A spectroscopic study of the interaction of the VO2+ cation with the two components of chondroitin sulfate
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The interaction of the vanadyl (IV) cation with N-acetyl-D-galactosamine, D-galactosamine, and D-glucuronic acid has been investigated by electron absorption spectroscopy at different mental to ligand ratios and pH values. In the case of D-glucuronic acid, a more detailed study was undertaken, using differential IR spectroscopy in solution. The results show that the cation interacts with the two nitrogenated molecules only at higher pH values, generating 2∶1 lig-and to metal complexes in which coordination occurs through two pairs of deprotonated OH groups of the rings. In the case of D-glucuronic acid, the IR-measurements allowed a wider insight into the structural characteristics of the complexes generated in acidic media. The involvement of the glycosidic oxygen atom in coordination, is suggested at pH=3.
Index EntriesVO2+/N-acetyl-D-galactosamine VO2+/D-galactosamine VO2+/D-glucuronic acid interactions infrared and electronic spectra coordination properties
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- 2.F. S. Parker,Applications of Infrared Spectroscopy in Biochemistry, Biology and Medicine, Adam Hilger London, 1971.Google Scholar
- 3.F. S. Parker,Applications of Infrared, Raman and Resonance Raman Spectroscopy in Biochemistry, Plenum, New York, 1983.Google Scholar
- 4.G. Urretavizcaya and E. J. BaranZ. Naturforsch. 42b, 1537 (1987).Google Scholar
- 7.E. J. Baran, inMetal Ions in Biological Systems, Vol. 31, 129 H. Sigel and A. Sigel, eds., Marcel Dekker, New York, 1995.Google Scholar
- 8.K. A. Connors,Binding Constants, Wiley, New York, 1981.Google Scholar
- 10.M. Branca, G. Micera, D. Sanna, A. Dessi, and H. Kozlowski,J. Chem. Soc. Dalton Transact. 1990, 1997.Google Scholar
- 11.K. Nakamoto,Infrared and Raman Spectra of Inorganic and Coordination Compounds, 3rd. Ed., Wiley, New York, 1978.Google Scholar
- 12.D. Lin-Vien, N. B. Colthup, W. G. Fateley, and J. G. Grasselli,The Handbook of Intrared and Raman Characteristic Frequencies of Organic Molecules, Academic, Boston, 1991.Google Scholar
- 13.K. Nakanishi,Infrared Absorption Spectroscopy, Practical, Nankodo, Tokyo, 1962.Google Scholar
- 14.C. G. Barraclough, D. C. Bradley, J. Lewis, and I. H. Thomas,J. Chem. Soc. 1961, 2601.Google Scholar