High-resolution electron spin resonance spectra have been obtained for free radicals produced from methyl, ethyl, and benzyl viologen and 4–4′-bipyridyl in ethanol—water solutions by irradiation with sunlight. From the analysis of these spectra we find that the hyperfine splittings for the protons ortho and meta to the nitrogen atoms are almost equal. The spin density distributions are discussed in terms of McLachlan's approximate SCF theory and we conclude that |QNHH|≈|QN CH3H|≈25.
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Johnson et al. (1963) studied this question.
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