Alkyl-Substituted Thieno[3,2-<i>b</i>]thiophene Polymers and Their Dimeric Subunits
作者:Xinnan Zhang、Markus Köhler、Adam J. Matzger
DOI:10.1021/ma049107n
日期:2004.8.1
series of alkyl-substituted polythieno[3,2-b]thiophenes were synthesized by cross-coupling and oxidative coupling reactions. Their electronic properties were studied by UV−vis absorption and fluorescence spectroscopies. The poly(3-nonylthieno[3,2-b]thiophene) prepared via Stille coupling of a differentially functionalized monomer displayed a longer λmax of absorption and a corresponding lower optical
通过交叉偶联和氧化偶联反应合成了一系列烷基取代的聚噻吩并[3,2- b ]噻吩。通过紫外可见吸收和荧光光谱研究了它们的电子性质。与通过FeCl 3制备的区域无规聚合物相比,通过差速官能化单体的斯蒂勒偶联制备的聚(3-壬基噻吩并[3,2- b ]噻吩)表现出更长的吸收λmax和相应的更低的光学带隙。方法或通过熊田耦合。使用二烷基取代的单体生产聚(3,6-二壬基噻吩并[3,2- b[噻吩]导致吸收光谱和发射光谱都急剧转移到较短的波长。通过循环伏安法研究了这些聚合物的电化学,发现与二烷基取代的聚合物相比,单烷基取代的聚合物具有相对较低的氧化电位。为了研究聚合物主链中单体的构象,制备了这些聚合物的二聚亚基。紫外可见光谱和计算都表明,头对尾的连接引起相邻环单元的小畸变,而头对头的连接导致共轭的减小。