Abstract
Abstract The phenomenon of Fermi Resonance has been studied in benzoyl chloride and its p -(NO 2 , Cl, Br, OCH 3 , OC 4 H 9 , N(CH 3 2 ) derivatives, in the carbonyl stretching region. Using the method of solvent variation, the Fermi coupling coefficient W has been determined in each case. W varies appreciably with substitution, showing a linear dependence on σ for electron releasing substituents and on σ + for all substituents. This dependence is explained in terms of the contribution of k ss , the quadratic internal force constant of the carbonyl group, to k stt , the anharmonic constant in normal coordinates which determines W , and the influence of σ on k ss .
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