Abstract
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.
基金项目
国家自然科学基金(21825106)
国家自然科学基金(92061201)
国家自然科学基金(22105175)
Postdoctoral Research Grant in Henan Province(202102001)
NETL
NSTL
万方数据