A New Relation between the N—H Stretching Frequencies of Primary Amides


BELLAMY et al.1, from the data obtained for a number of aromatic primary amines in dilute solutions, have shown that the N—H asymmetric and symmetric stretching frequencies are related by the expression νs = 345.5 + 0.875 νas. The standard deviation of the calculated symmetric stretching frequencies from those of the recorded values is about 5 cm−1. These workers also mention that the same relation would not be obeyed in situations where the two N—H links are non-equivalent.

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  1. 1

    Bellamy, L. J., and Williams, R. L., Spectrochimica Acta, 9, 341 (1957).

  2. 2

    Puranik, P. G., and Venkata Ramiah, K., J. Mol. Spectroscopy, 3, 486 (1959).

  3. 3

    Puranik, P. G., and Venkata Ramiah, K., Proc. Ind. Acad. Sci. (in the press).

  4. 4

    Davies, M., and Hallam, H. E., Trans. Farad. Soc., 47, 1177 (1951).

  5. 5

    Davies, M., and Evans, J. C., J. Chem. Phys., 20, 342 (1952).

  6. 6

    Cleverley, B., Chemical Applications of Spectroscopy, 514 (Interscience Pub., 1956).

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PURANIK, P., VENKATA RAMIAH, K. A New Relation between the N—H Stretching Frequencies of Primary Amides. Nature 191, 796–797 (1961). https://doi.org/10.1038/191796a0

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