Unstable intermediates. Part CXXXIV. Electron spin resonance studies of positive hole centres in γ-irradiated glycine

Abstract

Single crystals and powders of α-glycine, N-deuterioglycine, and C-deuterioglycine have been exposed to ⁶⁰Co γ-rays at 77 K, and their e.s.r. spectra studied as a function of annealing temperature. Initial radical products comprised H₃NH₂ĊCO₂^2–, H₂⁺NCH₂CO₂^–, and H₃N–ĊH₂. On annealing, H₃NH₂ĊO₂^2– gave H₂ĊCO₂^– radicals, H₂⁺NCH₂CO₂^– probably gave H₃NĊHCO₂^– radicals, whilst H₃N–ĊH₂ gave H₂NĊH₂. On further annealing intermolecular attack gave mainly H₃NĊHCO₂^– radicals.