Phosphoryl fluoride

Phosphoryl fluoride (also called phosphorus oxyfluoride) is a compound with the chemical formula POF₃. It is a colorless gas that is hydrolyzed in aqueous solution, passing through difluorophosphate and monofluorophosphate to give ultimately orthophosphate.

Phosphoryl fluoride

Names
IUPAC names Phosphoryl trifluoride Phosphorus trifluoride oxide
Other names Phosphorus oxyfluoride Phosphorus oxide trifluoride Phosphorus(V) oxide trifluoride Trifluorophosphine oxide Trifluorophosphine P-oxide
Identifiers
CAS Number	13478-20-1
3D model (JSmol)	Interactive image Interactive image
ChemSpider	75351
ECHA InfoCard	100.033.419
EC Number	236-776-4
PubChem CID	83516
UNII	J2907TX5WS
CompTox Dashboard (EPA)	DTXSID1065504
InChI InChI=1S/F3OP/c1-5(2,3)4 Key: FFUQCRZBKUBHQT-UHFFFAOYSA-N InChI=1/F3OP/c1-5(2,3)4 Key: FFUQCRZBKUBHQT-UHFFFAOYAJ
SMILES F[P+](F)(F)[O-] FP(F)(F)=O
Properties
Chemical formula	POF3
Molar mass	103.9684 g/mol
Appearance	Colourless gas
Boiling point	−39.7 °C (−39.5 °F; 233.5 K)
Solubility in water	Reacts
Solubility	Reacts with alcohol and acid, soluble in diethyl ether and hydrocarbons
Dipole moment	1.76 D[1]
Structure
Molecular shape	Tetrahedral at the P atom
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Poison, corrosive, can form HF on contact with H2O
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H330, H372
Precautionary statements	P260, P264, P270, P271, P280, P284, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P314, P320, P321, P330, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 2
Safety data sheet (SDS)	ICSC 0190
Related compounds
Related compounds	Phosphoryl chloride Phosphoryl chloride difluoride Phosphoryl bromide Thiophosphoryl fluoride Thiophosphoryl chloride Thiophosphoryl chloride difluoride Phosphorus trifluoride Phosphorus pentafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis and reactions

Phosphorus oxyfluoride is prepared by partial hydrolysis of phosphorus pentafluoride.

Phosphorus oxyfluoride is the progenitor of the simple fluorophosphoric acids by hydrolysis. The sequence starts with difluorophosphoric acid:

POF₃ + H₂O → HPO₂F₂ + HF

The next steps give monofluorophosphoric acid and phosphoric acid:

HPO₂F₂ + H₂O → H₂PO₃F + HF

H₂PO₃F + H₂O → H₃PO₄ + HF

Phosphoryl fluoride combines with dimethylamine to produce dimethylaminophosphoryl difluoride (H₃C−)₂N−P(=O)F₂ and difluorophosphate and hexafluorophosphate ions^[2] (as dimethylammonium salts). The tendency of phosphoryl fluoride toward disproportionation into those ions is not, of course, paralleled by the chloride.