Zheng Xin, Liu Xiaojing, Liu Lijie, Li Xiaochuan, Jiang Song, Niu Caoyuan, Xie Puhui, Liu Guoxing, Cao Zhanqi, Ren Yunlai, Qin Yuchen, Wang Jianji
College of Science, Henan Agricultural University, Zhengzhou, 450002, P. R. China.
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Angew Chem Int Ed Engl. 2022 Jan 3;61(1):e202113073. doi: 10.1002/anie.202113073. Epub 2021 Nov 22.
Fluorescent single crystals that respond to multiple external stimuli are of great interest in molecular machines, sensors, and displays. The integration of photo- or acid-induced fluorescence enhancement and bending in one organic crystal, however, has not been reported yet. Herein, we report the interesting plastic photomechanical bending and switching on of the fluorescence of an azine crystal in a single-crystal transformation, due to extended π-conjugation and molecular slippage. Moreover, the fluorescent plastic bending driven by multiple volatile acid vapors was firstly observed, and attributed to the synergistic effect of push-pull electronic structure and hydrogen bonding. The single crystal also shows high elasticity under external force. In addition, reversible fluorescence switching can be triggered by grinding and solvent fuming, as well as by the adsorption and desorption of HCl vapor. The integration of plastic, elastic bending and switch-on fluorescence into one single crystal provides a new strategy for next-generation smart materials.
对多种外部刺激有响应的荧光单晶在分子机器、传感器和显示器领域极具吸引力。然而，尚未有关于在一种有机晶体中同时实现光致或酸致荧光增强与弯曲的报道。在此，我们报道了一种嗪晶体在单晶转变过程中有趣的塑性光机械弯曲以及荧光开启现象，这归因于扩展的π共轭和分子滑移。此外，首次观察到由多种挥发性酸蒸气驱动的荧光塑性弯曲，这归因于推挽电子结构和氢键的协同作用。该单晶在外力作用下还表现出高弹性。此外，研磨、溶剂熏蒸以及HCl蒸气的吸附和解吸均可触发可逆的荧光开关效应。将塑性、弹性弯曲和荧光开启集成于一个单晶中，为下一代智能材料提供了一种新策略。
