Potassium Hexafluoronickelate (IV)

Crystal structure
__ K +      __ Ni 4+      __ F -
General
Surname	Potassium Hexafluoronickelate (IV)
other names	Potassium Nickel (IV) Fluoride Potassium hexafluoroniccolate (IV)
Ratio formula	K 2 [NiF 6 ]
Brief description	red solid
External identifiers / databases
CAS number 17218-47-2 EC number 625-130-0 ECHA InfoCard 100.153.655 Wikidata Q7234713
properties
Molar mass	250.88 g mol −1
Physical state	firmly
density	3.03 g cm −3
solubility	reacts with water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 302-312-317-332-334-350 P: 201-261-280-308 + 313
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium hexafluoronickelate (IV) is an inorganic chemical compound from the group of potassium fluorine complexes .

Extraction and presentation

Potassium hexafluoronickelate (IV) can be obtained by reacting potassium chloride with nickel (II) chloride and fluorine at 275 ° C.

${\displaystyle \mathrm {2\ KCl+NiCl_{2}+3\ F_{2}\longrightarrow K_{2}[NiF_{6}]+2\ Cl_{2}} }$

properties

Potassium hexafluoronickelate (IV) is a diamagnetic, bright red salt that reacts with water, developing gas and forming a black precipitate. It is reduced by hydrogen at 200 ° C. and has a crystal structure of the potassium hexachloroplatinate (IV) type with a lattice parameter of a = 8.109 Å .

use

Potassium hexafluoronickelate (IV) is used as a starting material for the production of the strong oxidizing and fluorinating agents nickel (III) fluoride and nickel (IV) fluoride . It is also used as a fluorinating agent in organic chemistry.

Individual evidence

1. ↑ ^{a b c d} Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 277.
2. ↑ ^{a b c d e} data sheet Potassium hexafluoronickelate (IV), 99% from Sigma-Aldrich , accessed on October 24, 2013 ( PDF ).
3. ^ JH Simons: Fluorine Chemistry . Elsevier, 2012, ISBN 0-323-14543-4 , pp. 31 ( limited preview in Google Book search).
4. ^ JC Taylor, PW Wilson: The structures of fluorides IV. In: Journal of Inorganic and Nuclear Chemistry. 36, 1974, pp. 1561-1563, doi : 10.1016 / 0022-1902 (74) 80623-8 .
5. ↑ T. Nakajima, B. Žemva, A. Tressaud: Advanced inorganic fluorides: synthesis, characterization, and applications . Elsevier, 2000, ISBN 0-08-052548-2 , pp. 108 ( limited preview in Google Book search).