Phosphorus Tetroxide

Phosphorus tetroxide
Names
	Other names Phosphorus tetroxide ; Phosphorus(V) oxide; Phosphoric anhydride
Identifiers
CAS Number	12137-38-1 ; (P4O7): 12065-80-4; (P4O8): 12037-06-8 ; (P4O9): 12037-11-5;
3D model (JSmol)	Interactive image; (P4O7): Interactive image; (P4O8): Interactive image; (P4O9): Interactive image;
ChemSpider	17287784 ; (P4O7): 122796; (P4O8): 122793; (P4O9): 122794;
PubChem CID	16131071; (P4O7): 139226; (P4O8): 139223; (P4O9): 139224;
CompTox Dashboard (EPA)	DTXSID50153252 ; (P4O8): DTXSID10152822; (P4O9): DTXSID70152823;
	InChI InChI=1S/O4P2/c1-5-4-6(2)3 Key: PKSMWOJZXCKNBJ-UHFFFAOYSA-N; (P4O7): InChI=1S/O7P4/c1-11-5-8-2-9(6-11)4-10(3-8)7-11 Key: JXMJWGUWYVJTGA-UHFFFAOYSA-N; (P4O8): InChI=1S/O8P4/c1-11-4-9-3-10(5-11)7-12(2,6-9)8-11 Key: BDFGQAKHAFFJCF-UHFFFAOYSA-N; (P4O9): InChI=1S/O9P4/c1-11-4-10-5-12(2,7-11)9-13(3,6-10)8-11 Key: DKJKPKZTNXPRRP-UHFFFAOYSA-N;
	SMILES O=POP(=O)=O; (P4O7): O=P12OP3OP(O1)OP(O3)O2; (P4O8): O=P12OP3OP(O1)OP(=O)(O3)O2; (P4O9): O=P12OP3OP(=O)(O1)OP(=O)(O3)O2;
Properties
Chemical formula	P2O4
Molar mass	125.96 g·mol−1
Appearance	Solid
Melting point	>100 °C
Vapor pressure	2.54 g·cm−3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It has the empirical chemical formula P₂O₄. Solid phosphorus tetroxide (also referred to as phosphorus(III,V)-oxide) consists of variable mixtures of the mixed-valence oxides P₄O₇, P₄O₈ and P₄O₉.

Preparation

Phosphorus tetroxide can be produced by thermal decomposition of phosphorus trioxide, which disproportionates above 210 °C to form phosphorus tetroxide, with elemental phosphorus as a byproduct:

{\ce {8P2O3 <=> P4 + 6P2O4}}

In addition, phosphorus trioxide can be converted into phosphorus tetroxide by controlled oxidation with oxygen in carbon tetrachloride solution.

Careful reduction of phosphorus pentoxide with red phosphorus at 450-525 °C also produces phosphorus tetroxide.

References

This article uses material from the Wikipedia English article Phosphorus tetroxide, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
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Phosphorus Tetroxide

Preparation

References

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Names
Other names Phosphorus tetroxide Phosphorus(V) oxide Phosphoric anhydride
Identifiers
CAS Number	12137-38-1^Y (P₄O₇): 12065-80-4 (P₄O₈): 12037-06-8^N (P₄O₉): 12037-11-5
3D model (JSmol)	Interactive image (P₄O₇): Interactive image (P₄O₈): Interactive image (P₄O₉): Interactive image
ChemSpider	17287784^Y (P₄O₇): 122796 (P₄O₈): 122793 (P₄O₉): 122794
PubChem CID	16131071 (P₄O₇): 139226 (P₄O₈): 139223 (P₄O₉): 139224
CompTox Dashboard (EPA)	DTXSID50153252 (P₄O₈): DTXSID10152822 (P₄O₉): DTXSID70152823
InChI InChI=1S/O4P2/c1-5-4-6(2)3 Key: PKSMWOJZXCKNBJ-UHFFFAOYSA-N (P₄O₇): InChI=1S/O7P4/c1-11-5-8-2-9(6-11)4-10(3-8)7-11 Key: JXMJWGUWYVJTGA-UHFFFAOYSA-N (P₄O₈): InChI=1S/O8P4/c1-11-4-9-3-10(5-11)7-12(2,6-9)8-11 Key: BDFGQAKHAFFJCF-UHFFFAOYSA-N (P₄O₉): InChI=1S/O9P4/c1-11-4-10-5-12(2,7-11)9-13(3,6-10)8-11 Key: DKJKPKZTNXPRRP-UHFFFAOYSA-N
SMILES O=POP(=O)=O (P₄O₇): O=P12OP3OP(O1)OP(O3)O2 (P₄O₈): O=P12OP3OP(O1)OP(=O)(O3)O2 (P₄O₉): O=P12OP3OP(=O)(O1)OP(=O)(O3)O2
Properties
Chemical formula	P₂O₄
Molar mass	125.96 g·mol⁻¹
Appearance	Solid
Melting point	>100 °C
Vapor pressure	2.54 g·cm⁻³
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references