UV and X-ray Dual Photochromism of Two Zn(II)-Viologen Coordination Polymers and Fast Decoloration by Hydrogen Chloride
Dong-Dong Yang, Han–Wen Zheng, Bo Jin, Yong‐Sheng Shi, Tong Xiao, Yu‐Hui Fang, Qiong-Fang Liang, Xiang‐Jun Zheng
Abstract
Two novel viologen-functionalized Zn(II) complexes {[Zn(cbbpy)(PTA)0.5Cl]·2H2O}n (1) and [Zn3(cbbpy)2(PTA)2(H2O)6]·(PTA)·4H2O}n (2) with a one-dimensional chain of quadrilateral rings and three-fold interpenetrating two-dimensional networks, respectively, have been synthesized and characterized. Both 1 and 2 display high contrast reversible photochromic properties under UV and X-rays. In particular, 1 exhibits an ultrafast response to UV, and the photoresponse time is only 0.5 s, which is faster than that of most currently reported photochromic complexes, and thus this compound shows potential applications in monitoring the UV light. Importantly, this is the first time that the colored photoproducts can be quickly decolored by HCl vapor, and the circulation can be realized after fumigation with NH3 vapor. Moreover, 1 also shows potential applications in inkless printing and anticounterfeiting.