Infrared spectra of the CO2⋅⋅⋅HF and N2O⋅⋅⋅HF complexes in solid argon at 12 K

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Abstract
Codeposition of argon diluted samples of CO2 and HF at 12 K produced new absorptions at 3871, 2354, 656, and 313 cm−1 which are assigned to the CO2⋅⋅⋅HF complex. The 3871 and 313 cm−1 absorptions are due to the H–F stretching and librational motions of the HF submolecule in the complex, as verified by DF substitution, and the 2354 and 656 cm−1 bands are due to CO2 submolecule modes. The N2O⋅⋅⋅HF complex spectrum contained bands at 3851, 2250, 1306, 583, 328, and 325 cm−1. The greater observed displacement in the HF submolecule modes suggests slightly stronger hydrogen bonding in the N2O complex. The lack of splitting in the degenerate librational mode for CO2⋅⋅⋅HF shows that this complex is linear, whereas the 3 cm−1 splitting in this mode for N2O⋅⋅⋅HF is consistent with a nonlinear complex, in agreement with microwave spectra.

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