In this study, novel electrochromic copolymers of 3,4-ethylenedioxythiophene (EDOT) and (E)-1,2-bis(2-fluoro-4-(4-hexylthiophen-2- yl)phenyl)diazene (M1) with different monomer feed ratios were designed and synthesized electrochemically. Electrochemical and spectroelectrochemical characterizations were performed using voltammetry and UV-Vis-NIR spectrophotometry techniques to test the applicability of copolymers for electrochromic applications. In terms of electrochemical behaviors, addition of an electron-rich EDOT unit into the azobenzenecontaining copolymer increased the electron density on the polymer chain and afforded copolymers with very low oxidation potentials at around 0.30 V. While the homopolymers (P1 and PEDOT) exhibited neutral state absorptions centered at 510 and 583 nm, EDOT-bearing copolymers showed red shifted absorptions compared to those of P1 with narrower optical band gaps. In addition, the poor optical contrast and switching times of azobenzene-bearing homopolymer were significantly improved with EDOT addition into the copolymer chain. As a result of the promising electrochromic and kinetic preperties, CoP1.5-bearing single layer electrochromic device that works between purple and light greenish blue colors was constructed and characterized.

中文翻译：

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含偶氮苯的单体和3,4-乙二氧基噻吩（EDOT）的共聚：改进的电致变色器件应用的电化学性能

在这项研究中，新型的3,4-乙撑二氧噻吩（EDOT）和（E设计并合成了不同单体进料比的）-1,2-双（2-氟-4-（4-己基噻吩-2-基）苯基）二烯（M1）并进行了电化学合成。使用伏安法和UV-Vis-NIR分光光度法进行电化学和光谱电化学表征，以测试共聚物在电致变色应用中的适用性。就电化学行为而言，向含偶氮苯的共聚物中添加富电子的EDOT单元可增加聚合物链上的电子密度，并提供在0.30 V左右具有极低氧化电位的共聚物。而均聚物（P1和PEDOT）则呈现中性态吸收中心在510和583 nm处，与P1相比，含EDOT的共聚物的红移吸收具有较窄的光学带隙。此外，通过在共聚物链中加入EDOT，可显着改善含偶氮苯的均聚物的差的光学对比度和转换时间。由于有希望的电致变色和动力学性能，构建并表征了在紫色和浅绿色蓝色之间工作的带有CoP1.5的单层电致变色器件。