Study of the interaction of polyacrylonitrile with solvents according to IR absorption spectra

Abstract

Investigations of systems with hydrogen bonds AN...B, where A = O, N, C, have led to the conclusion that the most important manifestation of hydrogen bonding in IR specta is amplification of the intensity of the ~(AH) band; correlations have been found between the increase in the integrated intensity and the enthalpy of formation of hydrogen bonds and also between the increase in the intensity and the shift of the frequency of the ~(AH) vibration bands [i]. In studying ion-molecular interactions in the systems R-OH...A-, where A= i-, CI-, Br-, and K+...B-RI, where K + = Na +, Li +, Mg 2+, and B-RI is acetonitrile or pyridine, Perelygin et al. [2] also observed a shift of the maximums of a series of IR absorption bands of electrondonor molecules toward greater frequencies and an increase in the integrated intensities. Thus, generality was determined in the behavior of the absorption bands in IR spectra of electron-acceptor and electron-donor molecules during formation of ion-molecular and intermolecular bonds having identical donor--acceptor nature of interaction. It is evident that the effects of the manifestation will be different in relaxation to the structure of the molecules participating in complexation and the types of the considered vibrations.