INFRARED-SPECTRA AND FORCE-CONSTANTS OF UREA IN THE GASEOUS-PHASE

Citation
J. Langer et al., INFRARED-SPECTRA AND FORCE-CONSTANTS OF UREA IN THE GASEOUS-PHASE, Fresenius' journal of analytical chemistry, 352(5), 1995, pp. 489-495
Citations number
13
Categorie Soggetti
Chemistry Analytical
ISSN journal
09370633
Volume
352
Issue
5
Year of publication
1995
Pages
489 - 495
Database
ISI
SICI code
0937-0633(1995)352:5<489:IAFOUI>2.0.ZU;2-K
Abstract
Infrared spectra in the gaseous phase have been recorded for the first time for urea and the isotopomers urea-D-4, urea-N-15(2) and urea-C-1 3. On the base of these data a normal coordinate calculation has been performed, resulting in an optimized force field of urea, showing that , due to the very small intermolecular forces, the internal force cons tants increase by evaporation. This is especially true for the C=O-bon d with a force constant increased by 10%.