摘要
本文报道了一种性能独特的聚集诱导发光分子DTPE-TB,它由位于中间的一个Tröger碱和两端的两个四苯基乙烯(TPE)基团构成.当DTPE-TB分子固体受到机械力作用时,Tröger碱的A-型结构通过改变二面角发生形变承载外力,使分子内运动受限加重,固体荧光增强.而TPE基团受力很小,其排列方式基本不变,所以发光波长仅有微小移动.我们将这种特殊的力致发光变色效应命名为力致荧光增强.
We demonstrate a unique mechano-luminochromic(MLC)effect of an aggregation-induced emission(AIE)-active luminogen(AIEgen),DTPE-TB,which is characterized by the evidently changed emission intensity but unimpressively shifted emission colors of the molecular solid.This behavior is termed mechanofluoro enhancement(MFE),which is quite distinct from the commonly reported AIEgens with the MLC property.The MFE effect originates from the special design of the DTPE-TB molecule,in which the two tetraphenylethene(TPE)units play the role of AIE,and the Tröger’s base unit takes the part of a mechanical force supporter.Therefore,when the DTPE-TB molecular solid is subjected to mechanical forces,theΛ-shaped Tröger’s base unit releases external forces by changing its dihedral angle.Meanwhile,the TPE units nearly keep unchanged in the molecular arrangement.Accordingly,the DTPE-TB solid shows an evidently enhanced emission under pressure due to the aggravated restriction of intramolecular motions but a slightly shifted emission wavelength due to the tiny variations in molecular packing.
作者
倪珏宸
臧启光
张浩可
孙景志
唐本忠
Juechen Ni;Qiguang Zang;Haoke Zhang;Jing Zhi Sun;Ben Zhong Tang(MOE Key Laboratory of Macromolecules Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China;Center of Healthcare Materials,Shaoxing Institute,Zhejiang University,Shaoxing 312000,China;ZJU-Hangzhou Global Scientific and Technological Innovation Center,Hangzhou 311215,China;Shenzhen Institute of Aggregate Science and Technology,School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen 518172,China)
基金
financially supported by the National Natural Science Foundation of China(22021715 and 52150222)
the Department of Science&Technology of Zhejiang Province(major scientific and technological project:2020C03030)
the support from the Open Fund of Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates,South China University of Technology(2019B030301003)。
