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

Chika Nozaki Kato²  Kazunobu Hara²  Masao Kato²  Hidekuni Amano²  Konomi Sato¹  Yusuke Kataoka¹ 

[1] Department of Chemistry, Faculty of Science, Kanagawa University, Tsuchiya 2946, Hiratsuka, Kanagawa 259-1293, Japan;Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan

关键词: polyoxometalate;    rhenium;    titanium dioxide;    hydrogen evolution;    visible light;   

DOI  :  10.3390/ma3020897

来源: mdpi

【 摘 要 】

The synthesis and characterization of a Keggin-type mono-rhenium(V)- substituted polyoxotungstate are described. The dimethylammonium salt [Me₂NH₂]₄[PW₁₁Re^VO₄₀] was obtained as analytically pure homogeneous black-purple crystals by reacting mono-lacunary Keggin polyoxotungstate with [Re^IVCl₆]^2- in water, followed by crystallization from acetone at ca. 5 °C. Single-crystal X-ray structural analysis of [PW₁₁Re^VO₄₀]^4- revealed a monomeric structure with overall T_d symmetry. Characterization of [Me₂NH₂]₄[PW₁₁Re^VO₄₀] was also accomplished by elemental analysis, magnetic susceptibility, TG/DTA, FTIR, UV-vis, diffuse reflectance (DR) UV-vis, and solution ³¹P-NMR spectroscopy. Furthermore, [PW₁₁Re^VO₄₀]^4- and the Dawson-type dirhenium(V)-oxido-bridged polyoxotungstate [O{Re^V(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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.