Solvent effect on alkaline fading of crystal violet in pure and aqueous mixtures of alcohols

Chemical kinetics of alkaline fading of crystal violet has been studied in aqueous mixtures of methanol, ethanol, isopropanol and t-butanol by measuring the specific rate constant of the reactions spect rophotometrically in these solvent systems. The kinetic solvent effect has been analyzed in the light of Gibb's free energies of transfer of reactants and transition states from water to aqueous mixtures of alcohols, derived thereof. The observed variation of transfer free energy parameters, characteristic of the S N 2 reaction, with cosoivent compositions have been interpreted In terms of various specific and non-specific interactions of media with the reacting species and the transitions state Involved in this reaction.