Composition of heteroassociates formed in HF-pyridine and HF-formamide binary liquid systems |
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| Authors: | G V Yukhnevich E G Tarakanova V F Sukhoverkhov I V Bykov |
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| Institution: | (1) N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119991 Moscow, Russian Federation;(2) V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 ul. Kosygina, 119991 Moscow, Russian Federation |
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| 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.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1281–1287, July, 2007. |
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| Keywords: | binary liquid system IR spectroscopy density of solution hydrogen bond heteroassociates hydrogen fluoride pyridine formamide |
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