2018 Fiscal Year Final Research Report

Development of Photoresponsive Molecular Assemblies

Planned Research

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Project Area	Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions
Project/Area Number	26107010
Research Category	Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Allocation Type	Single-year Grants
Review Section	Science and Engineering
Research Institution	Aoyama Gakuin University
Principal Investigator	Abe Jiro 青山学院大学, 理工学部, 教授 (70211703)
Co-Investigator(Kenkyū-buntansha)	小林洋一立命館大学, 生命科学部, 准教授 (10722796) 坂本章青山学院大学, 理工学部, 教授 (90262146)
Co-Investigator(Renkei-kenkyūsha)	MUTOH Katsuya 青山学院大学, 理工学部, 助教 (10760605)
Project Period (FY)	2014-07-10 – 2019-03-31
Keywords	フォトクロミズム / 非線形光応答 / ラジカル / 結合解離 / 光異性化
Outline of Final Research Achievements	The stepwise two-photon induced photochromism, which involves a short-lived transient species as an intermediate state, is one of the advanced photo-responsive compounds. The key feature of the stepwise two-photon induced photochromism is an effective electronic interaction between the photogenerated transient chromophores. In this project, we have developed the fast T-type biphotochromic molecules showing the stepwise two-photon absorption processes. While high power pulse lasers were necessary to induce conventional simultaneous and stepwise two-photon absorption processes, the stepwise two-photon absorption process with the fast-photochromic compound can be initiated by extremely weak continuous wave light. The following are our outstanding research results.
Free Research Field	化学
Academic Significance and Societal Importance of the Research Achievements	準安定状態を含む複数の状態間を光照射により可逆的に変換できるフォトクロミック分子は、材料科学や生命科学分野における光応答システムを構築するための重要な要素技術である。従来のフォトクロミック分子では、微弱光でも光反応が進行してしまうため、ノイズとして作用する背景光の影響を避けることが難しかった。本研究で開発した入力光強度に閾値を有する非線形光応答系や、照射光強度に応じて着色状態の色調が変化する複合光応答系の実現は、光強度に依存する光応答系分子の新規設計指針を与えるものであり、従来の「一光子吸収と一分子応答」を超える光応答システムの学術基盤として重要である。