Synthesis of Mo(V) Dimers of the Form [Mo < inf> 2 O < inf> 2 (acac) < inf> 2 (μ-O)(μ- OC < inf> 2 H < inf> 5 )(μ-O < inf> 2 CR)], the Tetramer [Mo < inf> 2 O < inf> 2 (acac) < inf> 2 (μ-O)(μ- OC < inf> 2 H < inf> 5 )(μ-O < inf> 2 C)C < inf> 6 H < inf> 4 (p-μ-O < inf> 2 C)Mo < inf> 2 O < inf> 2 (acac) < inf> 2 (μ-O)

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Reaction of bis(acetylacetonato)dioxomolybdenum(VI) (MoO2(acac)2) with benzoic acid, in ethanol, yielded an oxo, ethoxide and benzoate-bridged dinuclear Mo(V) species Mo2O2(acac)2(μ-O)(μ- OC2H5)(μ-OOCC6H5) (1), with two terminal "MoO" units and one acac ligand retained on each Mo atom. This complex was analysed by IR and 1H NMR spectroscopy, X-ray crystallography and elemental analyses. The same reaction with substituted benzoic acids (o-OH)C6H4COOH, (p-Cl)C6H4COOH, (2,4-(OH)2)C6H3COOH and (o-I)C6H4COOH produced a series of dinuclear complexes, all of which were characterized by IR and 1H NMR spectroscopy and elemental analyses. Terephthalic acid ((p-COOH)C6H4(COOH)) on reaction with MoO2(acac)2 resulted in a tetramer [Mo2O2(acac)2(μ-O)(μ- OC2H5)(μ-O2C)C6H4(p-μ-O 2C)Mo2O2(acac)2(μ-O)(μ -OC2H5)] (6) which was evident from the 1H NMR spectrum and elemental analyses. The role of ethanol as a reducing agent has proved instrumental in the synthesis of these dimeric Mo(V) complexes. The synthetic details and characterization by spectroscopic and X-ray crystallographic techniques are discussed. © 2010 Springer Science+Business Media, LLC.

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Journal of Cluster Science