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			{{Short description|Chemical compound}}
	{{chembox		{{chembox
			| Watchedfields = changed
	| verifiedrevid = 444052346		| verifiedrevid = 444053776
⚫	| Name = Phosphorus trioxide
	| ImageFile = Phosphorus-trioxide-from-xtal-3D-balls.png		| Name = Phosphorus(III) oxide
			| ImageFile = Phosphorus-trioxide-from-xtal-3D-balls.png
	| ImageName = Ball-and-stick model of the P4O6 molecule		| ImageName = Ball-and-stick model of the P4O6 molecule
	| ImageFile1 = Phosphorus-trioxide-xtal-3D-balls-A.png		| ImageCaption = Phosphorus in orange, oxygen in red
		⚫	| ImageFile1 = Phosphorus-trioxide-xtal-3D-balls-A.png
	| ImageName1 = Packing of P4O6 molecules in the crystal structure		| ImageName1 = Packing of P4O6 molecules in the crystal structure
⚫	| OtherNames = Phosphorus(III) oxide,<br />Phosphorus ],<br />Phosphorous oxide,<br />Phosphorous anhydride
			|IUPACName=Tetraphosphorus hexaoxide<br>Tricyclotetraphosphoxane
⚫	| Section1 = {{Chembox Identifiers
			|SystematicName=2,4,6,8,9,10-Hexaoxa-1,3,5,7-tetraphosphatricyclodecane
⚫	| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
		⚫	| OtherNames = Phosphorus ]<br />Phosphorous anhydride<br />Tetraphosphorous hexoxide
		⚫	|Section1={{Chembox Identifiers
		⚫	| CASNo_Ref = {{cascite|correct|??}}
		⚫	| CASNo = 1314-24-5
			| ChEBI_Ref = {{ebicite|correct|EBI}}
		⚫	| ChEBI = 37372
		⚫	| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
	| ChemSpiderID = 109897		| ChemSpiderID = 109897
			| EC_number = 235-670-5
			| Gmelin = 26856
		⚫	| PubChem = 123290
			| UNII_Ref = {{fdacite|correct|FDA}}
			| UNII = 0LTR52K7HK
	| InChI = 1/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9		| InChI = 1/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9
	| InChIKey = VSAISIQCTGDGPU-UHFFFAOYAV		| InChIKey = VSAISIQCTGDGPU-UHFFFAOYAV
⚫	| ChEBI_Ref = {{ebicite|correct|EBI}}
⚫	| ChEBI = 37372
⚫	| SMILES = O1P3OP2OP(OP1O2)O3
	| StdInChI_Ref = {{stdinchicite|correct|chemspider}}		| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
	| StdInChI = 1S/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9		| StdInChI = 1S/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9
	| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}		| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
	| StdInChIKey = VSAISIQCTGDGPU-UHFFFAOYSA-N		| StdInChIKey = VSAISIQCTGDGPU-UHFFFAOYSA-N
		⚫	| SMILES = O1P3OP2OP(OP1O2)O3
⚫	| CASNo = 1314-24-5
⚫	| PubChem = 123290
	}}		}}
	| Section2 = {{Chembox Properties		|Section2={{Chembox Properties
	| Formula = P<sub>4</sub>O<sub>6</sub>		| Formula = P<sub>4</sub>O<sub>6</sub>
	| MolarMass = 219.88 g mol<sup>−1</sup>		| MolarMass = 219.88 g mol<sup>−1</sup>
	| Appearance = colourless monoclinic crystals or liquid		| Appearance = colourless monoclinic crystals or liquid
	| Density = 2.135 g/cm<sup>3</sup>		| Density = 2.135 g/cm<sup>3</sup>
	| Solubility = reacts		| Solubility = reacts
	| MeltingPt = 23.8 °C		| MeltingPtC = 23.8
	| BoilingPt = 173.1 °C		| BoilingPtC = 173.1
	| pKa = 9.2		| pKa = 9.4
	| pKb =		| pKb =
	}}		}}
	| Section3 = {{Chembox Structure		|Section3={{Chembox Structure
	| MolShape = '''See Text'''		| MolShape = '''See Text'''
	| CrystalStruct =		| CrystalStruct =
	| Dipole = 0		| Dipole = 0
	}}		}}
	| Section4 = {{Chembox Thermochemistry		|Section7={{Chembox Hazards
