Vanadium(III) bromide

Vanadium(III) bromide
IUPAC name

Vanadium(III) bromide
Other names

Vanadium tribromide
Identifiers
CAS number 13470-26-3
PubChem 83509
ChemSpider 11476059 Y
RTECS number YW2750000
Jmol-3D images Image 1
Properties
Molecular formula VBr3
Molar mass 290.654 g/mol
Appearance Gray-brown solid
Density 4 g/cm3, solid
Solubility in water soluble
Solubility soluble in THF
(forms adduct)
Structure
Coordination
geometry		 octahedral
Related compounds
Other anions Vanadium(III) chloride
Other cations Titanium(III) chloride
Related compounds MoBr3
VCl2
VCl4
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Vanadium(III) bromide, also known as vanadium tribromide, is VBr3. In the solid-state, this species is a polymeric with octahedral vanadium(III) surrounded by six bromide ligands.

VBr3 has been prepared by treatment of VCl4 with HBr:

2 VCl4 + 8 HBr → 2 VBr3 + 8 HCl + Br2

The reaction proceeds via the unstable vanadium(IV) bromide, VBr4, which releases Br2 at room temperature.[1]

Like VCl3, VBr3 forms red-brown soluble complexes with dimethoxyethane and THF, such as mer-VBr3(THF)3.[2]

Aqueous solutions prepared from VBr3 contain the salt trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.[3]

References

  1. ^ Calderazzo, F.; Maichle-Mossmer, C.; Pampaloni, G. and Strähle, J., "Low-temperature Syntheses of Vanadium(III) and Molybdenum(IV) Bromides by Halide Exchange", Journal of the Chemical Society, Dalton Transactions, 1993, pages 655-8.
  2. ^ G. W. A. Fowles, G. W. A.; Greene, P. T.; Lester, T. E. "Ether Complexes of Tervalent Titanium and Vanadium" J. inorg, nucl. Chem., 1967. Vol. 29. pp. 2365 to 2370.
  3. ^ Donovan, W. F.; Smith, P. W. "Crystal and Molecular Structures of Aquahalogenovanadium(1ii) Complexes. Part 1. X-Ray Crystal Structure of trans-Tetrakisaquadibromovanadium(III) Bromide Dihydrate and the lsomorphous Chloro-compound" Journal of the Chemical Society, Daltor Transactions." 1975, pages 894-896.

Further reading