有机晶体的机械致色性和机械变形性能:可调的堆积结构用于实现发光可逆和弹性  

Mechanochromism and mechanical deformation of organic crystals:tunable packing structure for achieving luminescence reversibility and elasticity

作　　者：姜志成 陈奎 田贝倩 郑祉鑫 姚昱同 王娜 王霆 郝红勋 Zhicheng Jiang;Kui Chen;Beiqian Tian;Zhixin Zheng;Yutong Yao;Na Wang;Ting Wang;Hongxun Hao(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)

机构地区：[1]National Engineering Research Center of Industrial Crystallization Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China

出　　处：《Science China Materials》2024年第1期232-241,共10页中国科学（材料科学）（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (22208237);China Postdoctoral Science Foundation (2021M692382)。

摘　　要：具有机械致变色和变形性能的有机发光晶体材料因其广阔的应用潜力而备受瞩目.本文报道了两种氰基苯乙烯衍生物(FPPA和FPLA)及其晶体多晶型,系统地研究了其机械响应性能与晶体堆积结构的关系.晶体学、光谱分析和理论模拟表明,机械研磨引发的荧光转换源自两种多晶型之间的相变.各向异性的剪切力引发分子由松散到紧密的堆积结构变化以抵抗机械研磨干扰.此外,具有交叉互锁和波纹状结构的针状晶体在受到局部外力作用时表现出优异的弹性性能.最后,探索了晶体材料荧光切换性能在信息存储和加密系统的应用.Organic luminescent crystals with mechano-chromic and mechanical deformation properties are fasci-nating owing to their vast application prospects.In this study,two types of cyanostyrene derivatives,FPPA and FPLA,and their polymorphs were prepared to systematically examine the relation between mechano-responsive properties and crystal packing structures.Crystallographic and spectroscopic ana-lyses and theoretical simulations revealed that the lumines-cence switching triggered by mechanical grinding originates from the crystal-to-crystal transition between the two poly-morphs.Anisotropic shearing induces the molecules in the crystal with loose packing to reorganize into a more compact packing structure to counteract mechanical grinding dis-turbances.A thermo-induced phase transition could be used to recover the original luminescence.In addition,the needle-like crystals of Pr-I and Pentyl-I with interlocked and corru-gated structures display outstanding elasticity when subjected to localized external forces.Reversible and fast luminescence switching between the two polymorphs of FPLA with green and cyan emissions was successfully applied in an information storage and encryption system.

关 键 词：信息存储 晶体材料 机械研磨 多晶型 有机晶体 变形性能 针状晶体 切换性能 

分 类 号：O73[理学—晶体学]