Vanadium (II) bromide
Crystal structure | ||||||||||
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__ V 2+ __ Br - | ||||||||||
General | ||||||||||
Surname | Vanadium (II) bromide | |||||||||
other names |
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Ratio formula | VBr 2 | |||||||||
Brief description |
pale brown, crystalline solid |
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properties | ||||||||||
Molar mass | 210.75 g mol −1 | |||||||||
Physical state |
firmly |
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density |
3.23 g cm −3 |
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boiling point |
800 ° C |
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solubility |
dissolves in water with formation of [V (H 2 O) 6 ] 2+ ions |
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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 (II) bromide is a chemical compound of the elements vanadium and bromine . It is a pale orange-brown, crystalline solid that boils at 800 ° C.
Extraction and presentation
Vanadium (II) bromide can be obtained by reducing vanadium (III) bromide with hydrogen at 400 ° C:
It can also be obtained by bromination of vanadium .
properties
Physical Properties
Vanadium (II) bromide is a light brown solid that turns pink when hot. It is more hygroscopic than vanadium (II) chloride , but not as sensitive as vanadium (III) bromide . With water it forms a violet solution from which the blue-violet needles of the hexahydrate can be isolated. It has an octahedral crystal structure , similar to that of cadmium iodide , with the space group P 3 m 1 (space group no. 164) and the lattice parameters a = 3.768 Å , c = 6.180 Å.
Chemical properties
Vanadium (II) bromide is a powerful reducing agent that even reduces nitrogen to hydrazine in the presence of magnesium hydroxide .
It dissolves in water with the formation of [V (H 2 O) 6 ] 2+ ions:
Individual evidence
- ↑ a b c Vanadium (II) bromide on webelements.com
- ^ 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. 1550.
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ Lothar Kolditz: Inorganic Chemistry Part 2 . VEB Deutscher Verlag der Wissenschaften, Berlin 1980, p. 641.
- ↑ a b 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. 1413.