Ammonium hexafluorophosphate

Ammonium hexafluorophosphate is the inorganic compound with the formula NH₄PF₆. It is a white water-soluble, hygroscopic solid. The compound is a salt consisting of the ammonium cation and hexafluorophosphate anion. It is commonly used as a source of the hexafluorophosphate anion, a weakly coordinating anion. It is prepared by combining neat ammonium fluoride and phosphorus pentachloride. Alternatively it can also be produced from phosphonitrilic chloride:^[1]

PCl₅ + 6 NH₄F → NH₄PF₆ + 5 NH₄Cl

PNCl₂ + 6 HF → NH₄PF₆ + 2 HCl

Ammonium hexafluorophosphate

Ball-and-stick model of the ammonium cation Ball-and-stick model of the hexafluorophosphate anion
Names
IUPAC name ammonium hexafluorophosphate
Identifiers
CAS Number	16941-11-0 Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	7969679 Y
ECHA InfoCard	100.037.266
EC Number	241-009-1
PubChem CID	9793912
UNII	NS308031PJ
CompTox Dashboard (EPA)	DTXSID00884948
InChI InChI=1S/F6P.H3N/c1-7(2,3,4,5)6;/h;1H3/q-1;/p+1 Y Key: NIZXKAYXSNUDOU-UHFFFAOYSA-O Y InChI=1/F6P.H3N/c1-7(2,3,4,5)6;/h;1H3/q-1;/p+1 Key: NIZXKAYXSNUDOU-IKLDFBCSAF
SMILES [NH4+].F[P-](F)(F)(F)(F)F F[P-](F)(F)(F)(F)F.[NH4+]
Properties
Chemical formula	(NH4)[PF6]
Molar mass	163.00264
Appearance	white solid
Density	2.180 g/cm3
Solubility in water	74.8 g/100 mL(20 °C)
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Safety data sheet (SDS)	Oxford MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

References

1. W. Kwasnik (1963). "Ammonium Hexafluorophosphate (V)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. pp. 195–196.