Abstract
Using the method of solvent variation, the splitting of the carbonyl band of compounds I–VII has been interpreted as a Fermi resonance. Then substituent effects may be studied by correcting the frequencies and measuring the integrated intensifies and α slopes of B.H.W. plots for the carbonyl stretching vibration. In the ArCOMe series, the lack of correlation between these properties and the Streitwieser's parameters for polynuclear aryl groups have been attributed to an important steric effect of 9-anthryl and 1-naphthyl substituents.
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