TEMPERATURE-DEPENDENCE OF THE BENZOPHENONE ANION SOLVATION IN 1-PROPANOL

The solvation of the benzophenone anion in n-propanol over the tempera ture range -20 to -50 degrees C was determined from the shift of the b enzophenone anion absorption spectrum as a function of time. The anion spectra were the same as those determined at room temperature. The fo rm of the kinetics is the same; the results at the different wavelengt hs are uniformly slower at lower temperatures. The activation energy f or the anion solvation is approximately 22 kJ/mol. This value is great er than the value determined for dipole solvation so that, while benzo phenone anion solvation is faster than excited state solvation at room temperatures, it is slower at lower temperatures.