Phosphorus trioxide

Phosphorus trioxide is the chemical compound with the molecular formula P4O6. Although the molecular formula suggests the name tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the compound's molecular structure, and its usage continues today. This colorless solid is structurally related to adamantane. It is formally the anhydride of phosphorous acid, H3PO3, but cannot be obtained by the dehydration of the acid. A white solid that melts at room temperature, it is waxy, crystalline and highly toxic, with garlic odor.

Phosphorus(III) oxide

Phosphorus in orange, oxygen in red
Names
Other names
Phosphorus sesquioxide
Phosphorous anhydride
Tetraphosphorous hexoxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.032.414
EC Number
  • 235-670-5
26856
UNII
  • InChI=1S/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9 Y
    Key: VSAISIQCTGDGPU-UHFFFAOYSA-N Y
  • InChI=1/O6P4/c1-7-2-9-4-8(1)5-10(3-7)6-9
    Key: VSAISIQCTGDGPU-UHFFFAOYAV
  • O1P3OP2OP(OP1O2)O3
Properties
P4O6
Molar mass 219.88 g mol−1
Appearance colourless monoclinic crystals or liquid
Density 2.135 g/cm3
Melting point 23.8 °C (74.8 °F; 296.9 K)
Boiling point 173.1 °C (343.6 °F; 446.2 K)
reacts
Acidity (pKa) 9.4
Structure
See Text
0
Hazards
GHS labelling:
Danger
NFPA 704 (fire diamond)
3
0
0
Related compounds
Other anions
 Phosphorus trisulfide
Other cations
 Dinitrogen trioxide
Arsenic trioxide
Antimony trioxide
Related compounds
 Phosphorus pentoxide
Phosphorous acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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