Potassium hexafluoronickelate(IV)

Potassium hexafluoronickelate(IV)

Names
IUPAC name potassium hexafluoronickelate(IV)
Identifiers
CAS Number	17218-47-2 Y[scifinder]
ChemSpider	21241633
Jmol 3D model	Interactive image
InChI InChI=1S/6FH.2K.Ni/h6*1H;;;/q;;;;;;2*+1;+4/p-6
SMILES [K+].[K+].F[Ni-2](F)(F)(F)(F)F
Properties
Chemical formula	K2NiF6
Molar mass	250.880
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium hexafluoronickelate(IV) is an inorganic compound with the chemical formula K
₂NiF
₆. It can be produced through the reaction of potassium fluoride, nickel dichloride, and fluorine.

It reacts violently with water, releasing oxygen. It dissolves in anhydrous hydrogen fluoride to produce a light-red solution. Potassium hexafluoronickelate(IV) decomposes at 350 °C, forming potassium hexafluoronickelate(III), nickel(II) fluoride, and fluorine:

$\rm \ 3 K_2NiF_6 \xrightarrow{\Delta} 2 K_3NiF_6 + NiF_2 + F_2$

Potassium hexafluoronickelate is a very strong oxidant. It can turn chlorine pentafluoride and bromine pentafluoride into ClF⁺
₆ and BrF⁺
₆, respectively:

$\rm \ K_2NiF_6 + 5 AsF_5 + XF_5 \xrightarrow{aHF} XF_6AsF_6 + Ni(AsF_6)_2 + 2KAsF_6$

( X = Cl or Br , -60 °C , aHF = anhydrous hydrogen fluoride )