	| DeltaHf =		| ExternalSDS =
			| GHSPictograms = {{GHS06}}
	| Entropy =
			| GHSSignalWord = Danger
⚫	}}
			| HPhrases = {{H-phrases|}}
	| Section5 = {{Chembox Pharmacology
			| PPhrases = {{P-phrases|}}
	| ProteinBound =}}
		⚫	| NFPA-H = 3
	| Section7 = {{Chembox Hazards
		⚫	| NFPA-F = 0
	| ExternalMSDS =
	| EUClass =		| NFPA-R = 0
	| NFPA-H =		| GHS_ref =
		⚫	}}
⚫	| NFPA-F =
		⚫	|Section8={{Chembox Related
⚫	| NFPA-R =
		⚫	| OtherAnions = ]
	| RPhrases =
		⚫	| OtherCations = ]<br />]<br />]
	| SPhrases =
		⚫	| OtherCompounds = ]<br />]
	}}
⚫	| Section8 = {{Chembox Related
⚫	| OtherAnions = ]
⚫	| OtherCations = ]<br />]<br />]
⚫	| OtherCpds = ]<br />]
	}}		}}
	}}		}}
	'''Phosphorus trioxide''' is the ] with the molecular formula P<sub>4</sub>O<sub>6</sub>. Although it should properly be named tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the compound's molecular structure, and its usage continues today. This colorless solid is structurally related to ]. It is formally the ] of ], H<sub>3</sub>PO<sub>3</sub>, but cannot be obtained by the dehydration of the acid. It is a white, waxy, crystalline and highly toxic solid<ref name = "Wiberg&Holleman">{{cite book |author=A. F. Holleman; Wiberg, Egon; Wiberg, Nils |title=Inorganic Chemistry |publisher=Academic Press |location=Boston |year=2001 |pages= |isbn=0-12-352651-5 |oclc= |doi= |accessdate=}}</ref> and has an odor similar to that of garlic.{{citation needed|date=October 2010}}		'''Phosphorus trioxide''' is the ] with the molecular formula P<sub>4</sub>O<sub>6</sub>. Although the molecular formula suggests the name tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the compound's molecular structure, and its usage continues today. This colorless solid is structurally related to ]. It is formally the ] of ], H<sub>3</sub>PO<sub>3</sub>, but cannot be obtained by the dehydration of the acid. A white solid that melts at room temperature, it is waxy, crystalline and highly toxic, with garlic odor.<ref name = "Wiberg&Holleman">{{cite book |author1=A. F. Holleman |author2=Wiberg, Egon |author3=Wiberg, Nils |title=Inorganic Chemistry |publisher=Academic Press |location=Boston |year=2001 |isbn=0-12-352651-5 }}</ref>
	== Preparation ==		== Preparation ==
	It is obtained by the combustion of phosphorus in a limited supply of air at low temperature.		It is obtained by the combustion of phosphorus in a limited supply of air at low temperatures.
	:P<sub>4</sub>(s) + 3 O<sub>2</sub>(g) → P<sub>4</sub>O<sub>6</sub>(s)		:P<sub>4</sub> + 3 O<sub>2</sub> → P<sub>4</sub>O<sub>6</sub>
	By-products include red phosphorus suboxide.<ref name = "Wiberg&Holleman" />		By-products include red phosphorus suboxide.<ref name = "Wiberg&Holleman" />
	== Chemical Properties ==		== Chemical properties ==
	Phosphorus trioxide reacts with cold water to form phosphorous acid.		Phosphorus trioxide reacts with water to form ], reflecting the fact that it is the anhydride of that acid.<ref>{{Greenwood&Earnshaw2nd}}</ref>
	: P<sub>4</sub>O<sub>6</sub>(s) + 6 H<sub>2</sub>O(l) → 4 H<sub>3</sub>PO<sub>3</sub>(aq)		: P<sub>4</sub>O<sub>6</sub> + 6 H<sub>2</sub>O → 4 H<sub>3</sub>PO<sub>3</sub>
	It reacts vigorously with hot water, via a complex set of reactions, to form ], ], H<sub>3</sub>PO<sub>3</sub> and ].		It reacts with ] to form ] and ].
