Vanadium(III) bromide

Vanadium(III) bromide

Chembox new
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.


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