EFFECT OF TEMPERATURE ON THE DYNAMICS OF BENZOPHENONE ANION SOLVATIONIN ALCOHOL

The solvation of the benzophenone anion in 1-propanol, 2-propanol, and 1-butanol has been measured over the temperature range -10 to -50 deg rees C. The initial spectra of the benzophenone anion were very simila r in all three alcohols. The final spectrum of the benzophenone anion in 2-propanol is less blue-shifted (17 nm) than the spectrum of the an ion in 1-propanol and 1-butanol. The activation energies for solvation are 22 kJ/mol for 1 propanol and 1-butanol and 16 kJ/mol for 2-propan ol, which are similar to the energy for hydrogen bond breakage in the pure solvents. This suggests that the solvent H-bond breakage plays an important role in anion solvation.