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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > August  >
In the Laboratory
Applications of Group Theory: Infrared and Raman Spectra of the Isomers of 1,2-Dichloroethylene. A Physical Chemistry Experiment
Norman C. Craig and Nanette N. Lacuesta
Department of Chemistry, Oberlin College, Oberlin, OH 44074
Cover
August 2004
Vol. 81 No. 8
p. 1199
Abstract
An experiment for the undergraduate physical chemistry laboratory, or an integrated analytical-physical laboratory, illustrates the application of spectroscopic selection rules for vibrational fundamentals as derived from group theory. The selection rules for the cis- and trans- isomers of 1,2-dichloroethylene are applied to assigning the vibrational fundamentals of these related but symmetrically distinct molecules. Applications of shapes of bands in gas-phase infrared spectra and of depolarization ratios of bands in liquid-phase Raman spectra are illustrated in making these assignments. The fundamental frequencies and the corresponding intensities in the infrared spectrum are compared with calculations made by DFT methods. Spectra are supplied in electronic format as part of the lab documentation.
Supplement
Details on sample handling and spectra used in the experiment are available.
*  Contents Folder JCE2004p1199W containing two sub-folders, tDC1E and cDC1E containing the spectral files described in the PDF.
 
*  Download



 
More Information
*  Citation
 Craig, Norman C.; Lacuesta, Nanette N. J. Chem. Educ. 2004 81 1199.
*  Keywords
 Analytical Chemistry; Computational Chemistry; Group Theory; IR Spectroscopy; Laboratory Instruction; Physical Chemistry; Raman Spectroscopy
*  History
 Created:
Last Updated:		 June 17, 2004
August 10, 2004
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