Vanadium (III) fluoride
Crystal structure | ||||||||||||||||
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__ V 3+ __ F - | ||||||||||||||||
General | ||||||||||||||||
Surname | Vanadium (III) fluoride | |||||||||||||||
other names |
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Ratio formula | VF 3 | |||||||||||||||
Brief description |
yellow-green powder |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 107.94 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
3.36 g cm −3 |
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Melting point |
1400 ° C |
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boiling point |
800 ° C |
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solubility |
almost insoluble in water |
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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 (III) fluoride is a chemical compound from the group of fluorides . It is in the form of a gray to green powder.
Extraction and presentation
Vanadium (III) fluoride can be obtained from vanadium (III) oxide . Either the direct synthesis by reaction with hydrogen fluoride or the reaction with ammonium hydrogen difluoride and subsequent thermal decomposition of the hexaammonium salt is used for this purpose.
A synthesis from vanadium (III) chloride and hydrogen fluoride is also possible.
properties
The crystal structure ( trigonal , space group R 3 c (space group no.167 ) , a = 516.8 pm, c = 1343.8 pm) of vanadium (III) fluoride consists of mutually tilted and corner-linked in all directions of space Octahedra . Vanadium (III) fluoride turns black on contact with sodium hydroxide solution .
use
By reaction with oxygen may Vanadium (V) Oxytrifluoride be obtained.
Web links
- Freepatents online: Method for the preparation of high surface area metal fluorides
Individual evidence
- ↑ a b c d Web elements: Vanadium trifluoride .
- ↑ Data sheet vanadium (III) fluoride from AlfaAesar, accessed on April 1, 2010 ( PDF )(JavaScript required) .
- ↑ a b Data sheet vanadium (III) fluoride from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).
- ^ BJ Sturm, CW Sheridan: "Vanadium (III) Fluoride", Inorganic Syntheses 1963; Vol. 7, pp. 52-54, ISBN 0-88275-165-4 .
- ↑ P. Daniel, A. Bulou, M. Leblanc, M. Rousseau, J. Nouet: Structural and vibrational study of VF 3 . In: Materials Research Bulletin , 1992 , 38 , pp. 127-220 doi: 10.1016 / 0025-5408 (90) 90175-2
- ↑ University of Freiburg: Vanadium trifluoride structure .
- ↑ Gurdeep Raj: Advanced Inorganic Chemistry Vol-1 . 1975, ISBN 81-87224-03-7 , pp. 1204 ( limited preview in Google Book search).