Journal
LANGMUIR
Volume 26, Issue 13, Pages 10437-10443Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la101770h
Keywords
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Funding
- National Research Foundation of Korea, Ministry of Education, Science and Technology [R31-10035]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government [22245022, 21750145]
- Grants-in-Aid for Scientific Research [22245022, 21750145, 21350075] Funding Source: KAKEN
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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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