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 ([12]aneN(4)) and 1,4,8,11-tetraazacyclotridecane ([13]aneN(4)) are examined. Specifically, results are reported on: (1) the determination of the protonation constants and protonation enthalpies for both [12]aneN(4) and [13]aneN(4) ligands; (2) the study of the kinetics of the formation of the precursor CoL complexes for L = [12]aneN(4) and [13]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.

Thermodynamics and Kinetics of Dioxygen Binding to Co(II) Complexes with Saturated Macrocyclic Tetramines

CABANI, SERGIO;CECCANTI, NORBERTO;TINE', MARIA ROSARIA
1999-01-01

Abstract

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 ([12]aneN(4)) and 1,4,8,11-tetraazacyclotridecane ([13]aneN(4)) are examined. Specifically, results are reported on: (1) the determination of the protonation constants and protonation enthalpies for both [12]aneN(4) and [13]aneN(4) ligands; (2) the study of the kinetics of the formation of the precursor CoL complexes for L = [12]aneN(4) and [13]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.
1999
Cabani, Sergio; Ceccanti, Norberto; Pardini, R.; Tine', MARIA ROSARIA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/165254
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