The secondary band of the ultraviolet absorption spectra of acetophenones and related compounds ; The study of hydrogen bonding and similar effects by means of ultraviolet absorption spectra

Abstract

The absorption spectra of some acetophenones and benzoic acids have been measured in different solvents in the region 200-UCO mµ. The two major bands are compared and it is found that interactions which considerably alter the high intensity band have less and somewhat different effects on the secondary band. Solvent effects and the changes observed on substitution indicate that the weaker band (C-band) is essentially of similar character as the high intensity primary band (B-band). A unifying hypothesis to account for the observed changes is presented.