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合成了一种新单体5,8-二(5′-溴-3,4-乙撑二氧噻基)-萘基喹喔啉,并通过Sonogashira偶合反应将此单体与带有不同长链烷氧基的对苯乙炔进行交替共聚,得到了聚[(2,5-二庚氧基-1,4-苯撑)乙炔撑-5,8-二(3,4-乙撑二氧噻基)-萘基喹喔啉](PI)和聚[(2,5-二十二烷氧基-1,4-苯撑)乙炔撑-5,8-二(3,4-乙撑二氧噻基)-萘基喹喔啉](PII)。采用核磁共振氢谱、傅里叶红外光谱、紫外-可见光谱、荧光光谱、循环伏安和热重分析对聚合物进行了表征。结果表明:共聚物PI和PII有相似的光学特性,均在490 nm处出现紫外-可见最大吸收峰,在613 nm处出现荧光最大发射峰;热稳定性和电化学活性较好;在-1.0~2.0 V出现电致变色现象,颜色由红色变为深蓝色。
A novel monomeric 5,8-bis (5’-bromo-3,4-ethylenedioxynilyl) -naphthylquinoxaline was synthesized and this monomer was reacted with a compound of different length (2,5- diheptoxy-1,4-phenylene) acetylene-5,8-di (3,4-ethylenedioxy (PI) and poly [(2,5-docosyloxy-1,4-phenylene) acetylene-5,8-di (3,4-ethylene Dioxo-thienyl) -naphthylquinoxaline] (PII). The polymers were characterized by 1H - NMR, FT - IR, UV - Vis, fluorescence spectroscopy, cyclic voltammetry and thermogravimetric analysis. The results showed that the copolymers PI and PII had similar optical properties, both showed the UV-visible maximum absorption at 490 nm and the maximum fluorescence emission peak at 613 nm. The thermal stability and electrochemical activity of PI and PII were better at -1.0 ~ 2.0 V electrochromism occurs, the color changes from red to dark blue.