Nitryl fluoride
Nitryl fluoride
Nitryl fluoride
Nitryl fluoride
Nitryl fluoride
3D model (JSmol)
ECHA InfoCard 100.030.007 Edit this at Wikidata
EC Number
  • 233-021-0
  • InChI=1S/FNO2/c1-2(3)4 ☒N
  • InChI=1/FNO2/c1-2(3)4
  • [N+](=O)([O-])F
Molar mass 65.003 g·mol−1
Melting point −166 °C (−267 °F; 107 K)
Boiling point −72 °C (−98 °F; 201 K)
Related compounds
Other anions
nitryl chloride, nitryl bromide
Other cations
nitrosyl fluoride, sulfuryl fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Nitryl fluoride, NO2F, is a colourless gas and strong oxidizing agent, which is used as a fluorinating agent[1] and has been proposed as an oxidiser in rocket propellants (though never flown).

It is a molecular species, not ionic, consistent with its low boiling point. The structure features planar nitrogen with a short N-F bond length of 135 pm.[2]


Henri Moissan and Paul Lebeau recorded the preparation of nitryl fluoride in 1905 by the fluorination of nitrogen dioxide. This reaction is highly exothermic, which leads to contaminated products. The simplest method avoids fluorine gas but uses cobalt(III) fluoride:[3]

NO2 + CoF3 → NO2F + CoF2

The CoF2 can be regenerated to CoF3. Other methods have been described.[4]

Thermodynamic properties

The thermodynamic properties of this gas were determined by IR and Raman spectroscopy[5] The standard heat of formation of FNO2 is -19 ± 2 kcal/mol.3


Nitryl fluoride can be used to prepare organic nitro compounds and nitrate esters.

See also


  1. ^ Merck Index, 13th edition (2001), p.1193
  2. ^ F. A. Cotton and G.Wilkinson, Advanced Inorganic Chemistry, 5th edition (1988), Wiley, p.333.
  3. ^ Davis, Ralph A.; Rausch, Douglas A. (1963). "Preparation of Nitryl Fluoride". Inorganic Chemistry. 2 (6): 1300–1301. doi:10.1021/ic50010a048.
  4. ^ Faloon, Albert V.; Kenna, William B. (1951). "The Preparation of Nitrosyl Fluoride and Nitryl Fluoride1". Journal of the American Chemical Society. 73 (6): 2937–2938. doi:10.1021/ja01150a505. hdl:2027/mdp.39015095101013. ISSN 0002-7863.
  5. ^ a b c d e Tschuikow-Roux, E. (1962). "Thermodynamic Properties of Nitryl Fluoride". Journal of Physical Chemistry. 66 (9): 1636–1639. doi:10.1021/j100815a017.