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
Aa. Vedeneev et al., 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, Bulletin of the Russian Academy of Sciences, Division of Chemical Sciences, 41(9), 1992, pp. 1603-1608
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.