Development of Cyclophane-based Supramolecular Mechanophores and the Applications for Polymeric Materials

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H02024
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 35020:Polymer materials-related
• Research Institution: Tokyo Institute of Technology (2020-2021); Hokkaido University (2018-2019)
• Principal Investigator: Sagara Yoshimitsu 東京工業大学, 物質理工学院, 准教授 (60767292)
• Co-Investigator(Kenkyū-buntansha): キム ユナ 北海道大学, 電子科学研究所, 准教授 (00648131)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: 超分子メカノフォア / シクロファン / 蛍光 / 機械的刺激応答性発光材料 / 電荷移動錯体

Outline of Final Research Achievements

Recently, mechanophores that change absorption and fluorescence properties responding to mechanical stimuli have been extensively studied. In this study, we developed a supramolecular mechanophore based on cyclophane. When cyclophane-based supramolecular mechanophores with one fluorophore and one quencher are introduced into polyurethane, the film obtained through solvent casting shows an orange fluorescence color derived from the charge-transfer complex between the fluorophore and quencher. When the film is stretched, the fluorophore and quencher are spatially separated and blue fluorescence from the fluorophore is observed. This ratiometric fluorescence color change is instantly reversible.

Free Research Field

光機能性超分子

Academic Significance and Societal Importance of the Research Achievements

我々がこれまでに報告してきたロタキサンをモチーフとした超分子だけでなく、単純な環状分子であるシクロファンを用いても超分子メカノフォアを構築できることが明らかになった。本成果により超分子メカノフォアの分子設計の自由さが改めて示されたと言え、分野の進展・深化が期待できる。また、これまでに報告されてきたメカノフォアの中で電荷移動錯体を積極活用したメカノフォアはほぼ存在せず、新規性が高いと言える。