Potassium hexafluoronickelate

Potassium hexafluoronickelate
IUPAC name potassium hexafluoronickelate
Identifiers
ChemSpider	21241633
Jmol-3D images	Image 1
SMILES [K+].[K+].F[Ni-2](F)(F)(F)(F)F
InChI InChI=InChI=1S/6FH.2K.Ni/h6*1H;;;/q;;;;;;2*+1;+4/p-6
Properties
Molecular formula	K2NiF6
Molar mass	250.880
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Potassium hexafluoronickelate is an inorganic compound with the chemical formula K₂NiF₆. It can be produced through the reaction of potassium fluoride, nickel dichloride, and fluorine.

It reacts with water violently, with oxygen released. It dissolves in anhydrous hydrogen fluoride to produce a light-red solution. Potassium hexafluoronickelate decomposes while heated at 350 °C:^[1]

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

Potassium hexafluoronickelate is a strong oxidant. It can turn chlorine pentafluoride and bromine pentafluoride into ClF+
6 and BrF+
6, respectively:^[2]

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

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

References

1. ^ (Chinese)张青莲. 《无机化学丛书》第九卷：锰分族、铁系、铂系. 北京: 科学出版社. pp. P333. ISBN 7-03-002238-6. 
2. ^ Schroer, Thorsten (2001-04-30). "Novel Synthesis of of ClF6+ and BrF6+ Salts". Inorganic Chemistry 40 (10): 2415–2419. doi:10.1021/ic001024.