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Chemical compound From Wikipedia, the free encyclopedia
Vanadium(III) bromide, also known as vanadium tribromide, describes the inorganic compounds with the formula VBr3 and its hydrates. The anhydrous material is a green-black solid. In terms of its structure, the compound is polymeric with octahedral vanadium(III) surrounded by six bromide ligands.
Names | |
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IUPAC name
Vanadium(III) bromide | |
Other names
Vanadium tribromide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.033.382 |
EC Number |
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PubChem CID |
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RTECS number |
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CompTox Dashboard (EPA) |
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Properties | |
VBr3 | |
Molar mass | 290.654 g/mol |
Appearance | Green-black solid |
Density | 4 g/cm3 |
soluble | |
Solubility | soluble in THF (forms adduct) |
+2890.0·10−6 cm3/mol | |
Structure | |
octahedral | |
Related compounds | |
Other anions |
Vanadium(III) chloride |
Other cations |
Titanium(III) bromide Molybdenum(III) bromide |
Related compounds |
Vanadium(II) bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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VBr3 has been prepared by treatment of vanadium tetrachloride with hydrogen bromide:
The reaction proceeds via the unstable vanadium(IV) bromide (VBr4), which releases Br2 near room temperature.[1]
It is also possible to prepare vanadium(III) bromide by reacting bromine with vanadium or ferrovanadine:[2]
Vanadium(III) bromide is present in the form of black, leafy, very hygroscopic crystals with a sometimes greenish sheen. It is soluble in water with green color. Its crystal structure is isotypic to that of vanadium(III) chloride with space group R3c (space group no. 167), a = 6.400 Å, c = 18.53 Å. When heated to temperatures of around 500 °C, a violet gas phase is formed, from which, under suitable conditions, red vanadium(IV) bromide can be separated by rapid cooling, which decomposes at −23 °C.[2]
Like vanadium(III) chloride, vanadium(III) bromide forms red-brown soluble complexes with dimethoxyethane and THF, such as mer-VBr3(THF)3.[3]
Aqueous solutions prepared from VBr3 contain the cation trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.(H2O)2.[4]
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