Potassium hexafluoronickelate(IV) is an inorganic compound with the chemical formulaK 2NiF 6. It can be produced through the reaction ofpotassium fluoride,nickel dichloride, andfluorine.
It reacts violently with water, releasing oxygen. It dissolves in anhydroushydrogen fluoride to produce a light-red solution. Potassium hexafluoronickelate(IV) decomposes at 350 °C, forming potassium hexafluoronickelate(III),nickel(II) fluoride, andfluorine:[2][better source needed][3]
Chemical structure of solid K2NiF6 as determined by X-ray crystallography.
( X = Cl or Br , -60 °C , aHF = anhydrous hydrogen fluoride).
Potassium hexafluoronickelate decomposes at high temperatures to release fluorine gas; liketerbium(IV) fluoride, the emitted fluorine is primarily monatomic rather than the typical diatomic.[5]
It adopts the structure seen for K2PtCl6 and Mg2FeH6.[6]
^Schroer, Thorsten; Christe, Karl O. (2001). "Novel Synthesis of ClF6+ and BrF6+ Salts".Inorganic Chemistry.40 (10):2415–9.doi:10.1021/ic001024.PMID11327921.
^Rau, J. V.; Chilingarov, N. S.; Leskiv, M. S.; Sukhoverkhov, V. F.; Rossi Albertini, V.; Sidorov, L. N. (August 2001). "Transition and rare earth metal fluorides as thermal sources of atomic and molecular fluorine".Le Journal de Physique IV.11 (PR3): Pr3–109–Pr3-113.doi:10.1051/jp4:2001314.
^Taylor, J. C. "A comparison of profile decomposition and Rietveld methods for structurtal refinement with powder diffraction data" Zeitschrift für Kristallographie 1987, volume 181, p151-160.
