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]
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| Names | |
|---|---|
| IUPAC name
Phosphorus(IV) oxide
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| Other names
Phosphorus dioxide
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| Identifiers | |
3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| 1065 | |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| O2P | |
| Molar mass | 62.972 g·mol−1 |
| ThermochemistryCRC Handbook of Chemistry and Physics, 2005 | |
Heat capacity (C)
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39.5 joules (9.4 cal) per mole per K |
Std molar
entropy (S⦵298) |
252.1 joules (60.3 cal) per mole per K |
Std enthalpy of
formation (ΔfH⦵298) |
−279.9 joules (−66.9 cal) per mole |
Gibbs free energy (ΔfG⦵)
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−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).
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In the ground state the molecule is bent, like nitrogen dioxide, but there is an excited state that is linear.[1]
References
edit- ^ 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.
- ^ Bing Deng; et al. (Feb 9, 2022). "Rare earth elements from waste". Science Advances. 8 (6). doi:10.1126/sciadv.abm3132. PMC 8827657.
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