Abstract
The triplet EPR spectra of the three monofluorobenzonitriles in ethanol glasses at ≈90 K have been compared. Ortho- and meta-fluorine merely broaden the Δ M = 2 signals, whereas para-fluorine produces a 54 G splitting. In accord with simple symmetry considerations, the 3L a state of benzonitrile is predominately a 1,4-diradical with little free spin density at the ortho and meta positions.
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