Difluorophosphate

Difluorophosphate

Names
Systematic IUPAC name Difluorophosphate
Identifiers
CAS Number	7238-93-9
3D model (JSmol)	Interactive image
ChemSpider	4417671
PubChem CID	5250558
InChI InChI=1S/F2HO2P/c1-5(2,3)4/h(H,3,4)/p-1 Key: DGTVXEHQMSJRPE-UHFFFAOYSA-M InChI=1/F2HO2P/c1-5(2,3)4/h(H,3,4)/p-1 Key: DGTVXEHQMSJRPE-REWHXWOFAH
SMILES [O-]P(=O)(F)F
Properties
Chemical formula	PO 2F− 2
Molar mass	100.97 g mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N (what is YN ?)
Infobox references

Difluorophosphate or difluorodioxophosphate or phosphorodifluoridate is an anion with formula PO
2F−
2. It has a single negative charge and resembles perchlorate (ClO−
4) and monofluorosulfonate (SO₃F⁻) in shape and compounds. These ions are isoelectronic, along with tetrafluoroaluminate, phosphate, orthosilicate, and sulfate. It forms a series of compounds. The ion is toxic to mammals as it causes blockage to iodine uptake in the thyroid. However it is degraded in the body over several hours.

Compounds containing difluorophosphate may have it as a simple uninegative ion, it may function as a difluorophosphato ligand where it is covalently bound to one or two metal atoms, or go on to form a networked solid. It may be covalently bound to a non metal or an organic moiety to make an ester or an amide.

The ammonium salt of difluorophosphate is formed from reacting phosphorus pentoxide with ammonium fluoride. This was how the ion was first made by its discoverer, Willy Lange, in 1929.

Alkali chlorides can react with dry difluorophosphoric acid to form alkali metal salts.

NaCl + HPO₂F₂ → NaPO₂F₂ + HCl (gas)

Fluorination of dichlorophosphates can produce difluorophosphates. Another method is fluorination of phosphates or polyphosphates.

Trimethylsilyl difluorophosphate reacts with metal chlorides to make difluorophosphates.

The anhydride phosphoryl difluoride oxide (P₂O₃F₄) can react with oxides such as UO₃ to yield difuorophosphates. Phosphoryl difluoride oxide also reacts with alkali fluorides to yield difluorophosphates.

In ammonium difluorophosphate the difluorophosphate ion has these interatomic dimensions: P–O length 1.457 Å, P–F length 1.541 Å, O–P–O angle 118.7°, F–P–O 109.4° and F–P–F angle 98.6°. Hydrogen bonding from ammonium to oxygen atoms causes a change to the difluorophosphate ion in the ammonium salt. In potassium difluorophosphate the ion has dimensions: P–O length 1.470 Å, P–F length 1.575 Å, O–P–O angle 122.4°, F–P–O 108.6° and F–P–F angle 97.1°.