Journal of the Chemical Society A Inorganic Physical Theoretical · 1971 · 27 citations · 0 references
Natural SciencesBiochemistryChemistryNuclear ChemistryRadiation PhysicsSpectroscopyGamma-ray SpectroscopyHyperfine StructureRadiation ChemistryRadical ReactionsHyperfine InteractionsOrganic Radical SpectroscopyRadiation DamageRadiation Damage EffectsRadiation-induced Free RadicalsRadiation-induced Reaction Mechanisms
At 300 K, both urea and formamide, on exposure to 60Co γ-rays, gave e.s.r. spectra characteristic of CONH2 radicals. The 13C hyperfine coupling confirmed that this is a σ radical, having a high spin-density on carbon. At 77 K urea gave a spectrum characteristic of the π radical H2NCONH, having a high spin-density on nitrogen. Possible mechanisms for radiation damage are outlined.