The kinetics of Tl(III) acetate oxidation of 1,3,5-triaryl formazan has been studied in 90% aqueous HOAc, in the presence of added anionic detergent, sodium-lauryl sulphate(NaLS) and cationic detergent, cetyltrimethylammonium bromide (ctab). Both surfactants enhance the reaction rate, indicating that the reactive species involved is possibly neutral. From the substituent influence observed in the micellar phase Hammett correlations have been attempted. Higher negative ϱ values obtained in the presence of ctab, indicate that the transition state is more electron-deficient. The positive co-operativity calculated for the micellar catalysed reactions (3.0) indicates possible hydrophobic interaction between micelle and formazan.
Volume 134, 2022
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