Abstract
The formation of radical pairs with a dipole—dipole splitting constant D = 12.2 ± 0.2 mT upon photolysis of single crystals of 2,6-di-tert-butyl-4-methylphenol doped with 10 −3 M 2,6-di-tert-butyl-1-imino- p-quinone was studied by EPR spectroscopy in the temperature range between 77 and 140 K. The mechanism of the formation of the radical pairs is discussed in terms of a hydrogen-atom phototransfer from the phenol to the iminoquinone.
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