THE INFLUENCE OF THE STATIC PERMITTIVITY OF A SOLVENT ON THE MAGNITUDE OF MAGNETIC-FIELD EFFECTS IN THE RECOMBINATION OF TRIPLET RADICAL-ION PAIRS IN PHOTOINDUCED ELECTRON-TRANSFER REACTIONS
Nl. Lavrik, THE INFLUENCE OF THE STATIC PERMITTIVITY OF A SOLVENT ON THE MAGNITUDE OF MAGNETIC-FIELD EFFECTS IN THE RECOMBINATION OF TRIPLET RADICAL-ION PAIRS IN PHOTOINDUCED ELECTRON-TRANSFER REACTIONS, High energy chemistry, 28(5), 1994, pp. 363-367
The dependence of the effect of magnetic field on the dielectric const
ant epsilon was studied for the reactions of photoinduced electron tra
nsfer in the pyrene-N,N-diethylaniline system. It was shown that the t
ime dependence of the magnetic effect changes considerably with varyin
g epsilon: for a time longer than 0.5 mu s, the magnitude of the magne
tic effect decreases with time after photoexcitation of the system or
is almost constant at epsilon < 100 or epsilon > 100, respectively. Co
ntinuous measurements show that the magnetic effect increases monotoni
cally with an increase in epsilon and reaches a value close to the gre
atest possible value at epsilon = 190. The observed changes in the mag
netic effect are explained in the framework of a qualitative hypothesi
s on the predominate decay of homogeneous radical ion pairs on increas
ing the dielectric permittivity of the medium.