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	{{chembox		{{chembox
			| Verifiedfields = changed
⚫	| verifiedrevid = 443693531
			| Watchedfields = changed
⚫	| Name = Dinitrogen trioxide
		⚫	| verifiedrevid = 443695072
⚫	| ImageFile = Dinitrogen-trioxide-3D-vdW.png
		⚫	| Name = Dinitrogen trioxide
	| ImageSize = 200px
	| ImageName = Dinitrogen trioxide		| ImageFile = Dinitrogen trioxide resonance hybrid.png
	| ImageFile1 = Dinitrogen-trioxide-xtal-3D-vdW.png		| ImageName = Dinitrogen trioxide resonance hybrid
			| ImageFile1 = Beautiful nitrogen trioxide2.jpg
	| IUPACName =
		⚫	| ImageName1 = Dinitrogen trioxide is blue
⚫	| OtherNames = Nitrous anhydride, nitrogen sesquioxide
			| IUPACName = ''N''-Oxonitramide<ref>{{Cite web|url=https://pubchem.ncbi.nlm.nih.gov/compound/nitrogen%20trioxide#section=IUPAC-Name&fullscreen=true|title = Dinitrogen trioxide}}</ref>
⚫	| Section1 = {{Chembox Identifiers
		⚫	| OtherNames = {{ubl|Nitrous anhydride|Nitrogen sesquioxide}}
⚫	| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
		⚫	| Section1 = {{Chembox Identifiers
			| CASNo_Ref = {{cascite|correct|??}}
			| CASNo = 10544-73-7
		⚫	| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
	| ChemSpiderID = 55446		| ChemSpiderID = 55446
⚫	| InChI = 1/N2O3/c3-1-2(4)5
⚫	| InChIKey = LZDSILRDTDCIQT-UHFFFAOYAC
	| ChEBI_Ref = {{ebicite|correct|EBI}}		| ChEBI_Ref = {{ebicite|correct|EBI}}
	| ChEBI = 29799		| ChEBI = 29799
	| SMILES = (=O)N=O		| EINECS = 234-128-5
		⚫	| PubChem = 61526
			| UNNumber = 2421
			| UNII_Ref = {{fdacite|correct|FDA}}
			| UNII = 16E0524PXI
		⚫	| InChI = 1/N2O3/c3-1-2(4)5
		⚫	| InChIKey = LZDSILRDTDCIQT-UHFFFAOYAC
	| StdInChI_Ref = {{stdinchicite|correct|chemspider}}		| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
	| StdInChI = 1S/N2O3/c3-1-2(4)5		| StdInChI = 1S/N2O3/c3-1-2(4)5
	| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}		| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
	| StdInChIKey = LZDSILRDTDCIQT-UHFFFAOYSA-N		| StdInChIKey = LZDSILRDTDCIQT-UHFFFAOYSA-N
	| CASNo = 10544-73-7		| SMILES = (=O)N=O
⚫	| PubChem = 61526
	}}		}}
	| Section2 = {{Chembox Properties		| Section2 = {{Chembox Properties
			| N=2|O=3
	| Formula = N<sub>2</sub>O<sub>3</sub>
		⚫	| Appearance = Deep blue liquid
	| MolarMass = 76.01 g/mol
		⚫	| Density = {{ubl|1.447 g/cm<sup>3</sup>, liquid|1.783 g/cm<sup>3</sup>, gas}}
⚫	| Appearance = deep blue liquid
			| MeltingPtC = −100.7<ref name="GW2" />
⚫	| Density = 1.4 g/cm<sup>3</sup>, liquid <br> 1.783 g/cm<sup>3</sup> (gas)
			| BoilingPtC = 3.5
	| MeltingPt = &minus;100.1 °C (173.05 K)
			| BoilingPt_notes = (dissociates<ref name="GW2" />)
	| BoilingPt = 3 °C (276 K)
	| Solubility = very soluble		| Solubility = reacts to form ]
			| SolubleOther = soluble in ]
			| MagSus = −16.0·10<sup>−6</sup> cm<sup>3</sup>/mol
	}}		}}
	| Section3 = {{Chembox Structure		| Section3 = {{Chembox Structure
	| MolShape = planar, ''C''<sub>s</sub>		| MolShape = planar, ''C''<sub>s</sub>
	| Dipole =		| Dipole = 2.122 D
