EDTA-Reduction of Water to Molecular Hydrogen Catalyzed by Visible-Light-Response TiO2-Based Materials Sensitized by Dawson- and Keggin-Type Rhenium(V)-Containing Polyoxotungstates
نویسندگان
چکیده
The synthesis and characterization of a Keggin-type mono-rhenium(V)substituted polyoxotungstate are described. The dimethylammonium salt [Me2NH2]4[PW11ReO40] was obtained as analytically pure homogeneous black-purple crystals by reacting mono-lacunary Keggin polyoxotungstate with [ReCl6] in water, followed by crystallization from acetone at ca. 5 °C. Single-crystal X-ray structural analysis of [PW11ReO40] revealed a monomeric structure with overall Td symmetry. Characterization of [Me2NH2]4[PW11ReO40] was also accomplished by elemental analysis, magnetic susceptibility, TG/DTA, FTIR, UV-vis, diffuse reflectance (DR) UV-vis, and solution P-NMR spectroscopy. Furthermore, [PW11ReO40] and the Dawson-type dirhenium(V)-oxido-bridged polyoxotungstate [O{Re(OH)(α2-P2W17O61)}2] were supported onto anatase TiO2 surface by the precipitation methods using CsCl and Pt(NH3)4Cl2. With these materials, hydrogen evolution from water in the presence of EDTA⋅2Na (ethylenediamine tetraacetic acid disodium salt) under visible light irradiation (≥400 nm) was achieved. OPEN ACCESS Materials 2010, 3 898
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