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Interactions in liquid mixtures of formamide isotopomers studied by Raman spectroscopy
Author(s) -
Mortensen A.,
Nielsen O. Faurskov,
Yarwood J.,
Shelley V.
Publication year - 1995
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.1250260813
Subject(s) - isotopomers , formamide , raman spectroscopy , chemistry , isotropy , analytical chemistry (journal) , spectral line , organic chemistry , molecule , physics , astronomy , optics , quantum mechanics
Abstract Recently, anomalies concerning both intensities and peak positions of Raman bands in the carbonyl stretching region of liquid mixtures of different isotopomers of formamide were reported. More detailed investigations have now been performed for liquid mixtures of HCONH 2 and H 13 CONH 2 , and Raman spectra of mixtures of DCONH 2 and DCOND 2 in the carbonyl stretching region are presented. In the system DCONH 2 ‐DCOND 2 , collapse of the isotropic carbonyl bands was observed in the mixtures as previously reported for HCONH 2 ‐HCOND 2 and HCOND 2 ‐DCOND 2 . The system HCONH 2 —H 13 CONH 2 shows anomalous intensities compared with those expected for simple binary mixtures. However, this system does not show collapsing carbonyl bands in the isotopomeric mixtures. The phenomenon of collapsing bands can be explained in terms of a model known as mutual entrainment.