Organic polymorphic crystals with multi-stimuli response:excellent mechanical elasticity,novel two-stage heterotropic photochromism and self-reversible acidichromism
Smart multi-stimuli responsive organic mate-rials have become increasingly favored due to their advantages of high stability and easy regulation.In this study,a cyanos-tilbene derivative((αZ)-2-chloro-α-[(4-methoxyphenyl)me-thylene]-5-pyridinehyde,TAR)was successfully synthesized,and its polymorphs(TAR-1 and TAR-2)exhibited multiple responsive behaviors under different stimulus conditions.TAR-1 is supposed to have excellent mechanical properties,while TAR-2 shows fascinating heterotropic photochromism(green-cyan-yellow)under different intensities of ultraviolet(UV)irradiation,which has never been reported in previous studies.Further investigation revealed that this was attributed to different degrees of[2+2]cycloaddition induced by UV light.In addition,both polymorphs could be protonated during Trifluoroacetic acid fuming and deprotonate auto-matically after fuming,accompanied by the significant varia-tion in fluorescence.Finally,two scenarios were designed based on their unique stimuli-responsive properties,which proved their promising potential in fields of information se-curity and anti-counterfeiting encryption.
National Engineering Research Center of Industrial Crystallization Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China
State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
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