Abstract
1H CIDNP has been observed following the photolysis of two coenzyme B12 model compounds, ethyl[N,N‘-ethylenebis(salicylideneaminato)]cobalt(III) and benzylaquocobaloxime. Polarization of the alkyl groups attached through a carbon atom to the cobalt(III) metal center has been observed and is consistent with photohomolysis of the C−Co bond to generate a singlet radical pair. The analysis of CIDNP effects clarifies the apparent contradiction between the CIDEP and magnetic field effect studies reported previously.
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