Collect. Czech. Chem. Commun. 1990, 55, 2944-2948

Kinetic investigation of the oxidation of bromide ions by cobalt(III). Reaction in the presence of p-toluic acid

Júlia Schlosserová, Milan Hronec and Václav Veselý

Faculty of Chemistry, Slovak Technical University, 812 37 Bratislava


The rate of Co(III) reduction under inert atmosphere in the presence of p-toluic acid (PTA) and hydrobromide obeys the rate law d[Co(III)]/dt = k[Co(III)]2 [Co(II)]-1 [PTA] [HBr]. The proposed reaction mechanism involves the reduction of Co(III) by Br- ions and formation of a cation-radical from p-toluic acid. p-Xylene is attacked by bromine species and not directly by Co(III). The rate constants of Co(III) and Br- consumption as well as apparent activation energies were estimated.