Solvent effect on the intensity of CN stretching vibration for some nitriles

Abstract

The present situation as to tile effect of the medium on electronic and vibrationM spectra is typical of a field which is at t ract ing a rapidly increasing body of interest. In the case of electronic spectra a very promising approach appears to be tha t by KOSOWER (1), who proposed the use of the transition energ'ies corresponding to some appropiate chargetransfer bands as an empirical measure of solvent polari ty; these Iransition energies (designated as Z-values) are linear functions of the Winstein-Griinwald ]2-value,whi('h is a kinetic measure of the ionizing power of the medium. In the case of vibrational spe(.ira, concerned with our present measurements, the theorelieal t reatments up to present proposed (2) are essentially foeuse4 on tile ewduat.ion of ~he extent of electrostatic solute-solvent interactions; tim first equation to be deduced, that by Kirkwood-Bauer-Magat (KBM),