Dinitrogen trioxide

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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)
Std enthalpy of
formation
(ΔfH⦵298)
 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
  • Nitrogen trioxide
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.

Structure and bonding

Dinitrogen trioxide molecule contains an

triflic anhydride in dichloromethane solution at -30°C.[6]

If the nitrous acid is not then used up quickly, it decomposes into nitric oxide and nitric acid. Nitrite salts are sometimes produced by adding N2O3 to water solutions of bases:

N2O3 + 2 NaOH → 2 NaNO2 + H2O

Typically, N–N bonds are similar in length to that in

low-temperature, gaseous N2O3:[4]

The bond lengths and angles of dinitrogen trioxide.

Similar to

nitronium nitrate, this molecule can also co-exist in equilibrium with an ionic gas called nitrosonium nitrite ([NO]+[NO2]–) [7]

References

  1. ^ "Dinitrogen trioxide".
  2. ^
    ISBN 978-0-08-037941-8
    .
  3. ^ "Dinitrogen trioxide". pubchem.ncbi.nlm.nih.gov. Retrieved 23 December 2021.
  4. ^
    ISBN 978-0-08-022057-4
    .
  5. ISBN 0-12-352651-5
  6. PMID 35653176
    .
  7. ISSN 1573-8779
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Dinitrogen_trioxide&oldid=1225353245"