307-310The
oxidation of TI(I) by pyridinium chlorochromate has been studied in 2.0 mol dm-3
hydrochloric acid. The reaction exhibits total second order kinetics, first order
in each reactant and it is catalysed by hydrogen and chloride ions. The active species
have been found to be protonated pyridinium chlorochromate of the oxidant and
TICl2- of the reductant respectively. Added products, TI(III)
, and Mn(II) have no significant effect on the reaction. The protonation
constant of the pyridinium chlorochromate has also been evaluated as 8.0×10-2
dm3 mol-1 from the [H+] dependence of the
reaction. A plausible mechanism is proposed based on the experimental
observations