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.
C. J. Rhodes, J. Chem. Soc., Perkin Trans. 2, 1990, 725 DOI: 10.1039/P29900000725
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