Phosphorus tetroxide : Preparation Wikipedia, the free encyclopedia

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)	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

Chemical compound

Diphosphorus tetroxide, or phosphorus tetroxide is an inorganic compound of phosphorus and oxygen. 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.^[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:

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

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

^ http://www.wiley.com/college/math/chem/cg/sales/voet.html. Archived 2016-03-03 at the Wayback Machine
^ Alberts B.; et al. (2002). Molecular Biology of the Cell, 4th Ed. Garland Science. ISBN 978-0-8153-4072-0.
^ Voet D., Voet J. G. (2004-03-09). Biochemistry, 3rd Ed. Wiley. ISBN 978-0-471-19350-0.
^ Atkins P., de Paula J. (2006). Physical chemistry, 8th Ed. San Francisco: W. H. Freeman. ISBN 978-0-7167-8759-4.
^ 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. LCCN 2001032331. OCLC 46872308.
^ Laidler K. J. (1978). Physical chemistry with biological applications. Benjamin/Cummings. Menlo Park. ISBN 978-0-8053-5680-9.{{cite book}}: CS1 maint: location missing publisher (link)