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.
H. Bower, J. McRae and M. C. R. Symons, J. Chem. Soc. A, 1971, 2400 DOI: 10.1039/J19710002400
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