Abstract
Using the three binary liquid systems HF-(C<sub>2</sub>H<sub>5</sub>)<sub>2</sub>CO, HF-CH<sub>3</sub>CN, and HF-HCON(CH<sub>3</sub>)<sub>2</sub> as examples, a simple method is proposed and tested for detecting stable heteroassociates (HAs) in solution and determining the number of various types of these HAs. When the variation of the vibrational frequencies of the multiple bonds of the solvent (Solv) molecules with the concentration of the solution was analyzed, it showed that the formation of various compositions of HAs is spectrally manifested by appreciable displacements (by about 15-170cm<sup>−1</sup>) of the CO(CN) vibration band. If the shape of this vibration remains approximately constant as the Solv molecule makes a transition from the pure solvent into the composition of the various types of associates, the corresponding frequency shifts have the same sign. A change in the shape of such a vibration when a solvent molecule is incorporated into any of the heterocomplexes can cause this sign to change.
© 2010 Optical Society of America
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