A detailed analysis of the electron spin resonance spectrum for the potassium salt of m-dinitrobenzene negative ion in DME is presented. Isotopic substitution has been performed in various positions in the molecule. m-Dinitrobenzene negative ion exhibits only one nitrogen hyperfine interaction of 9.0 gauss, and possesses proton hyperfine interactions of 4.6 gauss for the number 2, 4, and 6 protons and 1.2 gauss for the number 5 proton. The hyperfine spectrum is different for each of the alkali metals, Li, Na, K, Rb, and Cs, but still retains only one nitrogen hyperfine interaction. An enriched Li6 metal salt of m-dinitrobenzene indicates no alkali metal hyperfine interaction.
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Raymond L. Ward (1960) studied this question.
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