Copper and cobalt complexes of octadentate azamacrocycles: Spectrophotometric titration, stopped-flow kinetics and crystallographic study

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dc.contributor.authorOzay, Hava
dc.contributor.authorBaran, Yakup
dc.contributor.authorIshii, Youichi
dc.date.accessioned2025-01-27T18:55:54Z
dc.date.available2025-01-27T18:55:54Z
dc.date.issued2011
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractDetails of complex formation kinetics are reported for tetrakis(2- hydroxyethyl) substituted cyclen (L 1) and cyclam (L 2) with Cu(II) and Co(II). Stopped-flow kinetics and spectroscopic titration methods were employed for the activation parameters and stability constants, respectively. X-ray studies revealed that the pendant 2-hydroxyethyl groups are not equivalent: two are folded over the macrocycle and maintained by intramolecular hydrogen bonds while the others are extended and pointed away from the macrocyclic cavity. Complex formation kinetics and spectroscopic titration were performed in aqueous acidic buffer solutions. Thermodynamic and kinetic parameters revealed that the ring size of the macrocycles plays an extremely important role for each metal ion studied. Stopped-flow kinetic measurements explained the mechanism of the complex formation process of both Cu(II) and Co(II) which proceed in outer-sphere interactions with ligands. There are two steps in the complex formation of the system studied. The initial step is a second order reaction between the metal ion and macrocycle with a second order rate constant. © 2011 Elsevier B.V.
dc.description.sponsorshipTürkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK
dc.identifier.doi10.1016/j.saa.2011.08.078
dc.identifier.endpage531
dc.identifier.issn1386-1425
dc.identifier.issue1
dc.identifier.pmid21945125
dc.identifier.scopus2-s2.0-80054039860
dc.identifier.scopusqualityQ1
dc.identifier.startpage525
dc.identifier.urihttps://doi.org/10.1016/j.saa.2011.08.078
dc.identifier.urihttps://hdl.handle.net/20.500.12428/12748
dc.identifier.volume83
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.relation.ispartofSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_Scopus_20250125
dc.subjectComplexation; Kinetics; Pendant arm; Stability constants; Stopped-flow
dc.titleCopper and cobalt complexes of octadentate azamacrocycles: Spectrophotometric titration, stopped-flow kinetics and crystallographic study
dc.typeArticle

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