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通过单体4-[(2,5-二溴苯)乙炔基]苯胺和1,4-二乙炔基-2,5-二戊氧基苯之间的Sonogashira偶合反应合成了带有p-氨基苯乙炔基共轭侧基的聚对苯撑乙炔(PAnPE).该共轭聚合物的THF溶液(2×10-5mol·L-1)在473和519nm处呈现两个比较强的荧光发射峰.通过调节在聚合物PAnPE-THF溶液中所加入三种沉淀剂(甲醇、乙酸、稀盐酸溶液)的体积比例,来改变PAnPE分子链的聚集态结构,进而研究对其发光性能的影响规律.实验结果表明:由于沉淀剂与聚合物PAnPE分子链之间相互作用能力与方式的不同,PAnPE两个荧光峰的发射强度因聚合物分子链聚集结构不同而呈现不同的变化规律,这有助于实现在化学传感器中的应用.
The p-amino group was synthesized by Sonogashira coupling reaction between the monomer 4 - [(2,5-dibromobenzene) ethynyl] aniline and 1,4-diethynyl-2,5-dipentyloxybenzene Phenylenevinylene (PAnPE) with phenylethynyl conjugate pendant groups.The THF solution (2 × 10-5 mol·L-1) of the conjugated polymer showed two strong fluorescence emission peaks at 473 and 519 nm . By adjusting the volume ratio of the three precipitating agents (methanol, acetic acid, dilute hydrochloric acid) added into the PAnPE-THF solution, the molecular structure of the PAnPE chain was changed, and the influence of its concentration on the luminescence properties was studied. The experimental results show that the emission intensity of the two fluorescent peaks of PAnPE varies with the aggregation structure of the polymer chains due to the difference in the ability and mode of interaction between the precipitating agent and the polymer PAnPE molecular chain, To achieve the application of chemical sensors.