Abstract
Properties of the McConnell Q CH parameter relating proton isotropic hyperfine coupling constants to spin densities in planar nng radicals are examined. Q CH is a sensitive function of the hybridization of the C—H bond attached to radical carbocycles C n H n ( n = 3,5,6,7,8). The hybridization effect is most pronounced in the highly strained cyclopropenyl radical. Q CH spans a narrow range in most of the common π-radicals, including moderately strained fused systems like azulene, biphenylene, acenaphthylene and acepleiadylene anions.
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