A new route to oligothiophene–PEO-block-co-polymers has been developed, in which well-defined α-oligothiophene blocks (from bithiophene to sexithiophene) alternate with poly(ethylene oxide) blocks. These materials show high solubility in common organic solvents. UV/visible and fluorescence studies in solution indicate that the oligothiophene segments are molecularly dissolved in good solvents like chloroform. Aggregation of the oligothiophenes occurs in dioxane–water mixtures, which is manifest by shifts of the UV/visible absorption maxima towards the blue and quenching of the fluorescence. An oligothiophene length of three thiophenes (terthiophene) is necessary to observe this aggregation phenomenon.
一种新的合成途径已经被开发用来制备寡聚
噻吩-聚
环氧乙烷嵌段共聚物,其中定义良好的α-寡聚
噻吩嵌段(从二
噻吩到六
噻吩)与聚(
环氧乙烷)嵌段交替排列。这些材料在常见的有机溶剂中表现出高溶解性。紫外/可见和荧光研究表明,在良溶剂如
氯仿中,寡聚
噻吩片段分子级溶解。在
二氧六环-
水混合物中会发生寡聚
噻吩的聚集,表现为紫外/可见吸收峰向蓝移以及荧光的猝灭。观测这种聚集现象需要寡聚
噻吩的长度达到三个
噻吩(即三
噻吩)。