Abstract
The kinetics of oxidation of [CrIII(atda)(H2O)2] (atda = anthranil-N,N-diacetato) complex by IO 4 − was studied spectrophotometrically in aqueous solutions with pH range 2.20–3.34, 0.30 M ionic strength and in 20.0–40.0°C temperature range. The rate law of the reaction exhibited saturation kinetics. Values of the rate constant for the electron transfer process, the equilibrium constant for dissociation of [CrIII (atda)(H2O)2] to [CrIII (atda) (H2O)OH]+ + H+ and the pre-equilibrium formation constant were calculated. The thermodynamic activation parameters are reported. It is proposed that electron transfer proceeds through an inner-sphere mechanism via coordination of the IVII to chromium(III).
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