Dinitrogen difluoride, N2F2
A number of interpreted spectra are available for interactive Jmol/JSpecView display
(IR) (Z) cis-N2F2 --- (R) (Z) cis-N2F2 --- overlay the two --- split overlay
(IR)(E) trans-N2F2 --- (R) (E) trans-N2F2 --- overlay the two --- split overlay
overlay IR --- split overlay --- overlay Raman --- split overlay

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Dinitrogen difluoride, N2F2 is a gas at room temperature, and was first identified in 1952 as the thermal decomposition product of the azide N3F. It has the structure F-N=N-F and exists in both a cis- and trans-form. The cis- configuration lies in a C2v symmetry and the trans-form has a symmetry of C2h. These isomers are thermally interconvertible and can be separated by low temperature fractionation. The trans-form is less thermodynamically stable but can be stored in glass vessels. The cis-form attacks glass over a time scale of about 2 weeks to form silicon tetrafluoride and nitrous oxide.
2 N2F2 + SiO2 → SiF4 + 2 N2O

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

Acknowledgements
The spectra were simulated using the WebMO interface to Gaussian. IR and Raman spectra were exported as uncompressed JCAMP-DX files and on-line computing times were less than 10 seconds for each isomer.

References:
Some of the information has been sourced from Wikipedia under the Creative Commons License.

Shih-Tung King, J. Overend
Spectrochimica Acta Volume 22, Issue 4, April 1966, Pages 689-694 Infrared and Raman spectra of trans N2F2
http://dx.doi.org/10.1016/0371-1951(66)80099-1

S.-T. King, J. Overend
Spectrochimica Acta Part A: Molecular Spectroscopy, Volume 23, Issue 1, January 1967, Pages 61-66 The vibrational spectrum of cis N2F2
http://dx.doi.org/10.1016/0584-8539(67)80208-3

Russell H. Sanborn
J. Chem. Phys. 33, 1855 (1960) Infrared Spectra and Structure of the Isomers of N2F2
http://dx.doi.org/10.1063/1.1731518

EMR KIREMIRE
ORIENTAL JOURNAL OF CHEMISTRY, 2012, Vol. 28, No. (1):Pg. 189-202 The Unshifted Atom-A Simpler Method of Deriving Vibrational Modes of Molecular Symmetries
http://orientjchem.org/dnload/EMR-Kiremire/OJCV028I01P189-202.pdf

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Created and maintained by Prof. Robert J. Lancashire,
The Department of Chemistry, The University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created February 2015. Links checked and/or last modified 17th February 2019.
URL http://wwwchem.uwimona.edu.jm/spectra/jsmol/demos/N2F2.html