Zero-Field Electron Magnetic Resonance of Irradiated Glycine Peptides

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Abstract
Details of the hyperfine interaction between the unpaired electron and nearby nuclei in irradiated glycine peptides are elucidated by means of the technique of zero-field electron magnetic resonance. In acetyl-glycine and glycylglycine the zero-field spectra are interpreted in terms of a 2 radical model. Removal of one of the methylene protons, on the a-carbon near the carboxyl group, creates one radical and removal of the other methylene proton yields the other radical. The zero-field spectra of samples of glycylglycine hydrochloride and glycylglycylglycine were also measured. In all cases the damage was located on the a carbon nearest the carboxyl group. Interpretation in terms of a one proton interaction (for each radical) was possible for acetylglycine and glycyl-glycine. Hyperfine interactions with 2 protons had to be considered for glycylglycine hydrochloride and glycylglycylglycine.

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