Back Stikstoftetroksied Afrikaans رباعي أكسيد ثنائي النتروجين Arabic دی‌نیتروژن تترااوکسید AZB Диазотен тетраоксид Bulgarian Tetraòxid de dinitrogen Catalan Dinitrogentetraoxid Danish Distickstofftetroxid German Tetróxido de dinitrógeno Spanish دی‌نیتروژن تتراکسید Persian Typpitetraoksidi Finnish

Dinitrogen tetroxide

Dinitrogen tetroxide
Full structural formula
Full structural formula
Space-filling model
Space-filling model
Nitrogen dioxide at different temperatures
Nitrogen dioxide at −196 °C, 0 °C, 23 °C, 35 °C, and 50 °C. (NO
2) converts to the colorless dinitrogen tetroxide (N
2O
4) at low temperatures, and reverts to NO
2 at higher temperatures.
Names
IUPAC name
Dinitrogen tetroxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.031.012 Edit this at Wikidata
EC Number
  • 234-126-4
2249
RTECS number
  • QW9800000
UNII
UN number 1067
  • InChI=1S/N2O4/c3-1(4)2(5)6 checkY
    Key: WFPZPJSADLPSON-UHFFFAOYSA-N checkY
  • InChI=1/N2O4/c3-1(4)2(5)6
    Key: WFPZPJSADLPSON-UHFFFAOYAS
  • [O-][N+](=O)[N+]([O-])=O
Properties
N2O4
Molar mass 92.010 g·mol−1
Appearance White solid, colorless liquid, orange gas
Density 1.44246 g/cm3 (liquid, 21 °C)
Melting point −11.2 °C (11.8 °F; 261.9 K) and decomposes to NO2
Boiling point 21.69 °C (71.04 °F; 294.84 K)
Reacts to form nitrous and nitric acids
Vapor pressure 96 kPa (20 °C)[1]
−23.0·10−6 cm3/mol
1.00112
Structure
Planar, D2h
small, non-zero
Thermochemistry
304.29 J/K⋅mol[2]
+9.16 kJ/mol[2]
Hazards
GHS labelling:
GHS03: OxidizingGHS05: CorrosiveGHS06: ToxicGHS07: Exclamation mark
Danger
H270, H314, H330, H335, H336
P220, P244, P260, P261, P264, P271, P280, P284, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P320, P321, P363, P370+P376, P403, P403+P233, P405, P410+P403, P501
NFPA 704 (fire diamond)
[3][4]
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 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
3
0
0
OX
Flash point Non-flammable
Safety data sheet (SDS) External SDS
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 tetroxide, commonly referred to as nitrogen tetroxide (NTO), and occasionally (usually among ex-USSR/Russian rocket engineers) as amyl, is the chemical compound N2O4. It is a useful reagent in chemical synthesis. It forms an equilibrium mixture with nitrogen dioxide. Its molar mass is 92.011 g/mol.

Dinitrogen tetroxide is a powerful oxidizer that is hypergolic (spontaneously reacts) upon contact with various forms of hydrazine, which has made the pair a common bipropellant for rockets.

  1. ^ International Chemical Safety Card https://www.ilo.org/dyn/icsc/showcard.display?p_lang=en&p_card_id=0930&p_version=2
  2. ^ a b P.W. Atkins and J. de Paula, Physical Chemistry (8th ed., W.H. Freeman, 2006) p.999
  3. ^ "Chemical Datasheet: Nitrogen tetroxide". CAMEO Chemicals NOAA. Retrieved 8 September 2020.
  4. ^ "Compound Summary: Dinitrogen tetroxide". PubChem. Retrieved 8 September 2020.

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