Vanadium (IV) fluoride
Crystal structure | ||||||||||||||||
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__ V 4+ __ F - | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
P 2 1 / n (No. 14, position 2) |
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Lattice parameters |
a = 534.0 pm |
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General | ||||||||||||||||
Surname | Vanadium (IV) fluoride | |||||||||||||||
other names |
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Ratio formula | VF 4 | |||||||||||||||
Brief description |
light green solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 126.935 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
3.15 g cm −3 |
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Melting point |
Decomposes at 325 ° C |
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boiling point |
sublimated |
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solubility |
almost insoluble in non-polar solvents |
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safety instructions | ||||||||||||||||
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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 .
- 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.
Chemical properties
When heated, vanadium (IV) fluoride disproportionates into vanadium (III) fluoride and vanadium (V) fluoride :
The reaction with acids produces highly toxic hydrogen fluoride , here hydrochloric acid as an example :
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 .