Vanadium (III) bromide

Crystal structure
	__ V 3+ __ Br -
General
Surname	Vanadium (III) bromide
other names	Vanadium tribromide
Ratio formula	VBr 3
Brief description	black solid
External identifiers / databases
EC number	236-736-6
ECHA InfoCard	100,033,382
PubChem	83509
ChemSpider	11476059
Wikidata	Q421515
properties
Molar mass	290.65 g mol −1
Physical state	firmly
density	4.0 g cm −3 (20 ° C)
solubility	soluble in water
safety instructions
GHS labeling of hazardous substances danger
H and P phrases	H: 314
	P: 280-305 + 351 + 338-310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

(III) bromide Vanadium is an unstable chemical compound of the vanadium from the group of bromides .

Extraction and presentation

Vanadium (III) bromide can be obtained by reacting vanadium (IV) chloride with hydrogen bromide , the unstable vanadium (IV) bromide being formed as an intermediate product .

{\ displaystyle \ mathrm {2 \ VCl_ {4} +8 \ HBr \ longrightarrow 2 \ VBr_ {3} +8 \ HCl + Br_ {2}}}

It is also possible to display it by reacting bromine with vanadium or ferrovanadine .

{\ displaystyle \ mathrm {2 \ V + 3 \ Br_ {2} \ longrightarrow 2 \ VBr_ {3}}}

{\ displaystyle \ mathrm {2 \ VFe + 6 \ Br_ {2} \ longrightarrow 2 \ VBr_ {3} + FeBr_ {3}}}

properties

Vanadium (III) bromide is in the form of black, leafy, very hygroscopic crystals with an occasional greenish sheen. Is soluble in water with green color. Its crystal structure is isotypic to that of vanadium (III) chloride with the space group R 3 c (space group no. 167) , a = 6.400 Å , c = 18.53 Å. When heated to temperatures around 500 ° C, a violet gas phase is formed, from which, under suitable conditions, red vanadium (IV) bromide , which already decomposes at −23 ° C , can be deposited by rapid cooling . Template: room group / 167

Vanadium (III) bromide decomposes on contact with air, light or moisture to vanadium , vanadium oxides and hydrogen bromide . Like vanadium (III) chloride, vanadium (III) bromide with dimethoxyethane and THF gives red-brown, soluble complex compounds.

Individual evidence

↑ ^a ^b ^c data sheet vanadium (III) bromide from AlfaAesar, accessed on April 1, 2010 ( PDF )(JavaScript required) .
↑ ^a ^b Data sheet vanadium (III) bromide from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).
↑ ^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.
Jump up ↑ GWA Fowles, PT Greene, TE Lester: Ether Complexes of Tervalent Titanium and Vanadium . In: J. Inorg. Nucl. Chem. 1967, 29, pp. 2365-2370.

[alfa-1] ta sheet vanadium (III) bromide from AlfaAesar, accessed on April 1, 2010 ( PDF )(JavaScript required) .

[Sigma-2] Data sheet vanadium (III) bromide from Sigma-Aldrich , accessed on April 25, 2011 ( PDF ).

[brauer-3] 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.

[4] Jump up ↑ GWA Fowles, PT Greene, TE Lester: Ether Complexes of Tervalent Titanium and Vanadium . In: J. Inorg. Nucl. Chem. 1967, 29, pp. 2365-2370.