Abstract
The solid state CD spectra were measured for enantiomorphous crystals of benzophenone 1 and 4,4 ′-dimethylbenzophenone 2 . The helicity of the constituent molecules was determined from the sign of the Cotton effect corresponding to the ketone n– π ∗ transition. In addition the crystalline 1:2 inclusion complexes of the ketone 1 and thiobenzophenone 4 with cholic acid were prepared and their CD spectra were measured. The observed negative Cotton effect sign of 1· CA and positive one for 4· CA corresponding to the lowest energy n– π ∗ transitions were correlated with the M and P helicity of the enclathrated guest molecules, respectively. The helicity of the guest molecules was confirmed by X-ray crystal structure analyses.
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