Ruthenium (III) catalyzed oxidation of hexamine by alkaline permanganate: A kinetic and mechanistic approach
The kinetics of Ruthenium (III) (Ru(III)) catalyzed oxidation of hexamine by permanganate in alkaline medium at constant ionic strength (0.80mol dm-3) has been studied spectrophotometrically. The reaction between hexamine and [MnO4-] in 1:2 stoichiometry [Hexamine: MnO4-]. The reaction showed first order kinetics in permanganate concentration and apparent less than unit order dependence in hexamine and inverse fractional order in alkali concentrations and unit order dependence on catalyst (Ru(III)). Effect of added products, ionic strength and dielectric constant of the reaction medium have been investigated. The main products were identified by spot test and IR studies. A mechanism involving the formation of a complex between hexamine and permanganate has been proposed. The active species of oxidant is [MnO4-]. The reaction constants involved in the mechanism were evaluated. The activation parameters were computed with respect to the slow step of the mechanism and discussed.
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