An electron spin resonance study of imidazole radical cations
Abstract
ESR spectroscopy shows that the SOMO in 1-alkylimidazole radical cations corresponds to the π3 orbital, as is the case for pyrrole, furan, and thiophene cations, but there is a nodal shift in the wavefunction which distributes most of the spin density unsymmetrically between the two nitrogen atoms.