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dc.contributor.authorMarques, R. N.-
dc.contributor.authorMelios, C. B.-
dc.contributor.authorPereira, N. C. S.-
dc.contributor.authorSiqueira, O. S.-
dc.contributor.authorDe Moraes, M.-
dc.contributor.authorMolina, M.-
dc.contributor.authorIonashiro, M.-
dc.identifier.citationJournal of Alloys and Compounds, v. 249, n. 1-2, p. 102-105, 1997.-
dc.description.abstractThe protonation constants of 4-methylbenzylidenepyruvate (4Me-BP) and 4-isopropylbenzylidenepyruvate (4IP-BP) as well as the stability constants of their binary 1:1 complexes with Cu(II), La(III), Pr(III), Sm(III), Eu(III), Yb(III), Sc(III) and Th(IV) have been determined spectrophotometrically in aqueous solution at 25°C and ionic strength 0.500 M, maintained with sodium perchlorate. For all metal ions considered, the stability changes move in the same direction as the pKa of the ligands. Linear free energy relationships, as applied to oxygen donor substances, suggest the -COCOO- moiety as the metal binding site of the ligands. The results are discussed mainly taking into account that benzylidenepyruvates, besides the α-keto canonical form, may display other forms in aqueous solution with changing pH and the possible occurrence of extra intra-ligand charge polarization, induced by metal ions.en
dc.subjectMetal-ion complexesen
dc.titleComplexation of some trivalent lanthanides, scandium(III) and thorium(IV) by benzylidenepyruvates in aqueous solutionen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade Federal de Mato Grosso do Sul (UFMS)-
dc.contributor.institutionUniversidade Federal do Maranhão (UFMA)-
dc.description.affiliationInstituto de Química-UNESP, Caixa Postal 355, 14801-970 Araraquara (SP)-
dc.description.affiliationDepto. de Química-UFMS, Caixa Postal 649, 79070-900 Campo Grande (MS)-
dc.description.affiliationDepto. de Química Centro Tecnológico UFMA, 65080-040 Sǎo Luis (MA)-
dc.description.affiliationUnespInstituto de Química-UNESP, Caixa Postal 355, 14801-970 Araraquara (SP)-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Alloys and Compounds-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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