A Ru-Hbpp-based water-oxidation catalyst anchored on rutile TiO2

Laia Francás*, Xavier Sala, Jordi Benet-Buchholz, Lluís Escriche, Antoni Llobet

*Autor corresponent d’aquest treball

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Resum

Two organic ligands based on bis-(2-pyridyl)pyrazole (Hbpp) functionalized with a para-methylenebenzoic acid (Hbpp-Ra) or its ester derivative (Hbpp-Re) were prepared and characterized. The ester-functionalized ligand was then used to prepare a series of related dinuclear ruthenium complexes of general formula [Ru2 II(L-L)(bpp-Rn)(trpy)2]m+ (L-L=μ-Cl, μ-acetato, or (H2O)2 ; n=e or a; trpy=2,2′:6′,2"-terpyridine; m=2 or 3). The complexes were characterized in solution by 1D and 2D NMR spectroscopy, UV/Vis spectroscopy, and electrochemical techniques. The [Ru2 II(μ-Cl)(bpp-Re)(trpy)2](PF6)2 complex was further characterized in the solid state by X-ray diffraction. The complexes containing the free carboxylic acid ligand were anchored onto rutile TiO2 and treated with 0.1 M triflic acid solution to generate the homologous water-oxidation catalysts TiO2-[Ru2 II(H2O)2(bpp-Ra)(trpy)2]2+. This new hybrid material catalytically oxidizes water to molecular oxygen in a heterogeneous manner using CeIV as chemical oxidant. The generation of molecular oxygen is accompanied by the formation of carbon dioxide as well as some leaching of the Ru catalyst.

Idioma originalEnglish
Pàgines (de-a)321-329
Nombre de pàgines9
RevistaChemSusChem
Volum2
Número4
DOIs
Estat de la publicacióPublicada - 20 d’abr. 2009

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