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Materials 2010, 3(2), 897-917; doi:10.3390/ma3020897
Article

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

1,* , 1, 1, 1, 2, 2 and 2
Received: 27 November 2009 / Revised: 12 January 2010 / Accepted: 2 February 2010 / Published: 2 February 2010
(This article belongs to the Special Issue Polyoxometalate Compounds)
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Abstract: The synthesis and characterization of a Keggin-type mono-rhenium(V)-substituted polyoxotungstate are described. The dimethylammonium salt [Me2NH2]4[PW11ReVO40] was obtained as analytically pure homogeneous black-purple crystals by reacting mono-lacunary Keggin polyoxotungstate with [ReIVCl6]2- in water, followed by crystallization from acetone at ca. 5 °C. Single-crystal X-ray structural analysis of [PW11ReVO40]4- revealed a monomeric structure with overall Td symmetry. Characterization of [Me2NH2]4[PW11ReVO40] was also accomplished by elemental analysis, magnetic susceptibility, TG/DTA, FTIR, UV-vis, diffuse reflectance (DR) UV-vis, and solution 31P-NMR spectroscopy. Furthermore, [PW11ReVO40]4- and the Dawson-type dirhenium(V)-oxido-bridged polyoxotungstate [O{ReV(OH)(α2-P2W17O61)}2]14- 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.
Keywords: polyoxometalate; rhenium; titanium dioxide; hydrogen evolution; visible light polyoxometalate; rhenium; titanium dioxide; hydrogen evolution; visible light
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kato, C.N.; Hara, K.; Kato, M.; Amano, H.; Sato, K.; Kataoka, Y.; Mori, W. 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. Materials 2010, 3, 897-917.

AMA Style

Kato CN, Hara K, Kato M, Amano H, Sato K, Kataoka Y, Mori W. 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. Materials. 2010; 3(2):897-917.

Chicago/Turabian Style

Kato, Chika Nozaki; Hara, Kazunobu; Kato, Masao; Amano, Hidekuni; Sato, Konomi; Kataoka, Yusuke; Mori, Wasuke. 2010. "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." Materials 3, no. 2: 897-917.


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