Silver hexafluorophosphate

Silver hexafluorophosphate

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Section1 = Chembox Identifiers
CASNo = 26042-63-7
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Section2 = Chembox Properties
Formula = AgPF6
MolarMass = 252.83 g/mol
Appearance = Off-white powder
Density =
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Solubility = organic solvents

Section3 = Chembox Hazards
ExternalMSDS = [https://fscimage.fishersci.com/msds/84927.htm External MSDS]
EUClass = Corrosive (C)
NFPA-H = 3
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RPhrases = R34

Silver hexafluorophosphate, commonly referred to "silver PF-6," is an inorganic compound with the formula AgPF6. This salt is a commonly encountered reagent in inorganic and organometallic chemistry. It is commonly used to replace halide ligands with the weakly-coordinating hexafluorophosphate anion. The abstraction of the halide is driven by the precipitation of the appropriate silver halide. Illustrative is the preparation of acetonitrile complexes from a metal bromide, a reaction that would typically be conducted in a solution of acetonitrile: :AgPF6 + Re(CO)5Br + CH3CN → AgBr + [Re(CO)5(CH3CN)] PF6

As a solution in dichloromethane, AgPF6 is a very strong oxidant, forming silver metal as a by-product: [Connelly, N. G. and Geiger, W. E., "Chemical Redox Agents for Organometallic Chemistry", Chem. Rev., 1996, 96, 877-922.doi|10.1021/cr940053x] :AgPF6 + Fe(C5H5)2 → Ag + [Fe(C5H5)2] PF6 "E" = 0.65 V

Related reagents

In terms of their properties and applications, the tetrafluoroborate AgBF4 and the hexafluoroantimonate AgSbF6 are similar to AgPF6.

Comparison with silver nitrate

Silver nitrate is a traditional and less expensive halide abstraction reagent, as indicated by its widespread use in qualitative tests for halides. Relative to AgPF6, silver nitrate is poorly soluble in weakly basic solvents, however. More seriously, nitrate is Lewis basic and hence presents an interfering ligand that precludes its use in stringent applications.

References


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