⚫	P<sub>4</sub>O<sub>6</sub> reacts with ] to form H<sub>3</sub>PO<sub>3</sub> and ].
	: P<sub>4</sub>O<sub>6</sub> + 6 HCl → 2 H<sub>3</sub>PO<sub>3</sub> + 2 PCl<sub>3</sub>		: P<sub>4</sub>O<sub>6</sub> + 6 HCl → 2 H<sub>3</sub>PO<sub>3</sub> + 2 PCl<sub>3</sub>
	With chlorine or bromine it forms the corresponding ], and it reacts with iodine in a sealed tube to from ].<ref name = "Wiberg&Holleman" />		With chlorine or bromine it forms the corresponding ], and it reacts with iodine in a sealed tube to form ].<ref name = "Wiberg&Holleman" />
		⚫	P<sub>4</sub>O<sub>6</sub> reacts with ] at 195 K to give the unstable compound P<sub>4</sub>O<sub>18</sub>.<ref name="InorgChem">.{{cite book
			| title = Inorganic Chemistry, 3rd Edition
			| chapter = Chapter 15: The group 15 elements
			| author1 = Catherine E. Housecroft
			| author2 = Alan G. Sharpe
			| publisher = Pearson
			| year = 2008
			| isbn = 978-0-13-175553-6
			| page = 473
			}}</ref>
			]
			P<sub>4</sub>O<sub>18</sub> decomposes above 238 K in solution with the release of O<sub>2</sub> gas. Decomposition of dry P<sub>4</sub>O<sub>18</sub> is explosive.
			In a ], P<sub>4</sub>O<sub>6</sub> is converted into the mixed P(III)P(V) species P<sub>4</sub>O<sub>8</sub> when heated in a sealed tube at 710 K, with the side product being red phosphorus.<ref name="InorgChem" />
	==As a ligand==		==As a ligand==
		⚫	]
	P<sub>4</sub>O<sub>6</sub> is a ligand for transition metals, comparable to ]. Tetracarbonyl(tetraphosphorus hexaoxide)iron, P<sub>4</sub>O<sub>6</sub>·Fe(CO)<sub>4</sub>, is an example of a complex containing the phosphorus trioxide cage as a ligand. Its molecular structure as determined by single-crystal X-ray diffraction<ref>{{ cite journal | journal = Acta Cryst. | volume = C52 | issue = 11 | month = November | year = 1996 | pages = 2650–2652 | doi = 10.1107/S0108270196004398 | title = Tetracarbonyl(tetraphosphorus hexaoxide)iron | author = M. Jansen and J. Clade }}</ref> is shown below:		P<sub>4</sub>O<sub>6</sub> is a ligand for transition metals, comparable to ]. An illustrative complex is P<sub>4</sub>O<sub>6</sub>·Fe(CO)<sub>4</sub>.<ref>{{ cite journal | journal = Acta Crystallogr. C | volume = 52 | issue = 11 |date=November 1996 | pages = 2650–2652 | doi = 10.1107/S0108270196004398 | title = Tetracarbonyl(tetraphosphorus hexoxide)iron |author1=M. Jansen |author2=J. Clade |name-list-style=amp | doi-access = free }}</ref>
			With ], a dimeric adduct is produced:<ref name="InorgChem" />
			]
			:]
⚫	]
	==References==		==References==
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	{{Phosphorus compounds}}		{{Phosphorus compounds}}
			{{Oxides}}
	{{DEFAULTSORT:Phosphorus Trioxide}}		{{DEFAULTSORT:Phosphorus Trioxide}}
⚫	]
	]		]
			]
		⚫	]
	]
		⚫	]
	]
			]
	]
	]
	]
	]
	]
⚫	]
	]
	]