Abstract Photolytic homolysis of the alkyl cobalt 'salophens'(10),(20 a) and (20 b) in the presence of radical trapping agents eg. O 2, TEMPO, NO, SO 2, PhSSPh, PhSeSePh, MeSO 2 Cl, BrCCl 3 and I 2, leading to oxygen, nitrogen, sulphur, selenium and halogen ...