基于1,4-二噻吩二酮-2,5-(5-溴)二噻吩基苯有机聚合物的合成及其基本性质

Synthesis and Properties of Organic Polymers Based on 1,4-Bis(thiophen-3-ylmethanone)-2,5-bis(5-bromothiophen)benzene

以噻吩和2,5-二溴对苯二甲酸为基础原料,经5步反应高收率合成了1,4-二噻吩二酮-2,5-(5-溴)二噻吩基苯衍生物,再与有机锡化合物共聚制备了三种有机共轭聚合物材料,初步研究了其分子量、紫外吸收、电化学性质以及热稳定性等性能。结果表明:3种聚合物数均分子量都在11.9 kg/mol以上;最大紫外吸收均在454 nm以上;聚合物6a,6b,6c的光学带隙分别为2.41 eV、2.35 eV、2.31 eV;热分解温度(5%)都在343℃以上,是一类具有良好热力学稳定性的聚噻吩衍生物高分子材料。

The central core,1,4-bis(thiophen-3-ylmethanone)-2,5-bis(5-bromothiophen)benzene was synthesized by thiophene and 2,5-dibromoterephthalic acid as intial materials after a 5-step reaction with high yields.Three conjugated polymers were obtained by Stille coupling,using the central core and organotin compounds,respectively.Their molecular weights,UV-Vis absorption,electrochemical property and thermal stability were investigated.The results showed that the number average molecular weight(Mn)of polymers 6a,6b and 6c were over 11.9 kg/mol,the maximum UV-Vis absorption were over 454 nm,the optical bandgap were 2.41 eV,2.35 eV and 2.31 eV,respectively.And the 5%weight loss temperature of polymers were over 343℃,which shows that the polythiophene derivatives have good thermodynamic stability.