An analysis of the e.s.r. spectra of unsymmetrically substituted diphenylmethylenes (e.g. p,p′-methoxy, cyano, dimethylamino, or nitro) indicate these species have a triplet ground state which is delocalized by merostabilization.
D. R. Arnold and R. W. R. Humphreys, J. Chem. Soc., Chem. Commun., 1978, 181 DOI: 10.1039/C39780000181
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