In this work, four new terpyridine-Fe (Ⅱ) coordination polymers () consisting of quinoxaline-based π-spacers were developed, and further deposited on ITO substrates spin-coating process for electrochromic applications. All these Fe (Ⅱ) coordination polymers exhibited fast and reversible electrochromic switching between purple and yellow with high optical contrast as well as high coloration efficiency, and showed good cycle stability. The variation of substituents on the quinoxaline-based π-spacers resulted in tunable electrochromic properties. Remarkably, polymers and with aliphatic substituents on the ligands showed superior optical contrast up to 76.7% and 81.6% around 575 nm, with coloring time around 0.5 s and bleaching time around 2 s, respectively. To the best of our knowledge, gained the highest optical contrast value among the reported electrochromic materials based on Fe-complexes up to date.

中文翻译：

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由喹喔啉基π-间隔基组成的三联吡啶-Fe(II)配位聚合物的分子工程可增强电致变色性能

在这项工作中，开发了四种由喹喔啉基π-间隔基组成的新型三联吡啶-Fe（Ⅱ）配位聚合物（），并进一步通过旋涂工艺沉积在ITO基板上用于电致变色应用。所有这些Fe（Ⅱ）配位聚合物都表现出快速、可逆的紫色和黄色之间的电致变色转换，具有高光学对比度和高着色效率，并表现出良好的循环稳定性。喹喔啉基π-间隔基上取代基的变化导致可调节的电致变色特性。值得注意的是，聚合物和配体上带有脂肪族取代基的聚合物在 575 nm 附近表现出优异的光学对比度，分别高达 76.7% 和 81.6%，着色时间约为 0.5 秒，漂白时间约为 2 秒。据我们所知，在迄今为止报道的基于铁配合物的电致变色材料中，获得了最高的光学对比度值。