含六苯基苯结构单元桨型分子的合成及光致发光特性

以1,3,5-三苯基苯为中心核, 4-乙烯基联苯为桥联结构, 通过Heck偶联反应合成了含六苯基苯结构单元的桨型分子, 对其结构进行了表征; 对桨型分子及其结构单元包括4-乙烯基联苯、含六苯基苯结构的“臂”及其母体结构1,3,5-三(4-苯乙烯基苯基)苯]在溶液中的光致发光特性的研究结果表明, 桨型分子具有2个发光中心, 最大发射波长在蓝色光范围内分别为397和445 nm.

Synthesis and Photoluminescent Properties of Propeller-shaped Polyphenylenes Containing Hexaphenylbenzene Units

A novel propeller-shaped polyphenylene(9),based on hexaphenylbenzene-graphite subunits and a core molecule,1,3,5-tris(4-styrylphenyl)benzene(8),was synthesized by Heck coupling reaction of 4-(4-vinylphenylene) hexaphenylbenzene(7) with 1,3,5-tris(4-iodophenylbenzene)(4).The structure of molecule 9 was characterized by FTIR,1H NMR,13C NMR,GPC,MALDI-TOF mass spectrum,and elemental analysis.The absorption and photoluminescence spectra of propeller-shaped molecule 9 were investigated.Compared with structurally related chromophoric units including 4-vinylbiphenyl,1-4-(4-vinylphenyl)phenyl-2,3,4,5,6-pentaphenylbenzene 7 and 1,3,5-tris(4-styrylphenyl)benzene 8,the absorption peak of molecule 9 was red-shifted to 355 nm.This molecule exhibited two maximum emitting peaks at 397 nm and 445 nm in the range of blue luminescence with photoluminescence efficiency being 19%.