Development of stimulus-responsive optically active quaternary silanes: Investigation of circularly polarized phosphorescence properties and application to thin film materials

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K05627
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35030:Organic functional materials-related
• Research Institution: The University of Tokyo
• Principal Investigator: Yamanoi Yoshinori 東京大学, 大学院理学系研究科(理学部), 准教授 (20342636)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: ジシラン結合 / 外部刺激応答性 / 円偏光発光

Outline of Final Research Achievements

Most of the research reports on circularly polarized light-emitting compounds have so far been made in aggregated states such as atropisomers and π-conjugated polymers, and examples showing good results in the monomolecular state are not well known. On the other hand, many organosilicon compounds having π-conjugated substituents exhibit good light-emitting properties. If a π-conjugated substituent is attached to an asymmetric silicon atom, a chiral conjugated system can be constructed via the asymmetric silicon atom. I can expect it. In this application, we synthesized an optically active silicon compound that has both good fluorescence quantum yield and circularly polarized luminescence properties in a monomolecular state, based on a new method for constructing asymmetric silicon atoms.

Free Research Field

有機化学

Academic Significance and Societal Importance of the Research Achievements

(1) ランタノイド錯体やアトロプ異性体は多工程合成経路であるのに対し、本研究における合成方法は単工程反応である。 (2) 反応で使用する基質が容易に入手できる。本研究における触媒的不斉カップリング反応では配位子の不斉源が安価な酒石酸由来であり、どちらの光学活性体も入手可能であるので、(R)体、(S)体両方の不斉ケイ素原子を構築できる。 (3)従来の円偏光発光材料では高蛍光量子収率、もしくは高円偏光発光特性のどちらかしか満たすことができなかった。本研究における化合物群は他グループの研究と比較し蛍光量子収率、円偏光発光特性のどちらも高い値を示すと期待できる。