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Kinetic Evidence for the Redox Cycling of Manganese(II,III) in the Presence of (1-)ON(NO)SO3(1-) in Aqueous Media

DOI: 10.1039/DT9950000293

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 293 - 300 (1995)

Update date:2022-09-26

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Authors:

Prinsloo, Frans F.Prinsloo, Frans F.

Pienaar, Jakobus J.Pienaar, Jakobus J.

Eldik, Rudi vanEldik, Rudi van

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Article abstract of DOI:10.1039/DT9950000293

Redox cycling of Mn(II/III) in the presence of (1-)ON(NO)SO3(1-) in the absence and presence of oxygen was studied by following the increase and decrease of Mn(III) spectrophotometrically as a function of <(1-)ON(NO)SO3(1-)>, , and pH.The autoxidation reaction exhibits typical autocatalytic behaviour in which the induction period depends on the concentrations of M(III) and (1-)ON(NO)SO3(1-).Under acidic conditions the reaction does not take place in the absence of Mn(III) or O2.The concentrations of O2, Mn(II) and (1-)ON(NO)SO3(1-) determine whether only oxidation of Mn(II) to Mn(III), or reduction of Mn(III) to Mn(II), or both in one or two redox cycles is observed.Preliminary simulations of some of the observed kinetic traces are presented.

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