Phosphorus dioxide (PO2) is a gaseous oxide of phosphorus. It is a free radical that plays a role in the chemiluminescence of phosphorus and phosphine.[1] It is produced when phosphates are heated to high temperatures.[2]

Phosphorus dioxide
Names
IUPAC name
Phosphorus(IV) oxide
Other names
Phosphorus dioxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
1065
  • InChI=1S/O2P/c1-3-2
    Key: CJDZTJNITSFKRE-UHFFFAOYSA-N
  • O=P[O]
Properties
O2P
Molar mass 62.972 g·mol−1
ThermochemistryCRC Handbook of Chemistry and Physics, 2005
39.5 joules (9.4 cal) per mole per K
252.1 joules (60.3 cal) per mole per K
−279.9 joules (−66.9 cal) per mole
−281.6 joules (−67.3 cal) per mole
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

In the ground state the molecule is bent, like nitrogen dioxide, but there is an excited state that is linear.[1]

References

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  1. ^ a b Lawrence L. Lohr (Jul 2, 1984). "A theoretical study of the gaseous oxides PO2 and PO, their anions, and their role in the combustion of phosphorus and phosphine". The Journal of Physical Chemistry. doi:10.1021/j150667a022.
  2. ^ Bing Deng; et al. (Feb 9, 2022). "Rare earth elements from waste". Science Advances. 8 (6). doi:10.1126/sciadv.abm3132. PMC 8827657.