Photoswitching Materials Comprising Designed Ionic Species

2018 Fiscal Year Final Research Report

• Project Area: Application of Cooperative-Excitation into Innovative Molecular Systems with High-Order Photo-functions
• Project/Area Number: 26107007
• 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: Ritsumeikan University
• Principal Investigator: Maeda Hiromitsu 立命館大学, 生命科学部, 教授 (80388115)
• Co-Investigator(Kenkyū-buntansha): 山門 陵平 山形大学, 大学院有機材料システム研究科, 助教 (90735549)
• Research Collaborator: HAKETA Yohei
• Project Period (FY): 2014-07-10 – 2019-03-31
• Keywords: π電子系 / イオン会合 / 分子集合化 / 光応答性

Outline of Final Research Achievements

An advantage of ion-pairing materials is the introduction of different functionalities to oppositely charged species, and introducing various substituents is crucial for controlling the states and assembling modes of the ion pairs and their resulting properties. One of the strategies to control the states of ion pairs is to introduce stimuli-responsive moieties whose geometries can be modulated by applying an external stimulus. Therefore, we have designed and synthesized photoresponsive π-electronic ions, which can provide ion-pairing assemblies exhibiting photo-driven changes in assembled structures and electronic properties. In fact, the ion-pairing assemblies comprising photoresponsive anions were fabricated, exhibiting photo-driven reversible switching behaviors with crystal-crystal phase transitions and changes in assembling modes.

Free Research Field

有機化学・超分子化学

Academic Significance and Societal Importance of the Research Achievements

π電子系イオンから構成される集合体の構成ユニットに光応答性を付与することにより、複数の集合化形態間の相互変換を実現する分子システムを提案できたことは、合成化学・材料科学の観点から学術的に高い意義を有する。デバイスを指向した展開が可能であることも示唆されたことから、応用・実用化も見据えた点で社会的意義が示された。