	}}		}}
	| Section4 = {{Chembox Thermochemistry		| Section4 = {{Chembox Thermochemistry
	| DeltaHf = +91.20 kJ/mol		| DeltaHf = 91.20 kJ/mol
	| Entropy = 314.63 J&thinsp;K<sup>&minus;1</sup>&thinsp;mol<sup>&minus;1</sup>		| Entropy = 314.63 J/(mol·K)
			| HeatCapacity = 65.3 J/(mol·K)
	}}		}}
	| Section7 = {{Chembox Hazards		| Section7 = {{Chembox Hazards
	| ExternalMSDS =		| ExternalSDS =
			| GHS_ref=<ref>{{cite web |title=Dinitrogen trioxide |url=https://pubchem.ncbi.nlm.nih.gov/compound/61526#section=Safety-and-Hazards |website=pubchem.ncbi.nlm.nih.gov |access-date=23 December 2021 |language=en}}</ref>
	| EUIndex = Not listed
			| GHSPictograms = {{GHS03}}{{GHS05}}{{GHS06}}
	| EUClass = Highly toxic ('''T+''')
	| RPhrases =		| GHSSignalWord = Danger
			| HPhrases = {{H-phrases|H270|H310+H330|H314}}
	| SPhrases =
			| PPhrases = {{P-phrases|220|244|260|262|264|270|271|280|284|301+330+331|302+350|303+361+353|304+340|305+351+338|310|320|321|322|361|363|370+376|403|403+233|405|410+403|501}}
	| MainHazards =
	| NFPA-H = 3		| MainHazards =
	| NFPA-F = 0		| NFPA-H = 4
	| NFPA-R = 0		| NFPA-F = 0
	| NFPA-O = OX		| NFPA-R = 2
	| FlashPt = Non-flammable		| NFPA-S = OX
			| FlashPt = Non-flammable
	}}		}}
	| Section8 = {{Chembox Related		| Section9 = {{Chembox Related
	| OtherFunctn = ]<br/>]<br/>]<br/>]<br/>]<br/>]		| OtherCompounds = {{ubl|]|]|]|]|]|]|]|]}}
	| Function = ] ]s
	| OtherCpds = ]
	}}		}}
	}}		}}
	'''Dinitrogen trioxide''' is the ] with the ] N<sub>2</sub>O<sub>3</sub>. This deep blue ] is one of binary ]s. It forms upon mixing equal parts of ] and ] and cooling the mixture below &minus;21&nbsp;°C (&minus;6&nbsp;°F):<ref name="G&E">{{Greenwood&Earnshaw1st|pages=521–22}}</ref>		'''Dinitrogen trioxide''' (also known as '''nitrous anhydride''') is the ] with the ] {{chem2|N2O3|auto=1}}. It is a ]. It forms upon mixing equal parts of ] and ] and cooling the mixture below −21&nbsp;°C (−6&nbsp;°F):<ref name="G&E">{{Greenwood&Earnshaw1st|pages=521–22}}</ref>
	:NO + NO<sub>2</sub> {{eqm}} N<sub>2</sub>O<sub>3</sub>		:{{chem|•|NO}} + {{chem|•|NO|2}} {{Eqm}} {{chem|N|2|O|3}}
	Dinitrogen trioxide is only isolable at low temperatures, i.e. in the liquid and solid ]. At higher temperatures the equilibrium favors the constituent gases, with ''K''<sub>diss</sub>&nbsp;= 193&nbsp;kPa (25&nbsp;°C).<ref>{{Holleman&Wiberg}}</ref>		Dinitrogen trioxide is only isolable at low temperatures (i.e., in the liquid and solid ]). In liquid and solid states, it has a deep blue color.<ref name=GW2>{{Greenwood&Earnshaw2nd|page=444}}</ref> At higher temperatures the equilibrium favors the constituent gases, with ]&nbsp;= 193&nbsp;kPa (25&nbsp;°C).<ref>{{Holleman&Wiberg}}</ref>{{cln|reason=The unit of mrasurement of a dissociatio n constant is not kPa! And you failed to tell to the readers what is the vslue of the |date=June 2023}}
			This compound is sometimes called "nitrogen trioxide", but this name properly refers to another compound, the (uncharged) ] {{chem2|•NO3}}.
