Study of The Rates of Reaction between ß-Monobromopropionate and Thiosulphate Ions in Isodielectric Media of Aqueous n-Propanol

The second order rate constants (k) for the reaction between ß-substituted bromopropionate and thiosulphate ions in isodielectric media of n-propanol-water mixtures have been determined from 283 to 333 K. Efforts have been made to calculate the radii of the activated complex for single sphere (r•), and double sphere (rAB) models from the linear plots of logarithm of rate constant at zero ionic strength (log ko) against reverse of the dielectric constant (I/ ). Formation of single sphere activated complex has been discussed. Activation parameters regarding the activated complex like activation energy (E), change in enthalpy ( H•), change in entropy ( S •), and change in free energy of activation ( G•) have also been evaluated.