Phosphorus tetroxide

Phosphorus tetroxide  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)

* (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

Tracking categories (test):

* SizeSet
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Diphosphorus tetroxide, or phosphorus tetroxide is an inorganic compound of phosphorus and oxygen. It has the empirical chemical formula P

4. Solid phosphorus tetroxide (also referred to as phosphorus(III,V)-oxide) consists of variable mixtures of the mixed-valence oxides P4O7, P4O8 and P4O9.[1][2][3]

## 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:

8PA2OA3↽−−⇀PA4+6PA2OA4

In addition, phosphorus trioxide can be converted into phosphorus tetroxide by controlled oxidation with oxygen in carbon tetrachloride solution.[4][5][6]

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

## References

1. ↑ http://www.wiley.com/college/math/chem/cg/sales/voet.html.
2. ↑ Alberts B. (2002). Molecular Biology of the Cell, 4th Ed.. Garland Science. ISBN 978-0-8153-4072-0.
3. ↑ Voet D., Voet J. G. (2004-03-09). Biochemistry, 3rd Ed.. Wiley. ISBN 978-0-471-19350-0.
4. ↑ Atkins P., de Paula J. (2006). Physical chemistry, 8th Ed.. San Francisco: W. H. Freeman. ISBN 978-0-7167-8759-4. https://archive.org/details/atkinsphysicalch00pwat.
5. ↑ Petrucci, Ralph H.; Harwood, William S.; Herring, F. Geoffrey (2002). General chemistry: principles and modern applications (8th ed.). Upper Saddle River, N.J: Prentice Hall. ISBN 978-0-13-014329-7. OCLC 46872308. https://archive.org/details/generalchemistry00hill.
6. ↑ Laidler K. J. (1978). Physical chemistry with biological applications. Benjamin/Cummings. Menlo Park. ISBN 978-0-8053-5680-9.

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Phosphorus compounds

* PBr3
* PBr5
* PCl3
* PCl5
* PF3
* PF5
* PI3
* InP
* PH3
* PN
* P3N5
* P2O3
* P2O4
* P2O5
* P4S3
* P4S10
* AlP
* Ca3P2
* Zn3P2
* CuP2
* HfP
* FeP
* Fe3P
* BP
* YP

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