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Oxovanadium(IV) complexes of imidazole-4-acetic, imidazole-4,5-dicarboxylic and pyrazole-3,5-dicarboxylic acids

Sanna, Daniele and Micera, Giovanni and Buglyó, Péter and Kiss, Tamás and Gajda, Tamás and Surdy, Péter (1998) Oxovanadium(IV) complexes of imidazole-4-acetic, imidazole-4,5-dicarboxylic and pyrazole-3,5-dicarboxylic acids. Inorganica Chimica Acta, Vol. 268 (2), p. 297-305. ISSN 0020-1693. Article.

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DOI: 10.1016/S0020-1693(97)05761-7


Complex formation between oxovanadium(IV) and several diazole derivatives (imidazole-4-acetic, imidazole-4,5-dicarboxylic and pyrazole-3,5-dicarboxylic acid) was studied in aqueous solution by pH-potentiometric and spectroscopic (electron paramagnetic resonance and electronic absorption) techniques. The results show that the imidazole-4-acetate ligand, being suitable for bidentate coordination, forms monomeric or mixed hydroxo-bridged species. In the case of the dicarboxylic acids both having two bidentate sites for metal binding the formation of tetrameric or dimeric complexes is strongly favored. Pyrazole-3,5-dicarboxylic acid forms dinuclear, while imidazole-4,5-dicarboxylic acid forms cyclic tetrameric species, both types containing diazolate bridges. There is evidence for the VO2+-supported deprotonation of the imidazole N1 (pyrrole-type) group at pH as low as 5 in aqueous solution.

Item Type:Article
ID Code:1468
Uncontrolled Keywords:PH-potentiometry, oxovanadium complexes, imidazole-carboxylic acid complexes
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Additional Information:Pubblicato online il 20 aprile 1998.
Deposited On:18 Aug 2009 10:05

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