⚫	==Structure and bonding==
⚫	Dinitrogen trioxide has an unusually long N–N bond at 186 pm. Whereas N–N bonds are more often similar to that in ] (145 pm), some other oxides of nitrogen do possess long N–N bonds, including dinitrogen tetroxide (175 pm). The N<sub>2</sub>O<sub>3</sub> molecule is planar and exhibits Cs symmetry. The dimensions displayed below come from microwave spectroscopy of low-temperature, gaseous N<sub>2</sub>O<sub>3</sub>:<ref name="G&E" />
⚫	<center>
⚫	]
	</center>
	It is the anhydride of the unstable nitrous acid (HNO<sub>2</sub>), and produces it when mixed into water. An alternative structure might be anticipated for the true anhydride, i.e. O=N–O–N=O, but this isomer is not observed. 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 N<sub>2</sub>O<sub>3</sub> to solutions of bases:
	:N<sub>2</sub>O<sub>3</sub> + 2 NaOH → 2 NaN<sub></sub>O<sub>2</sub> + H<sub>2</sub>O
		⚫	== Structure and bonding ==
⚫	==References==
			Dinitrogen trioxide molecule contains an ]–N bond. One of the numerous ] of the molecule of dinitrogen trioxide is {{chem2|O\dN\sNO2}}, which can be described as a ] {{chem2|\sN\dO}} attached to a ] {{chem2|\sNO2}} by a ] between the two ] atoms. This ] is considered as the "]" of the unstable ] ({{chem2|HNO2}}), and produces it when mixed with ], although an alternative structure might be anticipated for the true anhydride of nitrous acid (i.e., {{chem2|O\dN\sO\sN\dO}}). This isomer can be produced from the reaction of ] and ] in ] solution at -30°C.<ref>{{cite journal | last=Reddy | first=G. Sudhakar | last2=Suh | first2=Elijah J. | last3=Corey | first3=E. J. | title=Nitrosyl Triflate and Nitrous Anhydride, Same Mode of Generation, but Very Different Reaction Pathways. Direct Synthesis of 1,2-Oxazetes, Nitroso or Bisoxazo Compounds from Olefins | journal=Organic Letters | volume=24 | issue=23 | date=2022-06-17 | issn=1523-7052 | pmid=35653176 | doi=10.1021/acs.orglett.2c01466 | pages=4202–4206}}</ref>
			If the nitrous acid is not then used up quickly, it decomposes into ] and ]. ] salts are sometimes produced by adding {{chem2|N2O3}} to water solutions of ]:
			:{{chem2|N2O3 + 2 NaOH → 2 NaNO2 + H2O}}
		⚫	Typically, N–N bonds are similar in length to that in ] (145 ]). Dinitrogen trioxide, however, has an unusually long N–N bond at 186 pm. Some other ]s also possess long N–N bonds, including ] (175 pm). The {{chem2|N2O3}} molecule is ] and exhibits ]. The dimensions displayed on the picture below come from ] of ], ]eous {{chem2|N2O3}}:<ref name="G&E" />
		⚫	{{center|
		⚫	]
			}}Similar to ], this molecule can also co-exist in equilibrium with an ionic gas called nitrosonium nitrite (<sup>+</sup><sup>–</sup>) <ref>{{Cite journal |last=Zakharov |first=I. I. |last2=Zakharova |first2=O. I. |date=2009-04-01 |title=Nitrosonium nitrite isomer of N2O3: Quantum-chemical data |url=https://doi.org/10.1007/s10947-009-0031-1 |journal=Journal of Structural Chemistry |language=en |volume=50 |issue=2 |pages=212–218 |doi=10.1007/s10947-009-0031-1 |issn=1573-8779}}</ref>
			:
		⚫	== References ==
	{{reflist}}		{{reflist}}
	==External links==		== External links ==
	*		*
	*		*
	*		* {{Webarchive|url=https://web.archive.org/web/20190731015132/http://www.c-f-c.com/supportdocs/nitrogen_oxi.htm |date=2019-07-31 }}
	*		*
			{{nitrogen compounds}}
⚫	]
	]		{{oxygen compounds}}
			{{Oxides}}
		⚫	]
	]		]
	]		]
	]		]
	]
	]
	]
	]
	]
	]
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