给-吸电子单元交替相连的高分子光伏材料聚对苯撑乙烯撑(PPV)共聚物一般具有较低的带隙,可以增加对太阳光的利用率.文中设计合成了两种含喹喔啉的具有给-吸电子单元相连特征的PPV共聚物PPV-QL、PPV-BPh.用核磁共振(NMR)、红外光谱(FT-IR)等对共聚物的结构进行了表征,并对其紫外-可见吸收及光学带隙进行了研究.结果显示,PPV-QL、PPV-BPh吸收峰反而比PPV蓝移,带隙也维持不变.通过计算机模拟,使用半经验的AM1对两种高分子几何构型进行了最优化,发现共聚物与PPV相比,共平面变差,这给共轭效应带来不利影响,抵消了给-吸电子结构对共轭效应的增加.
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