Spectroscopic study of monosubstituted amides. VII— low frequency Raman spectra of crystallized N‐methylacetamide | Zendy

Fillaux F. | Zendy; Baron M. H. | Zendy; De Loze C. | Zendy; Sagon G. | Zendy

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Spectroscopic study of monosubstituted amides. VII— low frequency Raman spectra of crystallized N‐methylacetamide

Author(s) -

Fillaux F.,

Baron M. H.,

De Loze C.,

Sagon G.

Publication year - 1978

Publication title -

journal of raman spectroscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.748

H-Index - 110

eISSN - 1097-4555

pISSN - 0377-0486

DOI - 10.1002/jrs.1250070504

Subject(s) - raman spectroscopy , chemistry , spectral line , crystallite , isotopic shift , resonance (particle physics) , crystallography , nuclear magnetic resonance , computational chemistry , analytical chemistry (journal) , atomic physics , organic chemistry , physics , optics , astronomy

The Raman spectra of 10 isotopic species of polycrystalline NMA were recorded at 35 K between 6 and 200 cm −1 . Below 110 cm −1 at least 8 transitions are observed which are mainly due to external modes. Bands located between 110 and 170 cm −1 show unexpected isotopic effects and are interpreted taking into account IR and NIS spectra. A new internal torsional mode around the bond is proposed. The corresponding potential function involves two minima (Δω = ± 10°) separated by a weak barrier (∼600 cal/mole) indicating a nonplanar molecular skeleton.

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