Back Distikstoftrioksied Afrikaans ثلاثي أكسيد ثنائي النتروجين Arabic دی‌نیتروژن تریاوکسید AZB Triòxid de dinitrogen Catalan Oxid dusitý Czech Dinitrogentrioxid Danish Distickstofftrioxid German Dinitrogena trioksido Esperanto Óxido de nitrógeno(III) Spanish دی‌نیتروژن تری‌اکسید Persian

Dinitrogen trioxide

Dinitrogen trioxide
Dinitrogen trioxide resonance hybrid
Dinitrogen trioxide is blue
Names
IUPAC name
N-Oxonitramide[1]
Other names
  • Nitrous anhydride
  • Nitrogen sesquioxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.031.013 Edit this at Wikidata
EC Number
  • 234-128-5
UNII
UN number 2421
  • InChI=1S/N2O3/c3-1-2(4)5 checkY
    Key: LZDSILRDTDCIQT-UHFFFAOYSA-N checkY
  • InChI=1/N2O3/c3-1-2(4)5
    Key: LZDSILRDTDCIQT-UHFFFAOYAC
  • [O-][N+](=O)N=O
Properties
N2O3
Molar mass 76.011 g·mol−1
Appearance Deep blue liquid
Density
  • 1.447 g/cm3, liquid
  • 1.783 g/cm3, gas
Melting point −100.7[2] °C (−149.3 °F; 172.5 K)
Boiling point 3.5 °C (38.3 °F; 276.6 K) (dissociates[2])
reacts to form nitrous acid
Solubility soluble in ether
−16.0·10−6 cm3/mol
Structure
planar, Cs
2.122 D
Thermochemistry
65.3 J/(mol·K)
314.63 J/(mol·K)
91.20 kJ/mol
Hazards
GHS labelling:[3]
GHS03: OxidizingGHS04: Compressed GasGHS05: CorrosiveGHS06: Toxic
Danger
H270, H280, H310, H310+H330, H314, H330
P220, P244, P260, P262, P264, P270, P271, P280, P284, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P322, P361, P363, P370+P376, P403, P403+P233, P405, P410+P403, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
3
0
2
OX
Flash point Non-flammable
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Dinitrogen trioxide (also known as nitrous anhydride) is the inorganic compound with the formula N2O3. It is a nitrogen oxide. It forms upon mixing equal parts of nitric oxide and nitrogen dioxide and cooling the mixture below −21 °C (−6 °F):[4]

•
NO + •
NO
2 ⇌ N
2O
3

Dinitrogen trioxide is only isolable at low temperatures, i.e. in the liquid and solid phases. In liquid and solid states, it has a deep blue color.[2] At higher temperatures the equilibrium favors the constituent gases, with KD = 193 kPa (25 °C).[5][clarification needed]

This compound is sometimes called "nitrogen trioxide", but this name properly refers to another compound, the (uncharged) nitrate radical •NO3.

  1. ^ "Dinitrogen trioxide".
  2. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 444. ISBN 978-0-08-037941-8.
  3. ^ "Dinitrogen trioxide". pubchem.ncbi.nlm.nih.gov. Retrieved 23 December 2021.
  4. ^ Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. pp. 521–22. ISBN 978-0-08-022057-4.
  5. ^ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5

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