Abstract
This paper presents a review that generalizes numerous papers by the author on the study, using vibrational spectra, of the constitution and properties of polar organic liquids that possess microheterogeneous associative structure. To quantitatively describe the features of the structure, a quantity called the degree of mutual orientation of the molecules is introduced that is closely associated with the specific energy of orientational interactions and is calculated from the frequency shifts observed in the spectra accompanying the vapor-liquid phase transition and from the broadening of spectral bands in addition to Brownian broadening. It is shown that the degree of mutual orientation of the molecules of liquids is a universal characteristic of a statistically disordered polar substance and can be applied both to nonassociated (consisting of monomeric molecules) and to various associated systems. The detected correlations made it possible to draw specific conclusions concerning the structure of a large number of organic compounds having various constitutions in the liquid state.
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