Dinitrogen dioxide

Dinitrogen dioxide is an inorganic compound having molecular formula N
₂O
₂. The covalent structure could be O=NN=O or other structural isomer. It is a dimer of nitric oxide (NO).

Dinitrogen dioxide

Identifiers
CAS Number	linear: 16824-89-8 cyclic: 13354-65-9 bicyclic: 158362-70-0
3D model (JSmol)	linear: Interactive image cyclic: Interactive image bicyclic: Interactive image
ChEBI	linear: CHEBI:29797
ChemSpider	linear: 5256996 cyclic: 29334740 bicyclic: 57448491
Gmelin Reference	1035
PubChem CID	linear: 6857661
UNII	P6TX5AE4Q8
InChI InChI=1S/N2O2/c3-1-2-4 Key: AZLYZRGJCVQKKK-UHFFFAOYSA-N
SMILES linear: N(=O)N=O cyclic: O1N=NO1 bicyclic: O1N2N1O2
Properties
Chemical formula	N2O2
Molar mass	60.012 g·mol^−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

O=NN=O is the most stable isomer. It is the only isomer that has been experimentally produced.[1] In the solid form the molecules have C2v symmetry. O–N distance is 1.15 Å, N–N distance is 2.33 Å. The molecules are planar, in cis form with ∠ONN of 95°.[2]

References

1. Nguyen, Kiet A.; Gordon, Mark S.; Montgomery, John A. Jr.; Michels, H. Harvey (October 1994). "Structures, Bonding, and Energetics of N2O2 Isomers". The Journal of Physical Chemistry. 98 (40): 10072–10078. doi:10.1021/j100091a021.
2. Park, Jong Keun; Sun, Hosung (1999). "Theoretical Determination of Geometrical Structures of the Nitric Oxide Dimer, (NO)₂". Bulletin of the Korean Chemical Society (in Korean). 20 (12): 1399–1408. ISSN 0253-2964.

• The 16 valence electronic states of nitric oxide dimer