Photo-mechanical effect of crystals based on aromatic diimide molecules

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05699
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Organic chemistry
• Research Institution: Kyushu University
• Principal Investigator: Goto Kenta 九州大学, 先導物質化学研究所, 助教 (30380538)
• Research Collaborator: Nakamura Toshikazu ; Asada Mizue ; Ideta Keiko ; Matsumoto Taisuke
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 光化学反応 / 光メカニカル効果 / パイ電子系化合物 / 結晶構造

Outline of Final Research Achievements

In continuous our study on photomechanical properties of naphthalene diimide molecules, we found that the crystal of the newly prepared molecule has a phase transition. Before and after the phase transition, the molecular arrangement was markedly changed from orthogonal p-p stacking to parallel p-p stacking. With subsequent structural phase transition of the crystal, its photomechanical response is also different. Though the photo-response is complicated by forming a couple of radical species, the relaxation of the radical anion support the explanation for the differences for mechanical response of the crystals before and after phase transition.

Free Research Field

物理有機化学

Academic Significance and Societal Importance of the Research Achievements

光エネルギーを与えることで機械的な仕事をする結晶・物質の開発を行なった. 結晶の構成要素は同じであっても, 結晶内での分子配列を変えることで, 光応答性を制御できることが明らかとなった. 光照射前後の化学種間の緩和過程は機械的応答を評価するのに重要な因子であることが分かり, 我々の機械応答に対する評価法が, 結晶の巨視的応答と分子レベルのシグナルとの結びつけを理解する助けになると考えられる.