Abstract
The kinetics of oxidation of [Cr(L)3(Cl)3]·2H2O (L = 2-aminobenzothiazole) by periodate in aqueous media were studied over pH 6.8–8.0, ionic strength 0.10–0.50 mol dm–3, and temperatures 20–40 °C for a range of complex and periodate concentrations. The reaction rate was first-order dependent on both reactants and increased with pH over the range studied. In aqueous media, the complex aquated to [Cr(L)3(H2O)3]3+. The deprotonated form, [Cr(L)3(H2O)2-(OH)]2+, was regarded as more reactive than its conjugate acid. The effect of Cu(II) and Fe(II) ions on the rate of oxidation was studied over (1.0–5.0) × 10–4 mol dm–3. The kinetics data indicate that the rate decreased as concentration of metal ions increased over the range studied. An inner-sphere mechanism is proposed for the oxidation pathways of both protonated and deprotonated CrIII-complex species.
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