Alternating Linewidths and Related Phenomena in the Electron Spin Resonance Spectra of Nitro‐Substituted Benzene Anions

Studies of linewidths in the electron spin resonance spectra of a number of nitro‐substituted benzene anions are reported. The radicals were generated electrolytically in N,N‐dimethylformamide solutions, and spectra were obtained over a range from above to below room temperature. Pronounced alternations in the linewidths of the nitrogen lines in many of the spectra were observed. If MN is the total z component of the nuclear spin angular momentum in compounds containing two equivalent nitrogen nuclei, the alternating linewidth phenomenon causes a broadening of the lines for which MN=±1 and a reduction in the amplitude of the central line. Large alternating linewidths were observed in the room‐temperature spectra of the anions of dinitrodurene, dinitromesitylene, and 2,6‐dinitro‐3,5‐dimethyl‐4‐acetyl‐t‐butylbenzene; and also in a spectrum which shows splittings from two equivalent nitrogen nuclei that was obtained from trinitromesitylene. Slight alternating linewidth effects at room temperature that became...

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