Good-quality powder ENDOR spectra have been obtained at room temperature for a variety of organic π-radicals containing β-protons. For some species, rotation of methyl groups, which modulates the isotropic hyperfine interaction and drives electron–nuclear ‘flip-flop’ relaxation, shows up very clearly through the strong dependence of the ENDOR intensity on the part of the e.s.r. spectrum which is monitored.
N. M. Atherton and C. E. Oliver, J. Chem. Soc., Faraday Trans. 1, 1988, 84, 3257 DOI: 10.1039/F19888403257
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