ENHANCEMENT OF INFRARED ABSORPTION BANDS OF CHARGE TRANSFER $COMPLEXES^{*}$

Abstract

“An enhancement of infrared absorption bands due to change in vertical ionization energy or change in vertical electron affinity during the course of molecular vibration is shown to be inherent in charge-transfer theory. A semiquantitative calculation of the intensity enhancement of the symmetric ring stretching vibrational mode of benzene in the benzene-iodine complex agrees well with the experimentally observed value. Consequently, earlier objections to a symmetrical model for the complex may not be valid.”