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Europium-based metal-organic framework as a photocatalyst for the one-electron oxidation of organic compounds

Langmuir, ISSN: 0743-7463, Vol: 26, Issue: 13, Page: 10437-10443
2010
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Article Description

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 Eu 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. © 2010 American Chemical Society.

Bibliographic Details

Choi, Jun Rye; Tachikawa, Takashi; Fujitsuka, Mamoru; Majima, Tetsuro

American Chemical Society (ACS)

Materials Science; Physics and Astronomy; Chemistry

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