Spectrophotometric study of binary and ternary systems involving metal ions and benzylidenepyruvates: Equilibria in aqueous solutions

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dc.contributor.authorMelios, Cristo B. [UNESP]
dc.contributor.authorTorres, Vera R. [UNESP]
dc.contributor.authorMota, Márcia H. A. [UNESP]
dc.contributor.authorTognolli, Joãeo O. [UNESP]
dc.contributor.authorMolina, Manuel [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-26T23:08:10Z
dc.date.available2014-05-26T23:08:10Z
dc.date.issued1984-12-01
dc.description.abstractThe protonation of 4-dimethylaminobenzylidenepyruvate (DMBP) and 2-chloro-4-dimethylaminobenzylidenepyruvate (2-CI-DMBP) and their complex formation with Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pb(II), Cd(II) and Al(III) have been studied by potentiometric and spectrophotometric methods at 25 °C and ionic strength 0.500 M, held with sodium perchlorate. The stability order found for 1 :1 complexes of both ligands is Al(III) > Cu(II) > Pb(II) > Ni(II) > Zn(II) > Co(II) > Cd(II) > Mn(II). The stability changes move in the same direction as the pKa of the ligands. The results are compared with literature values reported for metal ion pyruvate systems. Thermodynamic stabilities of ternary complexes formed in Cu(II)-B-L- systems, where B = 2,2′-bipyridyl (bipy), ethylenediamine or glycinate and L = DMBP or 2-CI-DMBP, were also determined. The Cu(bipy)L+ species are more stable than would be expected on purely statistical grounds. The importance of the :t system associated with bipy on the enhanced stability of its mixed ligand complexes is stressed. Analytical applications of the investigated ligands are outlined.en
dc.description.affiliationInstitute de Quimica UNESP, Caixa Postal 174, Araraquara (SP) 14.800
dc.description.affiliationUnespInstitute de Quimica UNESP, Caixa Postal 174, Araraquara (SP) 14.800
dc.format.extent385-389
dc.identifierhttp://dx.doi.org/10.1039/AN9840900385
dc.identifier.citationThe Analyst, v. 109, n. 3, p. 385-389, 1984.
dc.identifier.doi10.1039/AN9840900385
dc.identifier.issn0003-2654
dc.identifier.scopus2-s2.0-0001037091
dc.identifier.urihttp://hdl.handle.net/11449/63684
dc.language.isoeng
dc.relation.ispartofThe Analyst
dc.relation.ispartofjcr3.864
dc.relation.ispartofsjr1,249
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBenzylidenepyruvates
dc.subjectBinary and ternary metal ion complexes
dc.subjectEquilibria
dc.subjectSpectrophotometry
dc.titleSpectrophotometric study of binary and ternary systems involving metal ions and benzylidenepyruvates: Equilibria in aqueous solutionsen
dc.typeArtigo
dcterms.licensehttp://www.rsc.org/AboutUs/Copyright/Authordeposition.asp
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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