Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/21304
Título: Kinetic study of dissociation of a copper(II) complex of a 14-membered tetraaza-macrocyclic ligand containing pyridine and pendant N-carboxymethyl arms
Autor: Lubal, Premysl
Albrecht-Gary, Anne-Marie
Blanc, Sylvie
Costa, Judite
Delgado, Rita
Palavras-chave: Chemistry, Multidisciplinary
Data: 2008
Editora: INST ORGANIC CHEM AND BIOCHEM
Citação: COLLECTION OF CZECHOSLOVAK CHEMICAL COMMUNICATIONS. - Vol. 73, n. 2 (2008), p. 258-274
Resumo: The kinetics of acid-catalyzed dissociation of the copper(II) complex with 7-methyl-3,7,11,17-tetraazabicyclo[11.3.1] heptadeca-1(17), 13,15-triene-3,11-diacetic acid (ac(2)Me[14] pyN(4)) at [H+] = 0.05-0.25 mol l(-1), I = 0.25 mol l(-1) (Na, H) ClO4, and T = 298.16 K was studied with conventional and stopped-flow UV/VIS spectroscopy. Three steps of consecutive complex reaction were observed. The very fast first and second steps characterized by k(1) = 70 +/- 10 and k(2) = 0.23 +/- 0.01 l mol(-1) s(-1) depend on the H+ concentration. The third step is very slow, k(3) = (1.08 +/- 0.03) x 10(-3) s(-1), and does not depend on the H+ concentration. Latter rate-determining step involves an isomerisation process forcing the copper(II) ion to leave rapidly the macrocyclic cavity. The reaction mechanism of the complex dissociation has been proposed, taking into account the results obtained for related systems by independent methods: potentiometry, UV/VIS and EPR spectroscopies, X-ray diffraction analysis, and molecular mechanics calculations.
URI: http://hdl.handle.net/10451/21304
DOI: http://dx.doi.org/10.1135/cccc20080258
ISSN: 0010-0765
Aparece nas colecções:FF - Produção Científica 2000-2009

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