Abstract
The circular dichroism and electronic absorption spectra of (+)-1-fluoro-12-methylbenzo[c]phenanthrene are reported. The results are compared with the theoretical rotational and dipole strengths of the lower-energy π → π * transitions in the optical isomers of the overcrowded, non-coplanar, benzo[c]phenanthrene molecule. The comparison indicates that (+)-1-fluoro-12-methylbenzo[c]phenanthrene has the stereochemical form of a segment of a right-handed helix (I), viewed in the direction perpendicular to the mean molecular plane.
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