UNSPECIFIED (2000) Speciation in vanadium bioinorganic systems 6. Speciation study of aqueous peroxovanadates, including complexes with imidazole. In: 2nd Symposium on Biological Aspects of Vanadium, AUG 16-17, 1999, BERLIN, GERMANY.

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Abstract

Using a combination of potentiometry (glass electrode) and quantitative V-51 MMR spectroscopy, the full speciation in the vanadate-peroxide and vanadate-peroxide-imidazole systems was determined in the pH range 1-10 (0.150 M Na(CI) medium, 25 degrees C). Using the computer program LAKE, the pK(a) value of imidazole and the formation constants for 10 peroxovanadate species and also for three more species where a single imidazole moiety is also bound, have been calculated. The experimental data show a good fit to the calculated speciation model, even for the less abundant species. The species are either monomeric or dimeric in vanadium, and four resonances of the dimeric species have been unambiguously assigned via 2D V-51 NMR. Diperoxovanadates are the favoured species at pH 2-10, when sufficient peroxide is present. Imidazole: is found to bind strongly to them at pH 6-9. The equilibrium conditions are illustrated in distribution diagrams. (C) 2000 Elsevier Science Inc. All rights reserved.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	JOURNAL OF INORGANIC BIOCHEMISTRY
Publisher:	ELSEVIER SCIENCE INC
ISSN:	0162-0134
Date:	30 May 2000
Volume:	80
Number:	1-2
Number of Pages:	8
Page Range:	pp. 51-58
Publication Status:	Published
Title of Event:	2nd Symposium on Biological Aspects of Vanadium
Location of Event:	BERLIN, GERMANY
Date(s) of Event:	AUG 16-17, 1999
URI:	http://wrap.warwick.ac.uk/id/eprint/13258

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