Two novel selenophenothiophene homopolymers, P(SeT1) and P(SeT2), were electrochemically prepared for the first time from their corresponding monomers (i) conjugated 2,5-di(thiophen-2-yl)selenopheno[3,2-b]thiophene (1) and (ii) cross-conjugated 2,5-di(thiophen-2-yl)selenopheno[2,3-b]thiophene (2) to explore their electrochromic behaviors. The effects of conjugation and cross conjugation on the electrochromic performances and electrochemistry and spectroelectrochemistry of the polymers were systematically studied. While the cross conjugated polymer film of P(SeT2) displayed a color change from yellow to a light green upon oxidation, the conjugated polymer film of P(SeT1) showed an orange color in the neutral and a claret red in the oxidized state. The polymer P(SeT1), owing to its extended π-conjugation, had a lower optical band gap of 1.82 eV, compared to the polymer P(SeT2) (2.27 eV). Their electrochromic performances displayed that P(SeT2) had a higher optical contrast (46.2%) and a lower response time (oxidation time of 1.34 s at 680 nm). The first electrochemically-synthesized poly(selenophenothiophene) films showed good electrochemical activity and electrochromic properties. Moreover, this pioneering study suggests a new strategy for designing and preparing organic electrochromic materials possessing selenophenothiophene units.

两种新型硒吩并噻吩均聚物P(SeT1)和P(SeT2)首次由其相应的单体 (i) 共轭 2,5-二(噻吩-2-基) 硒酚 [3,2-b] 电化学制备噻吩 ( 1 ) 和 (ii) 交叉共轭的 2,5-二(噻吩-2-基) 硒酚 [2,3-b] 噻吩 ( 2 ) 以探索它们的电致变色行为。系统研究了共轭和交叉共轭对聚合物电致变色性能以及电化学和光谱电化学的影响。虽然P(SeT2)的交叉共轭聚合物薄膜在氧化时显示出从黄色到浅绿色的颜色变化，但P(SeT1)的共轭聚合物薄膜在中性状态下呈橙色，在氧化状态下呈紫红色。与聚合物P(SeT2 ) (2.27 eV)相比，聚合物P(SeT1)由于其扩展的 π 共轭，具有 1.82 eV 的较低光学带隙。它们的电致变色性能表明P(SeT2)具有更高的光学对比度 (46.2%) 和更低的响应时间（680 nm 处的氧化时间为 1.34 s）。第一个电化学合成的聚（硒吩并噻吩）薄膜表现出良好的电化学活性和电致变色性能。此外，这项开创性研究提出了一种设计和制备具有硒代苯并噻吩单元的有机电致变色材料的新策略。