Abstract: The kinetics of oxidation of iso-propyl amine(PA) by diperiodatocuprate(Ⅲ)complex ion was studied by spectrophotometry in alkaline medium in the temperature range of30～45℃ The reaction rate showed the first order dependence in oxidant, and 1.15-1.39order dependence in PA.It reveals that the pseudo first-order ([PA]₀>[Cu (Ⅲ)₀]) rateconstant, k_obs, decreases with the increase in [OH^-] and the increase in [IO₄]_cx(KIO₄] addedexternally), which implicates that before the rate-determining step there is a pre-equilibriumin which one of the two periodate ligands of the oxidant is dissociated after the protonation toform a reactive monoperiodatocuprate (Ⅲ) ion.Under the protection of nitrogen the reactionsystem Induced the polymerization of acrylamide indicating the participation of free radicals.Anegative salt effect on rate was observed.Based on the observations a mechanism involving a pre-equilibration and an adduct formation between [Cu(HIO₆)]^- and PAwasproposed.The rate equation derived from the mechanism could be used to explain all the theexperimental observations and the pre-equilibration constants, rate constants of the rate-determining step together with the activation parameters were evaluated.

Key words: Diperiodatocuprate(Ⅲ), iso-Propyl amine, Redox reaction, Kinetics and mechanism