Abstract
The densities of solutions of HF in n-PrOH were measured at different mole ratios of the components (from 1 : 12 to 3 : 1), and their IR spectra were recorded. The spectra of all the solutions exhibit absorption bands at 3500, 2600, and 1800 cm–1 and continuous absorption (CA) in the frequency range from 3500 to 1300 cm–1. The intensities of these bands and CA increase in proportion to the concentration of HF in solution. The difference between the experimental solution density and the calculated additive sum of the densities of the solution components behaves analogously. The formation of heterocomplexes with a stoichiometric ratio greater than 3 : 1 in the HF solutions in propanol was revealed. These heterocomplexes have large identical structural fragments with the strong quasi-symmetric H-bond. The results of calculations of the stretching vibration frequencies and relative stability of different cyclic pentamers suggest that such a fragment is the most stable cyclic heteropentamer, (HF)2(nPrOH)3, in which the HF molecules occupy the neighboring positions.
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Sukhoverkhov, V.F., Buslov, D.K., Sushko, N.I. et al. IR spectra of hydrogen fluoride solutions in n-propanol. Russian Chemical Bulletin 51, 90–95 (2002). https://doi.org/10.1023/A:1015061713850
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DOI: https://doi.org/10.1023/A:1015061713850