In this study, 5,8-dibromo-2,3-bis(4-(decyloxy) phenyl) pyrido[4,3-b]pyrazine was synthesized and used as the acceptor unit, which then be coupled with three thiophene derivatives (3-methylthiophen, 3-methoxythiophen and 3,4-dimethoxythiophen) to give rise to three novel monomers, 2,3-bis(3-methoxythiophen and 3,4-dimethoxythiophen) to give rise to three novel monomers, 2,3-bis(4-decyloxy) phenyl)-5,8-bis(3-methylthiophen-2-yl) pyrido[4,3-b]pyrazine(M1), 2,3-bis(4-decyloxy) phenyl)-5,8-bis(3-methoxylthiophen-2-yl) pyrido[4,3-b]pyrazine (M2) and 2,3-bis(4-decyloxy) phenyl)-5,8-bis(3,4-dimethoxylthiophen-2-yl) pyrido [4,3-b]pyrazine(M3). The corresponding polymers P1, P2, P3 were obtained by electropolymerization method. These polymers were characterized in terms of their spectroelectrochemical and electrochemical properties by cyclic voltammetry and UV-Vis-NIR spectroscopy. The band gaps of the polymers were calculated based on the spectroelectrochemistry analysis, and were 1.39 eV, 1.136 eV and 1.25 eV for P1, P2, P3, respectively. Electrochromic investigations showed that P1 switched between blue and colorless transmissive state, P2 switched between green to transmissive light gray color, and P3 switched between blue to transmissive light brown color. Electrochromic switching studies showed that all three polymers exhibit high coloration efficiency, fast response time, and express more than 45% change in the transmittance in the near-IR region, which could make these polymers useful in applications in NIR electrochromic devices.

在这项研究中，合成了5,8-二溴-2,3-双（4-（癸氧基）苯基）吡啶并[4,3-b]吡嗪并用作受体单元，然后将其与三种噻吩衍生物（ 3-甲基噻吩，3-甲氧基噻吩和3,4-二甲氧基噻吩生成三个新型单体2,3-双（3-甲氧基噻吩和3,4-二甲氧基噻吩）生成三个新型单体2,3-双（4-癸氧基苯基）-5,8-双（3-甲基噻吩-2-基）吡啶并[4,3-b]吡嗪（M1），2,3-双（4-癸氧基）苯基）-5 ，8-双（3-甲氧基噻吩-2-基）吡啶并[4,3-b]吡嗪（M2）和2,3-双（4-癸氧基）苯基）-5,8-双（3,4-二甲氧基噻吩） -2-基）吡啶基[4,3-b]吡嗪（M3）。相应的聚合物P1，P2，P3通过电聚合法获得。通过循环伏安法和UV-Vis-NIR光谱法对这些聚合物的光谱电化学和电化学性质进行了表征。基于光谱电化学分析计算聚合物的带隙，并且P1，P2，P3的带隙分别为1.39eV，1.136eV和1.25eV 。电致变色研究表明，P1在蓝色和无色透射状态之间切换，P2在绿色和浅灰色的透射状态之间切换，P3在蓝色和透射型浅棕色之间切换。电致变色开关研究表明，所有三种聚合物均表现出较高的着色效率，快速的响应时间，并且在近红外区域的透射率变化超过45％，这可能使这些聚合物可用于NIR电致变色器件中。