EFFECT OF POLYMER ADDITIVES ON MAGNETIC MODULATION OF THE YIELD OF PRODUCTS OF RECOMBINATION OF TRIPLET RADICAL-ION PAIRS IN ELECTRON PHOTOTRANSFER BETWEEN N,N-DIMETHYLANILINE AND PYRENE .2. POLY-N-TERT-BUTYLACRYLAMIDE IN METHANOL

The effect of a magnetic field on the intensity of delayed fluorescenc e of pyrene excimers formed during evolution of pyrene - N, N-dimethyl aniline radical ion pairs (RIP) in methanol containing glycerol or pol y-N-tert-butylacrylamide was comparatively investigated by laser strob e fluorometry. Different methods of restricting the molecular mobility of the reagents cause different values of the magnetic effect with th e same microviscosity measured with the spin probe orientational corre lation time. This result contradicts the data obtained previously for mixtures with polyacrylamide and can be explained with the data on cro ss-linking of the polymer-containing solution. The viscosity of the mi croenvironment of the RIP partners is approximately 10 times higher th an the viscosity of the solvent. The presence of a maximum on the curv e of the change in the magnetic effect in restriction of the molecular mobility was attributed to an increase in the lifetime of the radical pair and a change in the ratio of the relaxation rates and yield of r adicals in bulk.