Kinetics and Mechanism of the Reduction of Dihydroxydiperiodatoargentate(III) by 1,2-butylene Glycol in Alkaline Medium

Kinetics and mechanism of the reduction of dihydroxydiperiodatoargentate(III) by 1,2-butanediol in alkaline medium were studied by spectrophotometry in the 298.2–318.2 K range. The reaction rate showed pseudo-first order dependence in oxidant and 1 < n_ap< 2 in reductant. The associated rate law is: -dAg(III)]_t/dt = { kK₁K₂K₃CH₃CH₂CHOHCH₂OH]² Ag(III)]_t/H₂IO^3-₄]OH^-]+K₁K₂+K₁K₂K₃CH₃CH₂CHOHCH₂OH] = k.Ag(III)]_t. A plausible mechanism involving a pre-equilibrium of adduct formation between the complex and reductant was proposed. The activation parameters along with rate constants of the rate-determining step were calculated.