Dissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes

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dc.contributor.authorTunçel M.
dc.contributor.authorSarı H.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2007
dc.departmentNiğde ÖHÜ
dc.description.abstractThe stoichiometry and stability constant of metal complexes with 4-(3-methoxy-salicylideneamino)-5-hydroxynaphthalene-2,7-disulfonic acid monosodium salt (H 2 L) and 4-(3-methoxysalicylideneamino)-5-hydroxy-6- (2,5-dichlorophenylazo)-2,7-naphthalene disulfonic acid monosodium salt (H 2 L 1 ) were studied by potentiometric titration. The stability constants of H 2 L and H 2 L 1 Schiff bases have been investigated by potentiometric titration and u.v.-vis spectroscopy in aqueous media. The dissociation constants of the ligand and the stability constants of the metal complexes were calculated pH-metrically at 25 °C and 0.1 m KCl ionic strength. The dissociation constants for H 2 L were obtained as 3.007, 7.620 and 9.564 and for H 2 L 1 , 4.000, 6.525, 9.473 and 10.423, respectively. The complexes were found to have the formulae [M(L) 2 ] for M = Co(II), Ni(II), Zn(II) and Cu(II). The stability of the complexes follows the sequence: Zn(II) < Co(II) < Cu(II) < Ni(II). The high stability of H 2 L 1 towards Cu(II) and Ni(II) over the other ions is remarkable, in particular over Cu(II), and may be of technological interest. Concentration distribution diagram of various species formed in solution was evaluated for ligands and complexes. The formation of the hydrogen bonds may cause this increased stability of ligands. The pH-metric data were used to find the stoichiometry, deprotonation and stability constants via the SUPERQUAD computer program. © 2007 Springer.
dc.identifier.doi10.1007/s11243-007-0259-6
dc.identifier.endpage810
dc.identifier.issn0340-4285
dc.identifier.issue6
dc.identifier.scopus2-s2.0-34547555870
dc.identifier.scopusqualityQ2
dc.identifier.startpage803
dc.identifier.urihttps://dx.doi.org/10.1007/s11243-007-0259-6
dc.identifier.urihttps://hdl.handle.net/11480/1235
dc.identifier.volume32
dc.identifier.wosWOS:000248624300020
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherSpringer Netherlands
dc.relation.ispartofTransition Metal Chemistry
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titleDissociation constants of some Schiff bases and stability constants of their copper, cobalt, nickel and zinc complexes
dc.typeArticle

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