分子
溶剂
极性(国际关系)
甲苯
荧光
吸附
化学
氯仿
金属有机骨架
溶剂极性
化学物理
粒子(生态学)
光化学
荧光光谱法
光谱学
物理化学
有机化学
光学
地质学
物理
细胞
海洋学
量子力学
生物化学
作者
Jun Rye Choi,Takashi Tachikawa,Mamoru Fujitsuka,Tetsuro Majima
摘要
We report in situ observations of molecular interactions and photodynamics for the polarity-sensitive fluorescence dye 4-dimethylamino-4′-nitrostilbene (DNS) when encapsulated inside of metal−organic frameworks (MOFs) by utilizing single-molecule, single-particle fluorescence spectroscopy. While the fluorescence intensity from DNS molecules adsorbed onto the surface of MOF-177 particles exhibited a strong solvent polarity dependence toward external solvent exchanges, the intensity from molecules encapsulated inside of well-defined MOF-177 particles slightly changed when the solvent was switched from toluene to chloroform. Furthermore, the photostability of the DNS molecules was significantly enhanced by incorporation into the MOF host. These observations strongly suggest that guest molecules encapsulated in MOFs should be protected from external solvent and gas molecules. The photoblinking behavior of encapsulated single DNS molecules was also observed and analyzed in terms of the probability density.
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