Nitrogen oxide

Nitrogen oxide may refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds:

Charge-neutral
  • NO
    x     (Pron. "knocks"), = NO + the free radical NO2, defined as such due to the rapid gas-phase inter-conversion between NO and NO2. NO2 dimerises to liquid N2O4 under pressure.
  • NOy = the sum of all oxidized odd-Nitrogen species (e.g. NOx + HNO3 + HONO + etc.)
  • NOz = NOy - NOx
  • Nitric oxide, also known as nitrogen monoxide (NO), nitrogen(II) oxide
  • Nitrogen dioxide (NO2), nitrogen(IV) oxide
  • Nitrous oxide (N2O), nitrogen(−I,III) oxide
  • Nitrosylazide (N4O), nitrogen(−I,0,I,II) oxide
  • Oxatetrazole (N4O)
  • Dinitrogen trioxide (N2O3), nitrogen(II,IV) oxide
  • Dinitrogen tetroxide (N2O4), nitrogen(IV) oxide
  • Dinitrogen pentoxide (N2O5), nitrogen(V) oxide
  • Nitrate radical (NO3),nitrogen(VI) oxide
  • Trinitramide (N(NO2)3 or N4O6), nitrogen(0,IV) oxides

Anions
  • Dinitramide (N(NO2)3−)
  • Nitrite (NO−
    2    )
  • Nitrate (NO−
    3    )
  • Trioxodinitrate (N2O32-)
  • Peroxonitrite (ONO−
    2    )
  • Hyponitrite (N2O22-)
  • Nitroxylate (NO−)

Cations
  • Nitronium (NO+
    2    )
  • Nitrosonium (NO+
    )

Atmospheric sciences

In atmospheric chemistry,

  • NO
    x     (or NOx) refers to the sum of NO and NO2.[1][2]
  • NO
    y     (or NOy) = the sum of all oxidised atmospheric odd-nitrogen.
  • NO
    z     (or NOz) = NOy - NOx

See also
  • Nitrogen oxide sensor
  • Sulfur nitrides, which are valence isoelectronic with nitrogen oxides

References
  1. United States Clean Air Act, 42 U.S.C. § 7602
  2. Seinfeld, John H.; Pandis, Spyros N. (1997), Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, Wiley-Interscience, ISBN 0-471-17816-0
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