Dinitrogen dioxide

Dinitrogen dioxide is an inorganic compound having molecular formula N
₂O
₂. Many structural isomers are possible. The covalent bonding pattern O=N–N=O (a non-cyclic dimer of nitric oxide (NO)) is predicted to be the most stable isomer based on ab initio calculations and is the only one that has been experimentally produced.^[1] In the solid form, the molecules have C_2v symmetry: the entire structure is planar, with the two oxygen atoms cis across the N–N bond. The O–N distance is 1.15 Å, the N–N distance is 2.33 Å, and the O=N–N angle is 95°.^[2]

Quick facts Identifiers, Properties ...

Dinitrogen dioxide

Identifiers
CAS Number	linear: 16824-89-8 Y 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 Y
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

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It is an intermediate in the high-pressure disproportionation of nitric oxide:^[3][4]

2NO ⇌ N₂O₂

N₂O₂ + NO → N₂O + NO₂