The guest CH_(3)CN molecule triggers solid-state photochromism in a Cu_(2)I_(2)-based MOF for advanced time-dependent encryption and inkless erasable printing  

作　　者：Meng-Juan Wang Bo Li Yong-Li Wei Shu-Na Zhao Shuang-Quan Zang 

机构地区：[1]Henan Key Laboratory of Crystalline Molecular Functional Materials,Henan International Joint Laboratory of Tumor Theranostical Cluster Materials,Green Catalysis Center,and College of Chemistry,Zhengzhou University,Zhengzhou 450001,China [2]College of Chemistry and Pharmaceutical Engineering,Nanyang Normal University,Nanyang 473061,China

出　　处：《Chinese Chemical Letters》2024年第3期532-537,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21825106,92061201,22105175);Postdoctoral Research Grant in Henan Province(No.202102001)。

摘　　要：It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent information encryption and inkless erasable printing with long retention times.Herein,a 2D Cu_(2)I_(2)-based MOF with photoresponsive spiropyran(SP)groups orderly installed on its skeleton is developed.The structural isomerization from SP to colored merocyanine(MC)form can be triggered by removing the CH_(3)CN guests.Besides,the degree of structural isomerization and the retention time can be adjusted by controlling the amount of CH_(3)CN guests,exhibiting dynamic photochromic behavior with multicolor states and tunable retention time.Based on these advantages,time-dependent information encryption is successfully achieved.Furthermore,the long retention time(>72 h)of the MC form under daylight conditions in the CH_(3)CN-removed Cu_(2)I_(2)-based MOF and good repeatability make it promising in various applications,such as temporary calendars,price-cards,billboards,and reusable identity cards.This work provides a novel design strategy to fabricate multi-functional MOF-based smart materials for challenging applications of time-dependent information encryption and inkless erasable printing.

关 键 词：Stimuli-responsive materials Spiropyran Solid-state photochromism Time-dependent encryption Inkless erasable printing 

分 类 号：TB34[一般工业技术—材料科学与工程]