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,
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,
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

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.

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

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

Russell H. Sanborn
J. Chem. Phys. 33, 1855 (1960) Infrared Spectra and Structure of the Isomers of N2F2

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

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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 2015. Links checked and/or last modified 6th February 2015.
URL http://wwwchem.uwimona.edu.jm/spectra/jsmol/demos/DCE.html