首页|The guest CH3CN molecule triggers solid-state photochromism in a Cu2I2-based MOF for advanced time-dependent encryption and inkless erasable printing
The guest CH3CN molecule triggers solid-state photochromism in a Cu2I2-based MOF for advanced time-dependent encryption and inkless erasable printing
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It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent infor-mation encryption and inkless erasable printing with long retention times.Herein,a 2D Cu2I2-based MOF with photoresponsive spiropyran(SP)groups orderly installed on its skeleton is developed.The struc-tural isomerization from SP to colored merocyanine(MC)form can be triggered by removing the CH3CN guests.Besides,the degree of structural isomerization and the retention time can be adjusted by control-ling the amount of CH3CN 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(＞72h)of the MC form under daylight conditions in the CH3CN-removed Cu2I2-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.
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
College of Chemistry and Pharmaceutical Engineering,Nanyang Normal University,Nanyang 473061,China
国家自然科学基金国家自然科学基金国家自然科学基金Postdoctoral Research Grant in Henan Province
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