Tungsten (III) bromide

Crystal structure
__ W 3+      __ Br -
General
Surname	Tungsten (III) bromide
other names	Tungsten tribromide
Ratio formula	WBr 3
Brief description	black solid
External identifiers / databases
CAS number 15163-24-3 Wikidata Q13721478
properties
Molar mass	423.55 g mol −1
Physical state	firmly
solubility	almost insoluble in 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 (III) bromide is an inorganic chemical compound of tungsten from the group of bromides .

Extraction and presentation

Tungsten (III) bromide can be obtained by reacting tungsten (II) bromide or its dihydrate with bromine at 50 ° C.

${\displaystyle \mathrm {[W_{6}Br_{8}]Br_{4}\cdot 2H_{2}O+3\ Br_{2}\longrightarrow [W_{6}Br_{12}]Br_{6}+2\ H_{2}O} }$

properties

Tungsten (III) bromide is a black, thermally unstable solid. From 180 ° C the decomposition into tungsten (II) bromide and bromine takes place in a vacuum. It is resistant to air and hydrogen and has limited solubility in carbon tetrachloride , acetonitrile and benzene . Its crystal structure is isotypic to that of tungsten (III) chloride ( trigonal , a = 1572 pm, c = 882 pm).

Individual evidence

1. ↑ ^{a b c d e} Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis US, 2011, ISBN 1-4398-1462-7 , pp. 495 ( limited preview in Google Book search).
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ ^{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. 1560.