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Far‐infrared spectra of N ‐methylacetamide and related compounds and hydrogen‐bond force constants
Author(s) -
Itoh Koichi,
Shimanouchi Takehiko
Publication year - 1967
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1967.360051006
Subject(s) - chemistry , infrared spectroscopy , hydrogen bond , raman spectroscopy , force constant , molecule , infrared , spectral line , far infrared , vibration , computational chemistry , organic chemistry , physics , quantum mechanics , astronomy , optics
Far‐infrared spectra of N ‐methylacetamide and other monosubstituted amides were measured in the liquid state in the region from 250 to 60 cm. −1 . Bands characteristic of the molecules with a peptide bond were found and assigned to the hydrogen‐bond vibration and the CN torsional vibration. Far‐infrared and Raman spectra of crystalline N ‐methylacetamide were measured. The normal coordinate treatment for the low‐temperature modification of cystalline N ‐methylacetamide was made. A reasonable set of force constants can explain all the spectra and their change due to the modification transition.