ANOMALOUS MAGNETIC EFFECTS - THE ROLE OF ASSOCIATION IN THE RECOMBINATION OF SINGLET RADICAL PAIRS IN LIQUIDS

The magnetic field effects (MFEs) reported earlier on the recombination products ratio in the reactions of benzyl chloride with triethylgermylsodium (triethylgermylpotassium) have been analyzed. The experimentally observed MFEs prove to be much larger than those calculated under the assumption of a free diffusive radical pair motion. A model involving the associated radical pair (RP) state is proposed to explain the MFEs in the reactions studied. The calculations performed within the framework of the exponential model with a nuclear spin I = 1/2 provide for a quantitative description of the experimentally observed MFE field dependences. The comparison of the experimental and calculated results shows that the experimental product yield ratio field dependences most probably correspond to the situation of a relatively short-lived (lifetime congruent-to 1 ns) associated RP state with a small effective exchange interaction.