Hinderungspotentiale und Resonanzenergien von Nitrosobenzol und seinem Radikalanion / Potential barriers and resonance energies of nitrosobenzene and its radical anion

Abstract

For the nitrosobenzene radical anion the potential barrier of restricted rotation has been determined to be Ea = (8.6 + 0.5) kcal/mol. This result was obtained by comparing the ESR spectra of the radical at -78 °C and + 22 °C. The barriers of the radical ion and its neutral parent molecule are equal to the resonance energies of the -C6H5 and -NO fragments, which demonstrates that the restriction of the rotation is mainly due to resonance interaction.