Development of new mechanofluorochromic materials based on borepin structure

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15543
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
• Research Institution: Hiroshima University
• Principal Investigator: Adachi Yohei 広島大学, 先進理工系科学研究科(工), 助教 (50805215)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: ホウ素 / ボレピン / 固体発光 / クロミズム / TADF

Outline of Final Research Achievements

Organic fluorescent molecules with property of changing emission properties in response to external stimuli (mechanofluorochromism, MFC) are expected to be applied to functional materials such as sensors. In this study, we attempted to synthesize new MFC materials based on a structure called benzo[d]dithieno[b,f]bolepin, which exhibits unique solid-state emission properties. By introducing various substituents on the boron, we succeeded to synthesize borepins that exhibit not only MFC but also thermally activated delayed fluorescence and phosphorescence.

Free Research Field

有機材料化学

Academic Significance and Societal Importance of the Research Achievements

MFC特性を有する分子は、センサー材料やイメージングデバイスなどへの応用が期待されている。しかし純粋な有機分子の場合、MFC特性を示す場合でも発光色の変化が小さいことが多い。本研究ではホウ素を含む分子を用いることで、ドラスティックな発光色の変化を示すMFC材料を得ることができた。今後、その機構をより詳細に解析することで、さらに優れた特性を示す革新的MFC材料の創出へつながると期待できる。