1,2-dichloroethylene
A number of interpreted spectra are available for interactive Jmol/JSpecView display
(IR) (Z) cis-C2H2Cl2 --- (R) (Z) cis-C2H2Cl2 --- overlay the two --- split overlay
(IR)(E) trans-C2H2Cl2 --- (R) (E) trans-C2H2Cl2 --- overlay the two --- split overlay
overlay IR --- split overlay --- overlay Raman --- split overlay

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The cis-isomer belongs to the C2v point group while the trans-isomer to the C2h symmetry group.

Character table for C2v point group
E C2 (z) σv(xz) σv(yz) linear,
rotations		 quadratic
A1 1 1 1 1 z x2, y2, z2
A2 1 1 -1 -1 Rz xy
B1 1 -1 1 -1 x, Ry xz
B2 1 -1 -1 1 y, Rx yz
Character table for C2h point group
E C2 (z) i σh linear,
rotations		 quadratic
Ag 1 1 1 1 Rz x2, y2, z2, xy
Bg 1 -1 1 -1 Rx, Ry xz, yz
Au 1 1 -1 -1 z
Bu 1 -1 -1 1 x, y

References:
Applications of Group Theory: Infrared and Raman Spectra of the Isomers of 1,2-Dichloroethylene
Norman C. Craig and Nanette N. Lacuesta, Journal of Chemical Education, Vol. 81 No. 8 August 2004, p 1199

Educational Applications of IR and Raman Spectroscopy: A Comparison of Experiment and Theory
Brian L. McClain, Sara M. Clark, Ryan L. Gabriel, and Dor Ben-Amotz, Journal of Chemical Education, Vol. 77 No. 5 May 2000, p 654
Vibration Spectra of cis and trans Dichloroethylene-d1
H.J. Bernstein and A.D.E. Pullin, Canadian Journal of Chemistry, 30 1952, 963.

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Created and maintained by Prof. Robert J. Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created February 2012. Links checked and/or last modified 13th February 2014.
URL http://wwwchem.uwimona.edu.jm/spectra/jsmol/demos/DCE.html