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.