title: One- versus two-electron oxidation with peroxomonosulfate ion: reactions with iron(II), vanadium(IV), halide ions, and photoreaction with cerium(III).
abstract: The kinetics of the redox reactions of the peroxomonosulfate ion (HSO(5)(-)) with iron(II), vanadium(IV), cerium(III), chloride, bromide, and iodide ions were studied. Cerium(III) is only oxidized upon illumination by UV light and cerium(IV) is produced in a photoreaction with a quantum yield of 0.33 +/- 0.03. Iron(II) and vanadium(IV) are most probably oxidized through one-electron transfer producing sulfate ion radicals as intermediates. The halide ions are oxidized in a formally two-electron process, which most likely includes oxygen-atom transfer. Comparison with literature data suggests that the activation entropies might be used as indicators distinguishing between heterolytic and homolytic cleavage of the peroxo bond in the redox reactions of HSO(5)(-).
authors.affiliation: University of Debrecen, Department of Inorganic and Analytical Chemistry, Debrecen 10, POB 21, Hungary, H-4010. lenteg@delfin.unideb.hu
authors.forename: Gábor
authors.initials: G
authors.lastname: Lente
authors.forename: József
authors.initials: J
authors.lastname: Kalmár
authors.forename: Zsuzsa
authors.initials: Z
authors.lastname: Baranyai
authors.forename: Alíz
authors.initials: A
authors.lastname: Kun
authors.forename: Ildikó
authors.initials: I
authors.lastname: Kék
authors.forename: Dávid
authors.initials: D
authors.lastname: Bajusz
authors.forename: Marcell
authors.initials: M
authors.lastname: Takács
authors.forename: Lilla
authors.initials: L
authors.lastname: Veres
authors.forename: István
authors.initials: I
authors.lastname: Fábián