Infrared absorption spectra of chalcone analogues have been reported by several workers ~, 2, 6, 10, but little attention has been paid to the effect of polynuclear groups on the stretching frequency of ~,~-unsaturated carbonyl group. The present work has, therefore, been undertaken to gain more information about the spectroscopic characteristics of phen- anthry] chalcones, which may lead to interesting generalisations on the structure--spectra correlations. The ...
