Abstract
Quinolinium dichromate (QDC) oxidation of TlI in aqueous AcOH containing large concentrations of HCl is considerably accelerated both by H+ and Cl− ions as well as by increasing the AcOH concentration in the medium; oxidation is made possible by altering the redox potentials. The reaction is first order in oxidant and in reductant but apparently less than unit order in [Cl−] and nearly second order in [H+]. The active species of QDC and TlI are ClCrO3− and TlCl2− respectively. A possible mechanism is proposed and verified, and the reaction constants involved have been evaluated.
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