We have obtained clear e.s.r. evidence that the orbital degeneracy of 2E1g benzene cations is removed at 4.2 K in Freon matrices and the unpaired electron occupies the b2g orbital with D2h symmetry, giving major spin densities on the C(1) and C(4) atoms; however the six carbon atoms become equivalent at >ca. 100 K by dynamic averaging.
M. Iwasaki, K. Toriyama and K. Nunome, J. Chem. Soc., Chem. Commun., 1983, 320 DOI: 10.1039/C39830000320
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