Nitrogen oxide

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

Charge-neutral[edit]

Nitric oxide (NO), nitrogen(II) oxide, or nitrogen monoxide
Nitrogen dioxide (NO₂), nitrogen(IV) oxide
Nitrogen trioxide (NO₃), or nitrate radical
Nitrous oxide (N₂O), nitrogen(0,II) oxide
Dinitrogen dioxide (N₂O₂), nitrogen(II) oxide dimer
Dinitrogen trioxide (N₂O₃), nitrogen(II,IV) oxide
Dinitrogen tetroxide (N₂O₄), nitrogen(IV) oxide dimer
Dinitrogen pentoxide (N₂O₅), nitrogen(V) oxide, or nitronium nitrate [NO₂]⁺[NO₃]⁻
Nitrosyl azide (N₄O), nitrogen(−I,0,I,II) oxide
Nitryl azide (N₄O₂)
Oxatetrazole (N₄O)
Trinitramide (N(NO₂)₃ or N₄O₆), nitrogen(0,IV) oxide

Anions[edit]

Nitroxide (O=N⁻)
Nitrite (O=N−O⁻ or NO−2)
Nitrate (NO−3)
Peroxynitrite (O=N−O−O⁻ or NO−3)
Peroxynitrate (O₂N−O−O⁻ or NO−4)
Orthonitrate (NO3−4, analogous to phosphate PO3−4)
Hyponitrite (⁻O−N=N−O⁻ or N₂O2−2)
Trioxodinitrate or hyponitrate ([O₂NNO]²⁻ or [N₂O₃]²⁻)
Nitroxylate ((⁻O−)₂N−N(−O⁻)₂ or N₂O4−4)
Dinitramide (O₂N−N⁻−NO₂ or N₃O−4)

Cations[edit]

Nitrosonium (N≡O⁺ or [NO]⁺)
Nitronium (O=N⁺=O or [NO₂]⁺)

Atmospheric sciences[edit]

In atmospheric chemistry:

NO_x (or NOx) refers to the sum of NO and NO₂.^[1]^[2]
NO_y (or NOy) refers to the sum of NO_x and all oxidized atmospheric odd-nitrogen species (e.g. the sum of NO_x, HNO₃, HNO₂, etc.)
NO_z (or NOz) = NO_y − NO_x

Aerospace[edit]

Mixed Oxides of Nitrogen ("MON"): solutions of nitric oxide in dinitrogen tetroxide/nitrogen dioxide.

Nitric oxide, NO
Nitrogen dioxide, NO₂
Nitrous oxide, N₂O
Dinitrogen trioxide, N₂O₃
Dinitrogen tetroxide, N₂O₄
Dinitrogen pentoxide, N₂O₅
Trinitramide, N₄O₆

Stability[edit]

Due to relatively weak N–O bonding, all nitrogen oxides are unstable with respect to N₂ and O₂, which is the principle behind the catalytic converter and prevents the combustion of the atmosphere.

References[edit]

^ United States Clean Air Act, 42 U.S.C. § 7602
^ 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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[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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