Liu Hao, Bian Zhengyi, Cheng Qinyu, Lan Linfeng, Wang Yue, Zhang Hongyu
State Key Laboratory of Supramolecular Structure and Materials , College of Chemistry , Jilin University , Qianjin Street , Changchun , P. R. China . Email:
Chem Sci. 2018 Oct 2;10(1):227-232. doi: 10.1039/c8sc03135e. eCollection 2019 Jan 7.
Recently, the study of flexible (elastically bendable and plastically bendable) organic single crystals has become a hot research field in crystal engineering. In general, crystal elasticity and plasticity are incompatible with each other. Different from the applications of fluorescent crystals, the applications of room-temperature phosphorescence (RTP) materials generally ignore the crystallographic nature of large single crystals. Herein, we creatively combine elasticity and plasticity based on one RTP crystal 4,4'-dibromobenzil DBBZL. The in-depth study of the irreversible transformation between elastic bending and plastic bending provided important insights into the mechanism of both elastically bendable crystals and plastically bendable crystals in crystal engineering. The DBBZL crystal exhibits elastic bending (reversible) under external stress, whereas it shows plastic bending (irreversible) after excessive bending. Notably, the first phosphorescent optical waveguides of large single RTP crystals are realized not only in straight state, but also in elastic bent state and plastic bent state.
近年来，柔性（可弹性弯曲和可塑性弯曲）有机单晶的研究已成为晶体工程领域的一个热门研究方向。一般来说，晶体的弹性和塑性是相互矛盾的。与荧光晶体的应用不同，室温磷光（RTP）材料的应用通常忽略了大单晶的晶体学性质。在此，我们基于一种RTP晶体4,4'-二溴苯偶酰（DBBZL）创造性地将弹性和塑性结合起来。对弹性弯曲和塑性弯曲之间不可逆转变的深入研究为晶体工程中可弹性弯曲晶体和可塑性弯曲晶体的机理提供了重要见解。DBBZL晶体在外部应力作用下表现出弹性弯曲（可逆），而在过度弯曲后则表现出塑性弯曲（不可逆）。值得注意的是，不仅在直的状态下，而且在弹性弯曲状态和塑性弯曲状态下都实现了大型RTP单晶的首个磷光光波导。
