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The interaction of the vanadyl (IV) cation with chondroitin sulfate A
S B Etcheverry1, P A Williams, E J Baran
1Química Inorgánica (QUINOR), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Argentina.
Abstract:
The interaction of VO2+ with the muchopolysaccharide chondroitin sulfate A (CSA) has been investigated by electron absorption spectroscopy and infrared measurements in aqueous solutions at different pH-values and ligand to metal ratios up to 6:1. The generation of a VO(CSA)2 species could be demonstrated. Coordination of the oxocation through the carboxylate group and the glycosidic oxygen of the D-glucuronate moieties is suggested. Infrared spectra of some poorly characterized solid VO/CSA complexes point to the same bonding characteristics. Preliminary results obtained at higher ligand to metal ratios suggest a different coordination behavior.