Some thermodynamic and kinetic aspects of the reactions of dioxygen binding to Co(II) complexes with the two cyclic tetraamines 1,4,7,10-tetraazacyclododecane (aneN(4)) and 1,4,8,11-tetraazacyclotridecane (aneN(4)) are examined. Specifically, results are reported on: (1) the determination of the protonation constants and protonation enthalpies for both aneN(4) and aneN(4) ligands; (2) the study of the kinetics of the formation of the precursor CoL complexes for L = aneN(4) and aneN(4) carried out by monitoring the uptake rate of molecular dioxygen; (3) the recognition of the type of dioxygen adducts formed at various pH values; (4) the determination of the kinetic and thermodynamic data characterising the reactions of isomerization of monobridged mu-peroxo-monohydroxo (CoL)(2)(mu-O(2))(OH) complexes into the dibridged mu-peroxo-mu-hydroxo (CoL)(2)(mu-O(2))(mu-OH) complexes, and the reactions of conversion of the dibridged mu-peroxo-mu-hydroxo (CoL)(2)(mu-O(2))(mu-OH) complexes into the monobridged mu-peroxo-dihydroxo (CoL)(2)(mu-O(2))(OH)(2) complexes. (C) 1999 Elsevier Science Ltd. All rights reserved.
|Autori:||CABANI S.; CECCANTI N.; PARDINI R.; TINE' M|
|Titolo:||Thermodynamics and Kinetics of Dioxygen Binding to Co(II) Complexes with Saturated Macrocyclic Tetramines|
|Anno del prodotto:||1999|
|Digital Object Identifier (DOI):||10.1016/S0277-5387(99)00267-3|
|Appare nelle tipologie:||1.1 Articolo in rivista|