MARY AND OPTICALLY DETECTED ESR SPECTROSCOPY OF RADICAL CATIONS OF CIS-DECALIN AND TRANS-DECALIN IN NONPOLAR SOLUTIONS

Optically detected ESR and magnetic field effect on recombination lumi nescence yield (MARY) spectroscopy of spin-correlated radical ion pair s were used to study cis- and trans-decalin radical cations in nonpola r solutions. The differences observed in cis- and trans-decalin spectr a are demonstrated to agree with the existence of temperature-activate d intramolecular dynamic transitions in trans-decalin radical cation. In diluted solutions with decalin added as accepters, the MARY spectro scopy technique yields the spectra of the corresponding radical cation s even at room temperature. Under these conditions, the fast limit of dynamic transitions in trans-decalin radical cation takes place. It is demonstrated that both cis- and trans-decalin radical cations take pa rt in ion-molecular charge transfer to a neutral molecule, the rate co nstant being close to the diffusion-controlled one.