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J. Chim. Phys.
Volume 95, Number 10, November/December 1998
Page(s) 2280 - 2299
DOI: 10.1051/jcp:1998358

J. Chim. Phys. Vol. 95, N°10  p. 2280-2299

Complexes of oxovanadium(IV), dioxovanadium(V) and dioxouranium(VI) with aminoacids in aqueous solution

P. Lagrange, M. Schneider and J. Lagrange

UMR 7512 du CNRS, Laboratoire de Cinétique et Analyse, ECPM, Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France

The equilibria between three oxocations (VO 2+, VO 2+ and UO 22+) and several ?- aminoacids (glycine, serine, asparagine, lysine, aspartic acid and glutamic acid) are studied in aqueous solution. Stoichiometry and stability of the complexes formed are determined from a combination of potentiometric and spectroscopic measurements. Solution structures of the different complexes are proposed based on the thermodynamic results. The oxovanadium(IV) complexes appear less stable than the corresponding dioxouranium(VI) and dioxovanadium(V) complexes. VO 2+ can be bound to only one ligand to form monodentate or chelate complexes. UO 22+ and VO 2+ cations may be chelated by one or two ligands.

Les équilibres entre trois oxocations, VO 2+, VO 2+ et UO 22+ et plusieurs $\alpha$-aminoacides, glycine, sérine, asparagine, lysine et acides aspartique et glutamique, sont étudiés en solution aqueuse par potentiométrie couplée à la spectrophotométrie. Les complexes de VO2+ sont moins stables que les complexes de VO2+ et UO22+ de même stoechiométrie. VO 2+ ne peut se lier qu'à un seul ligand pour former soit des complexes monodentés, soit des chélates. UO 22+ et VO 2+ peuvent être chélatés par un ou deux ligands. Des structures hypothétiques en solution sont proposées.

Key words: aminoacid -- oxovanadium -- dioxovanadium -- uranyl -- complexation

© EDP Sciences 1998

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