ESR study of oxidation product in irradiated α-amino acids: Nitrogen centered π radical in α-glycine

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Abstract
The structure of the oxidation product H2Ṅ+CH2CO2 − in irradiated α‐glycine has been studied based on the hyperfine coupling tensors which have been determined at 4.2°K by single crystalESR measurements. It has been found that the radical initially possesses a nearly planar structure at the nitrogen atom with a framework similar to that of the undamaged molecule and then changes its conformation into the form previously found by Sinclair. The principal axes of the nitrogen coupling tensor suggest that the selective proton or hydrogen atom transfer from the NH3 + group takes place across the shortest hydrogen bond forming the radical.