Tungsten (IV) bromide

Crystal structure
__ W 4+      __ Br -
General
Surname	Tungsten (IV) bromide
other names	Tungsten tetrabromide
Ratio formula	WBr 4
Brief description	black solid
External identifiers / databases
CAS number 14055-81-3 Wikidata Q13722016
properties
Molar mass	503.456 g mol −1
Physical state	firmly
Melting point	240 ° C (sublimation)
solubility	reacts with water
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 .

Tungsten (IV) bromide is an inorganic chemical compound of the tungsten from the group of bromides .

Extraction and presentation

Tungsten (IV) bromide can be obtained by reacting tungsten (V) bromide with tungsten at above 350 ° C or with aluminum above 240 ° C.

${\displaystyle \mathrm {4\ WBr_{5}+W\longrightarrow 5\ WBr_{4}} }$

${\displaystyle \mathrm {3\ WBr_{5}+Al\longrightarrow 3\ WBr_{4}+AlBr_{3}} }$

properties

Tungsten (IV) bromide is in the form of diamagnetic black crystal needles. Its crystal structure is isotypic to that of niobium (IV) chloride (a = 849 pm, b = 929 pm, c = 725 pm).

Individual evidence

1. ↑ ^{a b c d} 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. 1561.
2. ↑ ^{a b} W. M. Haynes, David R. Lide, Thomas J. Bruno: CRC Handbook of Chemistry and Physics 2012-2013 . CRC Press, 2012, ISBN 1-4398-8049-2 , pp. 4–97 ( limited preview in Google Book Search).
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.