Wang Qin, Guo Jun-Zhuo, Luo Dan, Ye Ming-Fu, Lin Rui-Lian, Sun Wen-Qi, Liu Jing-Xin
College of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, P. R. China.
Information Materials and Devices Applications Key Laboratory of Sichuan Provincial Universities, Chengdu University of Information Technology, Chengdu 610225, P. R. China.
Phys Chem Chem Phys. 2022 Nov 2;24(42):25930-25936. doi: 10.1039/d2cp03516b.
In order to investigate the photochromic mechanism of photochromic materials based on supramolecular host-guest systems, we designed and synthesized a unique viologen derivative (benzimidazolyl benzyl viologen, guest 1·Cl), which does not contain oxygen atoms. The binding interaction of guest 1 with host cucurbit[7]uril (Q[7]) was investigated by various techniques. The obtained supramolecular host-guest complex 1@Q[7] exhibits interesting fluorescence emission and reversible photochromism. The ESR and XPS experimental data suggest that the photochromic process of the complex 1@Q[7] comes from the electron transfer from the carbonyl O atoms of the host Q[7] to the bipyridinium N atoms of the guest 1.
为了研究基于超分子主客体体系的光致变色材料的光致变色机理，我们设计并合成了一种独特的、不含氧原子的紫精衍生物（苯并咪唑基苄基紫精，客体1·Cl）。通过多种技术研究了客体1与主体葫芦[7]脲（Q[7]）的结合相互作用。所得到的超分子主客体复合物1@Q[7]表现出有趣的荧光发射和可逆光致变色现象。电子顺磁共振（ESR）和X射线光电子能谱（XPS）实验数据表明，复合物1@Q[7]的光致变色过程源于主体Q[7]的羰基O原子向客体1的联吡啶鎓N原子的电子转移。
