Vanadium (IV) fluoride

Crystal structure
	__ V 4+ __ F -
Crystal system	monoclinic
Space group	P 2 1 / n (No. 14, position 2)
Lattice parameters	a = 534.0 pm ; b = 517.0 pm ; c = 538.1 pm ; β = 119.89 °
General
Surname	Vanadium (IV) fluoride
other names	Vanadium tetrafluoride; Vanadium (IV) fluoride; Vanadium tetrafluoride;
Ratio formula	VF 4
Brief description	light green solid
External identifiers / databases
EC number	233-171-7
ECHA InfoCard	100.030.143
PubChem	5153193
Wikidata	Q416028
properties
Molar mass	126.935 g mol −1
Physical state	firmly
density	3.15 g cm −3
Melting point	Decomposes at 325 ° C
boiling point	sublimated
solubility	almost insoluble in non-polar solvents
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 301-331-314-318
	P: 260-261-280-301 + 310-303 + 361 + 353-305 + 351 + 338-301 + 330 + 331-304 + 340-405-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Vanadium (IV) fluoride is a chemical compound of the elements vanadium and fluorine . It is a light green, hygroscopic solid that decomposes at 325 ° C.

history

Vanadium tetrafluoride was first described by Otto Ruff and Herbert Lickfett in 1911 .

Extraction and presentation

Vanadium (IV) fluoride can be obtained by allowing hydrofluoric acid to act on vanadium tetrachloride at low temperatures .

{\ displaystyle \ mathrm {VCl_ {4} +4 \ HF \ longrightarrow VF_ {4} +4 \ HCl}}

Vanadium (IV) chloride and hydrofluoric acid react to form vanadium (IV) fluoride.

properties

Physical Properties

Vanadium (IV) fluoride crystallizes in a layer structure ( monoclinic symmetry, space group P 2 ₁ / n (space group no. 14, position 2) ) in which the vanadium ions are octahedral surrounded by fluoride ions. Each VF ₆ octahedron is linked to other octahedra via four corners. Template: room group / 14.2

Chemical properties

When heated, vanadium (IV) fluoride disproportionates into vanadium (III) fluoride and vanadium (V) fluoride :

{\ displaystyle \ mathrm {2 \ VF_ {4} \ longrightarrow VF_ {3} + VF_ {5}}}

The reaction with acids produces highly toxic hydrogen fluoride , here hydrochloric acid as an example :

{\ displaystyle \ mathrm {VF_ {4} +4 \ HCl \ longrightarrow VCl_ {4} +4 \ HF}}

Individual evidence

↑ ^a ^b S. Becker, B. G. Müller: Vanadium tetrafluoride . In: Angewandte Chemie , 1990 , 102 , pp. 427-428 ( doi : 10.1002 / anie.19901020422 ).
^ ^A ^b ^c ^d A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1547.
↑ ^a ^b ^c ^d vanadium (IV) fluoride on webelements.com.
↑ ^a ^b Data sheet Vanadium (IV) fluoride, 95% from AlfaAesar, accessed on October 31, 2016 ( PDF )(JavaScript required) .
↑ Otto Ruff, Herbert Lickfett: Contribution to the knowledge of the vanadium chlorides. In: Reports of the German Chemical Society. 1911, 44, pp. 506-521, doi : 10.1002 / cber.19110440179 .
↑ ^a ^b Otto Ruff, Herbert Lickfett: Vanadinfluoride. In: Reports of the German Chemical Society. 1911, 44, pp. 2539-2549, doi : 10.1002 / cber.19110440379 .

[Mueller-1] S. Becker, B. G. Müller: Vanadium tetrafluoride . In: Angewandte Chemie , 1990 , 102 , pp. 427-428 ( doi : 10.1002 / anie.19901020422 ).

[HoWi-2] A ^b ^c ^d A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1547.

[webelements-3] vanadium (IV) fluoride on webelements.com.

[Alfa-4] Data sheet Vanadium (IV) fluoride, 95% from AlfaAesar, accessed on October 31, 2016 ( PDF )(JavaScript required) .

[Ruff&Lickfett-5] Otto Ruff, Herbert Lickfett: Contribution to the knowledge of the vanadium chlorides. In: Reports of the German Chemical Society. 1911, 44, pp. 506-521, doi : 10.1002 / cber.19110440179 .

[Ruff&Lickfett2-6] Otto Ruff, Herbert Lickfett: Vanadinfluoride. In: Reports of the German Chemical Society. 1911, 44, pp. 2539-2549, doi : 10.1002 / cber.19110440379 .