Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/3893
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dc.contributor.authorCastro, M. M. C. A.-
dc.contributor.authorGeraldes, C. F. G. C.-
dc.contributor.authorGameiro, P.-
dc.contributor.authorPereira, E.-
dc.contributor.authorCastro, B.-
dc.contributor.authorRangel, M.-
dc.date.accessioned2008-08-29T15:35:44Z-
dc.date.available2008-08-29T15:35:44Z-
dc.date.issued2000en_US
dc.identifier.citationJournal of Inorganic Biochemistry. 80:1-2 (2000) 177-179en_US
dc.identifier.urihttp://hdl.handle.net/10316/3893-
dc.description.abstractThe interaction of vanadate with the ligand 1,2-dimethyl-3-hydroxy-4-pyridinone (Hdmpp) was studied in aqueous solution using a combination of multinuclear NMR and EPR spectroscopies, as well as potentiometry and cyclic voltammetry. The different species in solution were identified and characterized, and their pKa values and stability constants determined. The vanadium complexes formed in solution are strongly dependent on media composition (ionic strength, presence of buffer), pH and metal-to-ligand ratio (M:L). Two major species -- V(V)/dmpp and V(V)/(dmpp)2 -- are formed in a 140 mM NaCl solution within the pH range 4.5 to 9.0, when M:L=1:2. In the presence of excess ligand (M:L<=1:5), only the 1:2 complex is present, and at pH<4 paramagnetic species are detected by EPR in solution, thus indicating a reducing capacity of the ligand. Cyclic voltammetry shows that redox processes in solution are not just electron transfer, but are accompanied by chemical reactions. The pKa values and stability constants were determined both by 51V NMR spectroscopy and potentiometry. The present results have a particular interest in the understanding of the aqueous solution chemistry in aerobic conditions of bis(1,2-dimethyl-3-hydroxy-4-pyridinonato) oxovanadium(IV) complex, VO(dmpp)2, a vanadium compound with potential insulin-mimetic properties.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TGG-40X8DKT-3C/1/3226f220763b348a4f3d74ae0fcd0e24en_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectVanadateen_US
dc.subject1,2-Dimethyl-3-hydroxy-4-pyridinoneen_US
dc.titleStructural study of the interaction of vanadate with the ligand 1,2-dimethyl-3-hydroxy-4-pyridinone (Hdmpp) in aqueous solutionen_US
dc.typearticleen_US
dc.identifier.doi10.1016/S0162-0134(00)00028-3-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextopen-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-6811-3878-
crisitem.author.orcid0000-0002-0837-8329-
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
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