COMPARISON OF E(A) VALUES OBTAINED BY THERMAL-ANALYSIS WITH ENERGY OFCHARGE-TRANSFER SPECTRA FOR POTASSIUM AND SILVER PERMANGANATES

The activation energy, E(a) taken from the thermal decomposition of KM nO4 and AgMnO4 was compared with the energy of the longest wavelength O-->Mn 'charge transfer' (CT) transition. The E(a) and CT correlation was found in these systems. However, such relationship can be valid wh en in the dissociation process the electron transfer is assumed to be the rate determining step. Thus, the permanganates as well as the prev iously studied chromates, are positive examples showing that in some c ases, the energies derived from both methods can be comparable.