1,1,2,2-四(5-三甲基硅-二噻吩并[2,3-b:3′,2′-d]噻吩-2-)乙烯的发光现象研究  

Study on fluorescence emission behavior of 1,1,2,2-tetrakis(5-(trimethylsilyl)dithieno[2,3-b:3′,2′-d]thiophen-2-yl)ethene

作　　者：王治华[1] 张宇龙 李春丽[2] 徐莉[1] 王华[2] WANG Zhihua;ZHANG Yulong;LI Chunli;XU Li;WANG Hua(College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China;Engineering Research Center for Nanomaterials,Henan University,Kaifeng 475004,Henan,China)

机构地区：[1]河南大学化学化工学院,河南开封475004 [2]河南大学纳米材料工程研究中心,河南开封475004

出　　处：《化学研究》2022年第5期407-413,共7页Chemical Research

基　　金：国家自然科学基金-河南省联合基金重点项目(U2004213);国家自然科学基金-河南省人民政府联合基金项目(U1604126)。

摘　　要：通过对典型AIE分子,即四噻吩乙烯(TTE)分子结构的拓展,本文研究了一种聚集诱导发光(AIE)分子,即1,1,2,2-四(5-三甲基硅-二噻吩并[2,3-b:3′,2′-d]噻吩-2-)乙烯(TFTE)在溶液态、AIE态与冻结态下的发光行为,考察了介质的极性、粘度与温度等条件下的分子发光现象。研究发现,TFTE分子在有机溶剂中发较弱的荧光,发光峰约在480 nm,而在THF-H_(2)O二元溶剂体系中表现出显著的AIE态的发光特性,聚集态发光峰位于569 nm。在甲醇-甘油的二元溶剂体系中,单分子发光红移至595 nm,体现出显著的分子内单键旋转受阻与强的溶剂化作用。在分子运动完全受限(冻结态)条件下,TFTE分子展现出独特的长波长单分子发光,发光峰位于565 nm,并与TFTE分子的AIE发光峰非常接近,说明了AIE态与冻结态下TFTE分子的构象是相近的。TFTE分子在薄膜态下的发光峰位位于607 nm,比AIE态发光红移了38 nm,说明了薄膜中TFTE分子间存在显著的轨道相互作用,而在AIE态下分子间的相互作用微弱。Based on the molecular structural extension of tetrathiophenyl ethane(TTE),a typical aggregation-induced emission(AIE)molecule,namely 1,1,2,2-tetrakis(5-(trimethylsilyl)dithieno[2,3-b:3',2'-d]thiophen-2-yl)ethene(TFTE)was studied on its fluorescence emission behavior in both molecular state and AIE state under different medium conditions,including polarity,viscosity and temperature,etc.TFTE gives a weak fluorescence emission peaked at 480 nm in common organic solvents,but shows typical AIE emission located at 569 nm in THF-H_(2)O binary solvent system.Different from the cases in organic solvents and AIE state,TFTE exhibits a long wavelength emission peaked at 595 nm in the methanol-glycerol mixture,which provides high medium viscosity to restrict the C-C bond rotation in the molecule.In the rigid state(77 K),TFTE provides a strong emission peaked at 565 nm,which is close to 569 nm in the AIE state.Such experimental fact means that the molecular conformation of TFTE molecule in the rigid state and AIE state is almost same,and the intermolecular interactions in AIE state are pretty weak.However,the strong intermolecular interactions were observed in film state,which gave a long wavelength emission peaked at 607 nm,and an obvious bathochromic shift of 38 nm,comparing with the case of AIE state.Such experimental fact implies that the intermolecular close packing and loose stacking in film sate and AIE state,respectively.

关 键 词：四并三噻吩基乙烯 分子运动受阻 聚集诱导发光 冻结态发光 薄膜发光 

分 类 号：O64[理学—物理化学]