ESR spectra of the radical anions of nitrobenzene and p-nitrobenzoic acid incorporated into micelles

The radical anions of nitrobenzene and p-nitrobenzoic acid have been prepared chemically for the first time in aqueous solutions with the aid of micelles. The radicals thus prepared are stable and the resulting ESR spectra are unsymmetrical owing to the suppressed rotational diffusion of the radicals due to incorporation into micelles. The environments surrounding the radicals are discussed in terms of the ¹⁴N hyperfine coupling constants and the rotational correlation times. For p-nitrobenzoic acid radical anion, the temperature dependence of the ESR spectrum has been studied.