Charge transfer complexes of anilines-DDQ: A kinetic study

The kinetics of transformation of charge transfer complexes of anilines-DDQ has been studied spectrophotometrically by stabilising the complexes in CC l4, a low polar solvent, at low temperatures and under low donor concentrat ions. The decay of CT complexes has been followed by decrease in the absorb ance of CT band and it has been found to follow pseudo first order kinetics . The stability constants of the complexes have been determined from kineti c studies, using the method described by Rappoport. A linear relationship i s observed between logarithmic functions of stability constants and Hammett sigma constants. Thermodynamic parameters of the complexes have been evalu ated from temperature variation of stability constant.