ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Kinetics of the Reduction of Tetraaza Macrocyclic Complex Cu(TAAB)^2* by Glutathione

J. Labuda, M. Vaníčková, V. V. Pavlishchuk, and A. G. Kolchinskii

department of Analytical Chemistry, Faculty of Chemical Technology, Slovak Technical University, SK-812 37 Bratislava

Abstract: The reduction of a copper(II) complex with the macrocyclic ligand tetrabenzo[b,f,j,n]-[1,5,9,13]-tetraazacyclohexadecine by glutathione in aqueous solution has been investigated spectrophotometrically in both anaerobic and aerobic conditions. The reaction rate is first-order with respect to the concentration of reactants. According to the values of activation parameters and the course of spectral change during the reaction, an outer-sphere redox mechanism has been suggested. The copper complex initiates the catalytic oxidation of glutathione by dioxygen. The results are compared with the catalytic effect of Cu(TAAB)²⁺ at the oxidation of ascorbic acid and hydroxylamine.

Full paper in Portable Document Format: 482a78.pdf

Chemical Papers 48 (2) 78–81 (1994)