Systematic measurements of the IR spectra of solutions of HF in N,N-dimethylformamide, acetone, and acetonitrile have been carried out for the first time in a wide range of variation of the molar ratio of the components (from 0:1 to 7:1, 8.9:1, and 10:1, respectively). This has not only scientific significance but also important applied significance. The absorption features of each of the binary liquid systems studied here and the spectral attributes of the heterocomplexes formed in it are analyzed. It is established that the molecular associates (HF)<sub>n</sub>⋅(CH3)2NCHO and (HF)<sub>n</sub>⋅(CH3)2CO contain the same large structural fragment the appearance of which is typical of solutions of HF in organic solvents.

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