铕
镧系元素
金属有机骨架
电子转移
光化学
猝灭(荧光)
发光
化学
光诱导电子转移
光催化
荧光
分子
金属
物理化学
离子
材料科学
催化作用
有机化学
物理
光电子学
吸附
量子力学
作者
Jun Rye Choi,Takashi Tachikawa,Mamoru Fujitsuka,Tetsuro Majima
出处
期刊:Langmuir
[American Chemical Society]
日期:2010-06-01
卷期号:26 (13): 10437-10443
被引量:101
摘要
Lanthanide-based metal−organic frameworks (Ln-MOFs) are fascinating because of their versatile coordination geometry, unique luminescent and magnetic properties, and possible high framework stability to water. We synthesized nanosized europium-based MOF (Eu-MOF) particles and investigated the photoinduced electron transfer between the excited Eu-MOF nanoparticles and various organic compounds, such as aromatic sulfides and amines. From the time-resolved emission measurements, the bimolecular quenching rate constants of luminescence from the Eu3+ ions in the MOF framework by electron donors were determined and explained in terms of the Marcus theory of electron-transfer reactions. Furthermore, spatially resolved emission quenching images obtained by confocal fluorescence microscopy revealed that small (large) quencher molecules quickly (slowly) and homogeneously (inhomogeneously) penetrate microsized Eu-MOF crystals. These observations led us confidently to assume the possibility that Eu-MOFs work as a size-selective photocatalyst for the one-electron oxidation of organic compounds.
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