The e.s.r spectrum of the radical cation of hexamethylbenzene at 77 K shows that the degeneracy of the ψA and ψS orbitals is lifted, since four strongly coupled methyl groups (11.5 G) and two weakly coupled methyl groups [(–)2.8 G] are observed; at 130 K, all six methyl groups become equivalent as a result of dynamic averaging of the hyperfine couplings.
C. J. Rhodes, J. Chem. Soc., Chem. Commun., 1989, 327 DOI: 10.1039/C39890000327
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