Two swivel-cruciform D-A conjugated monomers (BTBBT and BTDQL) combining 5,5′-bibenzo[c] (Lv et al., 2017; Higginbotham et al., 2018; Dai et al., 2017) [1,2,5]thiadiazole (BBT) and 2,2′,3,3′-tetramethyl-6,6′-biquinoxaline (DQL) as the A units and 2,2′-bithiophene (BT) as the D unit are synthesized. The corresponding polymer films (pBTBBT and pBTDQL) are smoothly obtained on ITO-glass via electrochemical polymerization. Owing to the structural similarity, BTBBT and BTDQL enable to be electropolymerized under the same conditions, resulting in the similar thickness and surface morphology of their corresponding polymer films. Interestingly, pBTDQL displays the coloration time of 0.9 s at λ_max and 0.5 s at 900 nm, which is much shorter than that of pBTBBT with the coloration time of 6.3 s at λ_max and 3.0 s at 900 nm under the same conditions. The obviously rapider electrochromic switching rate of pBTDQL is attributed to its lower oxidation potentials and higher redox charge as evidenced by cyclic voltammetry results, which indicate an easier and more charge injection during electrochemical process. The electrochemical impedance spectroscopy results further demonstrate that pBTDQL exhibits the lower charge-transfer resistance and ion-diffusion resistance. These data indicate that charge transport property of conjugated polymer plays a key role on the electrochromic switching rate of pBTBBT and pBTDQL, and additionally DQL could serve as an electron-accepting building block for the constructions of faster switching conjugated polymer-based electrochromic materials.

结合5,5'-联苯并[c]的两种回转-十字形DA共轭单体（BTBBT和BTDQL）（Lv等，2017; Higginbotham等，2018; Dai等，2017）[1,2,5合成了作为A单元的2,2'，3,3'-四甲基-6,6'-联喹喔啉（DQL）和作为D单元的2,2'-联噻吩（BT）的噻二唑（BBT）。通过电化学聚合在ITO玻璃上顺利获得相应的聚合物薄膜（pBTBBT和pBTDQL）。由于结构相似性，BTBBT和BTDQL能够在相同条件下进行电聚合，从而导致其相应聚合物薄膜的厚度和表面形态相似。有趣的是，在0.9秒pBTDQL显示的着色时间λ_最大和0.5秒，在900纳米，这比pBTBBT与在6.3 S中的着色时间短得多λ_最大与在相同条件下3.0 s的900纳米。pBTDQL的明显更快的电致变色转换速率归因于其较低的氧化电势和较高的氧化还原电荷，如循环伏安法结果所表明的，这表明在电化学过程中更容易且更多的电荷注入。电化学阻抗谱结果进一步证明pBTDQL表现出较低的电荷转移电阻和离子扩散电阻。这些数据表明，共轭聚合物的电荷传输性质在pBTBBT和pBTDQL的电致变色速率中起着关键作用，另外DQL可以用作更快转换基于共轭聚合物的电致变色材料的结构的电子接受基块。