Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Department of Chemical and Biomedical Engineering, Institute for Advanced Study, and Guangdong Hong Kong Macro Joint Laboratory of Optoelectronic and Magnetic Functional Materials, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130000, China.
J Am Chem Soc. 2021 Jun 30;143(25):9468-9477. doi: 10.1021/jacs.1c02594. Epub 2021 Jun 21.
Solid-state molecular motions (SSMM) play a critical role in adjusting behaviors and properties of materials. However, research on SSMM, especially for multicomponent systems, suffers from various problems and is rarely explored. Herein, through collaboration with cocrystal engineering, visualization and manipulation of SSMM in two-component systems, namely, FSBO (()-2-(4-fluorostyryl)benzo[]oxazole)/TCB (1,2,4,5-tetracyanobenzene) and PVBO (()-2-(2-(pyridin-4-yl)vinyl)benzo[]oxazole)/TCB, were realized. The obtained yellow-emissive F/T (FSBO/TCB) cocrystal displayed turn-on fluorescence, and the green-emissive P/T (PVBO/TCB) cocrystal presented redder emission, both of which exhibited an aggregation-induced emission property. At varied pressure and temperature, the grinding mixtures of FSBO/TCB and PVBO/TCB displayed different molecular motions that were readily observed through the fluorescence signal. Notably, even without grinding, FSBO and TCB molecules could move over for 4 mm in a 1D tube. The unique emission changes induced by SSMM were applied in information storage and dynamic anticounterfeiting. This work not only visualized and manipulated SSMM but offered more insights for multicomponent study in aggregate science.
固态分子运动（SSMM）在调节材料的行为和性质方面起着关键作用。然而，SSMM 的研究，特别是多组分系统的研究，存在各种问题，很少被探索。在此，通过与共晶工程的合作，实现了两个组分系统，即 FSBO((()-2-(4-氟苯乙烯基)苯并[]恶唑)/TCB(1,2,4,5-四氰基苯)和 PVBO((()-2-(2-(吡啶-4-基)乙烯基)苯并[]恶唑)/TCB 中 SSMM 的可视化和操纵。所得到的黄色发射 F/T(FSBO/TCB)共晶显示出开启荧光，而绿色发射 P/T(PVBO/TCB)共晶呈现出更红的发射，两者都表现出聚集诱导发射性质。在不同的压力和温度下，FSBO/TCB 和 PVBO/TCB 的研磨混合物显示出不同的分子运动，通过荧光信号很容易观察到。值得注意的是，即使不研磨，FSBO 和 TCB 分子也可以在一维管中移动 4 毫米。SSMM 引起的独特发射变化被应用于信息存储和动态防伪。这项工作不仅可视化和操纵了 SSMM，还为聚集科学中的多组分研究提供了更多的见解。
