Systems2023

    • Author(s)
      Gon Masayuki、Yaegashi Misao、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Chemistry -A European Journal

      Volume: 29 Issue: 12

    • DOI

      10.1002/chem.202203423

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Position Dependent Effects of the Aza‐Substitution on the Electronic Properties and Crystal Structures Based on Hexaazaphenalene Isomers2022

    • Author(s)
      Watanabe Hiroyuki、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Asian Journal of Organic Chemistry

      Volume: 11 Issue: 9

    • DOI

      10.1002/ajoc.202200221

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of Regioregularity of <i>π</i> ‐Conjugated Polymers Composed of Boron <i>β</i> ‐Diketiminate on Their Stimuli‐Responsive Luminescence2022

    • Author(s)
      Ito Shunichiro、Fukuyama Misuzu、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Macromolecular Chemistry and Physics

      Volume: - Issue: 9 Pages: 2100504-2100504

    • DOI

      10.1002/macp.202100504

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of NIR emissive fully-fused bisboron complexes with π-conjugated systems including multiple azo groups2022

    • Author(s)
      Nakamura Masashi、Gon Masayuki、Natsuda Shin-ichiro、Tamai Yasunari、Ohkita Hideo、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Dalton Transactions

      Volume: 51 Issue: 1 Pages: 74-84

    • DOI

      10.1039/d1dt03652a

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Near-infrared-emissive π-conjugated polymers based on five-coordinated silicon formazanate complexes2022

    • Author(s)
      Ito Shunichiro、Ito Yoshinori、Kazuo Tanaka、Chujo Yoshiki
    • Journal Title

      Polymer

      Volume: 239 Pages: 124463-124463

    • DOI

      10.1016/j.polymer.2021.124463

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Switching between intramolecular charge transfer and excimer emissions in solids based on aryl-modified ethynyl?o-carboranes2022

    • Author(s)
      Yamamoto Hideki、Ochi Junki、Yuhara Kazuhiro、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Cell Reports Physical Science

      Volume: 3 Issue: 2 Pages: 100758-100758

    • DOI

      10.1016/j.xcrp.2022.100758

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Controlling the Dual‐Emission Character of Aryl‐Modified <i>o</i> ‐Carboranes by Intramolecular CH???O Interaction Sites2022

    • Author(s)
      Ochi Junki、Yuhara Kazuhiro、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Chemistry ? A European Journal

      Volume: - Issue: 20

    • DOI

      10.1002/chem.202200155

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of Long Wavelength Light-Absorptive Homopolymers Based on Pentaazaphenalene by Regioselective Oxidative Polymerization2021

    • Author(s)
      Watanabe Hiroyuki、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Polymers

      Volume: 13 Issue: 22 Pages: 4021-4021

    • DOI

      10.3390/polym13224021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Synthesis, crystal structure, solid-state optical property and C?H activation of sp3 carbon of highly-stable 1-(2′,6′-dimesitylphenyl)-2,3,4,5-tetraphenylborole2021

    • Author(s)
      Himeno Ryoji、Ito Shunichiro、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      New Journal of Chemistry

      Volume: 45 Issue: 48 Pages: 22569-22573

    • DOI

      10.1039/d1nj04666g

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rational design for thermochromic luminescence in amorphous polystyrene films with bis‐ o ‐carborane‐substituted enhanced conjugated molecule having aggregation‐induced luminochromism2021

    • Author(s)
      Wada Keisuke、Hashimoto Kazushi、Ochi Junki、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Aggregate

      Volume: 2 Issue: 5

    • DOI

      10.1002/agt2.93

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dimerization-Induced Solid-State Excimer Emission Showing Consecutive Thermochromic Luminescence Based on Acridine-Modified <i>o</i>-Carboranes2021

    • Author(s)
      Ochi Junki、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Inorganic Chemistry

      Volume: 60 Issue: 12 Pages: 8990-8997

    • DOI

      10.1021/acs.inorgchem.1c00901

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] The Effect of the Substituent Positions on Self-Assembly Behaviors of Liquid-Crystalline 1,3,4,6,9b-Pentaazaphenalene Derivatives2021

    • Author(s)
      Watanabe Hiroyuki、Tanaka Kazuo、Chujo Yoshiki
    • Journal Title

      Bulletin of the Chemical Society of Japan

      Volume: 94 Issue: 7 Pages: 1854-1858

    • DOI

      10.1246/bcsj.20210150

    • NAID

      130008076890

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Development of Chemical Sensors for Plastic Materials2022

    • Author(s)
      Kazuo Tanaka
    • Organizer
      PPC17
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A New Strategy for Developing NIR-AIEgens Based on Aza-Substitution at the Isolated LUMO Position2022

    • Author(s)
      Kazuo Tanaka
    • Organizer
      IC-AIE-FA 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] New strategy for designing NIR-luminescent materials without expansion of π-conjugated system2022

    • Author(s)
      Kazuo Tanaka
    • Organizer
      Japan-US Workshop on Organic/Inorganic Hybrid Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Design of Stimuli-Responsive Luminescent Materials Containing Flexible Boron “Element-Blocks”2021

    • Author(s)
      Kazuo Tanaka
    • Organizer
      PACIFICHEM2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of film-type sensors based on stimuli-responsive conjugated polymers containing element-blocks2021

    • Author(s)
      Kazuo Tanaka
    • Organizer
      PACIFICHEM2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Design for solid-state NIR-emissive materials based on aza-substituted AIEgens2021

    • Author(s)
      Kazuo Tanaka
    • Organizer
      International Conference on Aggregate Science 20th Anniversary of AIE Research
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of stimuli-responsive luminescent polymers based on a flexible “element-block”2021

    • Author(s)
      Kazuo Tanaka
    • Organizer
      ACS spring meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 研究内容

    • URL

      https://poly.synchem.kyoto-u.ac.jp/research/

    • Related Report
      2022 Annual Research Report
  • [Remarks] 発表論文リスト

    • URL

      https://poly.synchem.kyoto-u.ac.jp/publications/

    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 化合物2021

    • Inventor(s)
      田中一生;中條善樹;権正行;秋山誠治、他3名
    • Industrial Property Rights Holder
      田中一生;中條善樹;権正行;秋山誠治、他3名
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-030493
    • Filing Date
      2021
    • Related Report
      2021 Research-status Report

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Published: 2021-07-13   Modified: 2024-01-30  

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