Peng Xiaohan, Shi Yuchen, Zeng Zhiqiang, Zheng Jianming, Xu Chunye
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Membranes (Basel). 2022 Feb 28;12(3):277. doi: 10.3390/membranes12030277.
Responsive chromogenic materials have attracted increasing interest among researchers; however, up until now, few materials have exhibited multifunctional chromogenic properties. The coordination polymers (CPs) provide intriguing platforms to design and construct multifunctional materials. Here, a multifunctional photo/electricity responsive CP named Zn-Oxv, which is based on the "extended viologen" (ExV) ligand, was synthesized. The Zn-Oxv exhibited reversible photochromism, photomodulated fluorescence, electrochromism and electrofluorochromism. Furthermore, we prepared Zn-Oxv thin films and investigated electrochromic (EC) properties of viologen-based CPs for the first time. Zn-Oxv thin films showed excellent EC performance with a rapid switching speed (both coloring and bleaching time within 1 s), high coloration efficiency (102.9 cm/C) and transmittance change (exceeding 40%). Notably, the Zn-Oxv is by far the fastest CP EC material based on redox-active ligands ever reported, indicating that the viologen-based CPs could open up a new field of materials for EC applications. Therefore, viologen-based CPs are attractive candidates for the design of novel multi-responsive chromogenic materials and EC materials that could promise creative applications in intelligent technology, dynamic displays and smart sensors.
响应型发色材料已引起研究人员越来越多的关注；然而，到目前为止，很少有材料表现出多功能发色特性。配位聚合物（CPs）为设计和构建多功能材料提供了有趣的平台。在此，合成了一种基于“扩展紫精”（ExV）配体的名为Zn-Oxv的多功能光/电响应CP。Zn-Oxv表现出可逆光致变色、光调制荧光、电致变色和电荧光变色。此外，我们制备了Zn-Oxv薄膜并首次研究了基于紫精的CPs的电致变色（EC）特性。Zn-Oxv薄膜表现出优异的EC性能，具有快速的切换速度（着色和漂白时间均在1秒内）、高着色效率（102.9 cm/C）和透过率变化（超过40%）。值得注意的是，Zn-Oxv是迄今为止报道的基于氧化还原活性配体的最快的CP EC材料，这表明基于紫精的CPs可为EC应用开辟一个新的材料领域。因此，基于紫精的CPs是设计新型多响应发色材料和EC材料的有吸引力的候选者，有望在智能技术、动态显示和智能传感器中实现创新性应用。
