固液双态高效发光的液晶分子的合成、相结构及光物理性质  

Synthesis,Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State

作　　者：郑军峰 程晓帆 葛云翀 宫佳鑫 徐鹏 ZHENG Junfeng;CHENG Xiaofan;GE Yunchong;GONG Jiaxin;XU Peng(Department of Applied Chemistry,College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学化学工程学院应用化学系,江苏南京210037

出　　处：《发光学报》2023年第5期863-872,共10页Chinese Journal of Luminescence

摘　　要：常见的有机发光分子主要有聚集导致猝灭(ACQ)分子和聚集诱导发光(AIE)分子。前者仅在单分子态(如稀溶液)高效发光,而后者仅在聚集态(如固态)高效发光。本工作中,我们合成了一种在稀溶液和聚集态均能高效发光的液晶分子(MS-12),并表征了其液晶性质和光物理性质。MS-12的两端为树枝单元,中间为长棒状的刚性核,可看作典型的Phasmid型液晶基元;刚性核由氰基二苯乙烯(AIE单元)和苯炔苯(ACQ单元)单元构成;由于氰基的强吸电子效应,MS-12具有D-A-π-A-D的结构特征。MS-12在固态形成六方柱状液晶相,单分子层厚度(~0.44 nm)的单胞内含有~4个分子;其在稀溶液态高效发光,在四氢呋喃中荧光量子产率(QY)~78.1%,在固态表现出AIE分子的性质,在本体液晶态的QY~59.6%。本研究为多态发光分子的设计,尤其是多态发光液晶分子的设计提供了有效的方案。Organic luminogens can be divided roughly into two main classes:aggregation-caused quenching(ACQ)and aggregation-induced emission(AIE)molecules,which are highly emissive only in single molecular and aggregated state,respectively.In this work,we synthesized a liquid crystalline molecule(MS-12)with high emis-sion efficiency both in solution and solid state and studied its liquid crystalline and photophysical properties.MS-12 consists of a long rod-like core ended by two Percec-type dendrons.The rigid core is composed of cyanostilbene and diphenylacetylene units,featuring a D-A-π-A-D emitter.It renders a hexagonal columnar liquid crystalline phase in bulk state,with four molecules in each monomolecular-thick(~0.44 nm)hexagonal unit cell.In dilute solution,it behaves like a ACQ molecule with a quantum yield(QY)up to 78.1%in THF.It shows a strong AIE character in condensed state,with a QY of 59.6%in bulk liquid crystalline state.This work provides a general strategy to multi-state emissive organic luminogens,those in particular with liquid crystalline properties.

关 键 词：聚集诱导发光(AIE) 聚集导致荧光淬灭(ACQ) 多态发光 液晶 

分 类 号：O753.2[理学—晶体学]