Vanadium (II) chloride
Crystal structure | ||||||||||||||||
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__ V 2+ __ Cl - | ||||||||||||||||
General | ||||||||||||||||
Surname | Vanadium (II) chloride | |||||||||||||||
other names |
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Ratio formula | VCl 2 | |||||||||||||||
Brief description |
pale green solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 121.85 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
3.23 g cm −3 |
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Melting point |
1350 ° C |
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boiling point |
from 910 ° C sublimation |
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solubility |
soluble in water |
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safety instructions | ||||||||||||||||
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Toxicological data | ||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Vanadium (II) chloride is an inorganic chemical compound from the group of chlorides . It is a pale green solid that sublimates above 910 ° C.
history
By reducing vanadium (II) chloride with hydrogen , Henry Enfield Roscoe was able to produce metallic vanadium for the first time in 1867 .
Extraction and presentation
Vanadium (II) chloride can be obtained by reducing vanadium (III) chloride by heating (~ 675 ° C) in the presence of oxygen-free hydrogen .
Also the disproportionation of vanadium (III) chloride in nitrogen
or the direct reaction of vanadium with chlorine is possible.
properties
Vanadium (II) chloride is in the form of light green leaves. It is less hygroscopic than vanadium (III) and vanadium (IV) chloride and dissolves in alcohol or ether to form blue or yellow-green solutions. When dissolved in water, the violet [V (H 2 O) 6 ] 2+ ion forms , which is already oxidized by atmospheric oxygen.
It is a powerful reducing agent with which the reduction of sulfoxides to sulfides , organic azides to amines and the reductive coupling of some alkyl halides is possible.
Vanadium (II) chloride has a trigonal crystal structure with the space group P 3 m 1 (space group no. 164) , corresponding to that of cadmium iodide in the same space group.
Individual evidence
- ↑ a b c d Web elements: Vanadium dichloride
- ↑ a b c Ralph C. Young and Maynard E. Smith: Vanadium (II) chloride . In: JC Bailar, Jr. (Ed.): Inorganic Syntheses . tape 4 . McGraw-Hill, Inc., 1953, pp. 126-127 (English).
- ↑ a b c Data sheet Vanadium (II) chloride from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).
- ↑ a b c d e Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1408.