发光
量子产额
光致发光
荧光
堆积
金属
化学
超分子化学
材料科学
化学物理
光化学
化学工程
有机化学
分子
光电子学
光学
物理
工程类
作者
Dong Luo,Le-Xiong Wu,Yan Zhang,Yong‐Liang Huang,Xueling Chen,Xiao‐Ping Zhou,Dan Li
标识
DOI:10.1007/s11426-022-1245-1
摘要
Charged metal-organic cages generally produce aggregates with various morphologies and different properties through the multiple supramolecular interactions in solution. Herein, a luminescent hexahedral metal-organic cage containing pyrene chromophores is successfully constructed through coordination-driven subcomponent self-assembly. The cage exhibits novel spontaneous aggregation in a dilute solution and time-dependent luminescence enhancement behavior during the subsequent incubation process. Dynamic light scatter (DLS) and transmission electron microscopy (TEM) results prove that the metal-organic cages can form blackberry-like aggregates in methanol dilute solution. Unexpectedly, the luminescent intensity of this system shows a linear increase with the extension of the incubation time in methanol, and this process is also reflected in the change in the quantum yield of the system (2% to over 80% after 5 days incubation time). Ultraviolet-visible (UV-vis), 1H nuclear magnetic resonance (1H NMR) and mass spectra show that metal-organic cages can stably exist in dilute solution. Time-depended DLS and TEM data reveal that the aggregates of metal-organic cages are gradually changed from the dense state to the loose one, which may involve the transition of the system from an energy unstable state to a stable one, probably leading to the unusual time-dependent luminescent property. This unique time-dependent luminescent cage aggregate can be potentially applied as a “supramolecular time meter”.
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