Abstract
AN infra-red investigation of hydrogen bonding in various gaseous mixtures showed the band arising from, the hydrogen stretching vibration to be unusually broad even for gaseous complexes1–3. In favourable cases the structure of the broad absorption contour was clear, consisting of a central band with a subsidiary band on both the low and high frequency sides. An assignment was suggested of the central band to the hydrogen stretching frequency and of the side bands to sum and difference bands of this frequency and the stretching frequency of the hydrogen bond. The pattern of results for the complexes of hydrogen chloride and fluoride with ethers, and of methanol with amines, was found to accord with this view. On the other hand, the band structure found for mixtures of nitric acid and ethers had some unexpected features. The frequency of the hydrogen bond stretching frequency inferred from the sum and difference band interpretation was unexpectedly high by comparison with the other complexes, and the change in band structure found on transferring to deutero-nitric acid was also anomalous. Accordingly, we have made a further investigation of systems of nitric acid and ether. We are prompted to report briefly on this by the comments of Carlson, Witkowski and Fateley4 on the far infra-red spectrum of this and other related gaseous systems.
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References
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Millen, D. J., and Zabicky, J., J. Chem. Soc., 3080 (1965).
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Carlson, G. L., Witkowski, R. E., and Fateley, W. G., Nature (preceding communication).
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AL-ADHAMI, L., MILLEN, D. Band-broadening in Infra-red Spectra of Gaseous Hydrogen-bonded Complexes. Nature 211, 1291 (1966). https://doi.org/10.1038/2111291a0
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DOI: https://doi.org/10.1038/2111291a0
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