Abstract
The IR spectra and the densities of solutions in HF-pyridine and HF-formamide binary liquid systems were measured over a wide range of mole ratios HF: Solv (Solv is the organic solvent). The composition of heteroassociates (HA) formed in these systems was determined by analysis of the concentration dependences of normalized (to the total number of moles per 1 L) optical density in the IR region and the excess density of the binary mixtures under study. The HA with the stoichiometric ratio 3: 1 are present in the HF-Py system at all studied mole ratios of the components (from 1: 12 to 20: 1). The 1: 2 HA were found in the dilute solutions, whereas the >6: 1 HA were revealed in the concentrated solutions. The HA with the stoichiometric ratio 4: 1 were found in HF-formamide system. The results obtained were compared with the known data on the composition of HA formed in the binary liquid systems HF-DMF, HF-Me2CO, and HF-MeCN.
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