Potassium hexafluoronickelate(IV)

Potassium hexafluoronickelate(IV)

Names
IUPAC name potassium hexafluoronickelate(IV)
Identifiers
CAS Number	17218-47-2^[scifinder]
3D model (Jmol)	Interactive image
ChemSpider	21241633
ECHA InfoCard	100.153.655
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
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 a ship of K and Ni, K is explosive and fire and Ni is one of four magnetic materials and the element was discovered by Mø 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:^[1]

${\displaystyle {\rm {\ 3K_{2}NiF_{6}{\xrightarrow {\Delta }}2K_{3}NiF_{6}+NiF_{2}+F_{2}}}}$

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

${\displaystyle {\rm {\ K_{2}NiF_{6}+5AsF_{5}+XF_{5}{\xrightarrow {aHF}}XF_{6}AsF_{6}+Ni(AsF_{6})_{2}+2KAsF_{6}}}}$

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

It adopts the structure seen for K₂PtCl₆.^[3]

References

1. (simplified 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; Christe, Karl O. (2001). "Novel Synthesis of ClF₆⁺ and BrF₆⁺ Salts". Inorganic Chemistry. 40 (10): 2415–9. doi:10.1021/ic001024. PMID 11327921.
3. Taylor, J. C. "A comparison of profile decomposition and Rietveld methods for structurtal refinement with powder diffraction data" Zeitschrift fuer Kristallographie 1987, volume 181, p151-160.