Vanadium(III) bromide

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Name = Vanadium(III) bromide
ImageFile = Vanadium(III) bromide.jpg
ImageName = Vanadium(III) bromide
IUPACName = Vanadium(III) bromide
OtherNames = Vanadium tribromide
Section1 = Chembox Identifiers
SMILES =
CASNo = 13470-26-3
RTECS =
Section2 = Chembox Properties
Formula = VBr₃
MolarMass = 290.654 g/mol
Appearance = Gray-brown solid
Density = 4 g/cm³, solid
Solubility = soluble
Solvent = other solvents
SolubleOther = soluble in THF
(forms adduct)
MeltingPt =
Section3 = Chembox Structure
Coordination = octahedral
CrystalStruct =
Section7 = Chembox Hazards
ExternalMSDS =
MainHazards =
RPhrases =
SPhrases =
Section8 = Chembox Related
OtherAnions = Vanadium(III) chloride
OtherCations = Titanium(III) chloride
Function = compounds
OtherFunctn = MoBr₃
VCl₂
VCl₄
?

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.

VBr₃has been prepared by treatment of VCl₄ with HBr:::2 VCl₄ + 8 HBr → 2 VBr₃ + 8 HCl + Br₂The reaction proceeds via the unstable vanadium(IV) bromide, VBr₄, which releases Br₂ at room temperature. [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.]

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

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

References

Further reading

*Stebler, A.; Leuenberger, B.; Guedel, H. U. "Synthesis and crystal growth of A₃M₂X₉ (A = Cs, Rb; M = Ti, V, Cr; X = Cl, Br)" Inorganic Syntheses (1989), volume 26, pages 377-85.