Apparent rates of hydrolysis of 2, 4-dinitrochlorobezene (DNCB) catalyzed by nine cationic surfactants were determined and the thermodynamic parameters of activation were calculated. The results indicate that: (1) The free energies of activation, ΔG≠ , for hydrolysis of DNCB in the solutions of cationic surfactants are lower than those in water. (2) The enthalpies of activation, ΔH≠ , and the entropies of activation, AS5"6 are reduced by the cationic micelles. (3) The entropies of activation, ΔS≠ , are negative, which is favorable for the presence of more stable activation complex. (4) The rates of hydrolysis of DNCB is decided byΔG≠. The compensation effect of enthalpy-entropy has been envisaged.

Key words: SURFACTANTS, CHLOROBENZENE P, NITROBENZENE P, HYDROLYSIS, ACTIVATION ENERGY, THERMODYNAMIC PROPERTIES