Abstract A monomer (E)-4′,4‴-(1,2-diphenylethene-1,2-diyl)bis([1,1′-biphenyl]-4-carbaldehyde) (DDBC) with AIE properties and two novel DDBC-basing polyazomethines (coded as P1 and P2) were prepared. They were gained in short time, low cost and mild reaction conditions by a straightforward synthetic path. Fluorescent testing shows that DDBC owns an intense aggregation-induced emission (AIE) characteristics. But unfortunately, the polymers based on DDBC do not have AIE effect. It may be attributed that the molecules in the excited state consume light energy in the form of electron transfer, reducing the proportion of energy outputted from light, thus causing the disappearance of macroscopic fluorescence. Another guess is that the tetraphenylethylene (TPE) unit takes part of the conjugated backbone of the polymer. However, P1 have high coloration efficiency (346.94 cm2 C−1) and P2 have short response time (the color switching time is 3.43 s and the bleaching time is 1.41 s at 470 nm). Moreover, P1 has electrochromic properties in the near-infrared field. Thus, these features demonstrate that these two novel polymers have great potential as electrochromic materials in optoelectronics applications.

中文翻译：

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基于四苯基乙烯单体的新型 DAD 共轭聚合物用于电致变色

摘要 一种单体 (E)-4',4‴-(1,2-diphenylethene-1,2-diyl)bis([1,1'-biphenyl]-4-carbaldehyde) (DDBC)制备了基于 DDBC 的聚偶氮甲碱（编码为 P1 和 P2）。它们是通过简单的合成途径在短时间内、低成本和温和的反应条件下获得的。荧光测试表明，DDBC 具有强烈的聚集诱导发射 (AIE) 特性。但遗憾的是，基于 DDBC 的聚合物没有 AIE 效应。可能归因于处于激发态的分子以电子转移的形式消耗光能，降低了光输出能量的比例，从而导致宏观荧光消失。另一种猜测是四苯基乙烯 (TPE) 单元占据了聚合物共轭骨架的一部分。然而，P1 具有较高的着色效率（346.94 cm2 C-1），P2 具有较短的响应时间（颜色切换时间为 3.43 s，470 nm 处的漂白时间为 1.41 s）。此外，P1在近红外场具有电致变色特性。因此，这些特征表明这两种新型聚合物在光电应用中作为电致变色材料具有巨大潜力。