Vanadium (IV) bromide

General
Surname	Vanadium (IV) bromide
other names	Vanadium tetrabromide Vanadium (IV) bromide Vanadium tetrabromide
Molecular formula	VBr 4
Brief description	purple, crystalline solid (below −23 ° C)
External identifiers / databases
CAS number 13595-30-7 PubChem 10270529 Wikidata Q2509958
properties
Molar mass	370.558 g mol −1
Physical state	solid (below −23 ° C)
Melting point	Decomposes from −23 ° C to VBr 3 and Br 2
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Vanadium (IV) bromide is a chemical compound of the elements vanadium and bromine . It is a purple-red, crystalline solid that is only stable in the gas phase and below −23 ° C.

Extraction and presentation

Vanadium (IV) bromide can be obtained from the elements at over 300 ° C:

${\displaystyle \mathrm {V+2\ Br_{2}\longrightarrow VBr_{4}} }$

The gas is then brought to a cold surface of −78 ° C, since vanadium (IV) bromide is very decomposable at room temperature.

properties

At above −23 ° C vanadium (IV) bromide breaks down into vanadium (III) bromide and bromine :

${\displaystyle \mathrm {2\ VBr_{4}\longrightarrow 2\ VBr_{3}+Br_{2}} }$

Individual evidence

1. ↑ webelements.com: Vanadium: vanadium tetrabromide , accessed on January 14, 2018.
2. ↑ ^{a b c d e} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , pp. 1545-1548.
3. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.