Influence of the hydrogen bond on the N-H stretching frequencies in amino-acids

  • R. S. Krishnan
  • K. Krishnan

5. Summary

The spectra of glycine, its addition compounds and other amino-acids exhibit Raman lines in the region from 3250 cm.−1 to 2500 cm.−1 It has been shown that these lines cannot be assigned to N-H...O stretching vibrations, where the N atom has the covalency of three, but to N+-H...O stretching vibration where the N atom has the covalency of four. Using the data obtained with triglycine sulphate which has the largest number of N+-H...O bonds and whose H bond lengths are known, the correlation curve giving the relation between the N+-H...O stretching frequencies and the corresponding H bond lengths has been drawn. Using this correlation curve, the N+-H...O stretching frequencies appearing inα-glycine,γ-glycine, diglycine hydrochloride, diglycine hydrobromide,l-asparagine monohydrate anddl-alanine have been satisfactorily accounted for on the basis of the known hydrogen bond lengths in these substances.


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Copyright information

© Indian Academy of Sciences 1964

Authors and Affiliations

  • R. S. Krishnan
    • 1
  • K. Krishnan
    • 1
  1. 1.Department of PhysicsIndian Institute of ScienceBangalore

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