Stiff-stilbene derivatives as new bright fluorophores with aggregation-induced emission  

作　　者：Ya-Hang Wu Kun Huang Shu-Feng Chen Yu-Zhe Chen Chen-Ho Tung Li-Zhu Wu 

机构地区：[1]Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China [2]University of the Chinese Academy of Sciences, Beijing 100049, China [3]College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China

出　　处：《Science China Chemistry》2019年第9期1194-1197,共4页中国科学（化学英文版）

基　　金：supported by the Ministry of Science and Technology of China(2017YFA0206903);the National Natural Science Foundation of China(21871280,21861132004);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB17000000);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDY-SSW-JSC029);K.C.Wong Education Foundation

摘　　要：Stiff-stilbene derivatives have been widely explored as molecular rotors, molecular force probes and optical switches with excellent performance. However, their function as fluorophores is poorly understood. In the present work, we design three stiffstilbene derivatives and study their photophysical properties. These compounds exhibit very weak emission in solution but significantly enhanced monomer emission in viscous solvent, bright excimer emission in aggregates and at solid state. Detailed spectroscopic studies, single crystal structural analysis, powder X-ray diffraction(XRD) as well as effects of substituents have been carefully examined. They provide direct evidence that intermolecular interactions and molecular packing, which can restrict bond vibration and rotation, are responsible for the bright aggregation-induced emission.Stiff-stilbene derivatives have been widely explored as molecular rotors, molecular force probes and optical switches with excellent performance. However, their function as fluorophores is poorly understood. In the present work, we design three stiffstilbene derivatives and study their photophysical properties. These compounds exhibit very weak emission in solution but significantly enhanced monomer emission in viscous solvent, bright excimer emission in aggregates and at solid state. Detailed spectroscopic studies, single crystal structural analysis, powder X-ray diffraction(XRD) as well as effects of substituents have been carefully examined. They provide direct evidence that intermolecular interactions and molecular packing, which can restrict bond vibration and rotation, are responsible for the bright aggregation-induced emission.

关 键 词：stiff-stilbene derivatives INTERMOLECULAR interactions molecular packing aggregation-induced emission 

分 类 号：O6[理学—化学]