Vanadium(III) bromide

Vanadium(III) bromide

Names
IUPAC name Vanadium(III) bromide
Other names Vanadium tribromide
Identifiers
CAS Number	13470-26-3
ChemSpider	11476059
Jmol interactive 3D	Image
PubChem	83509
RTECS number	YW2750000
InChI InChI=1S/3BrH.V/h3*1H;/q;;;+3/p-3 Key: ZOYIPGHJSALYPY-UHFFFAOYSA-K InChI=1/3BrH.V/h3*1H;/q;;;+3/p-3 Key: ZOYIPGHJSALYPY-DFZHHIFOAP
SMILES [V+3].[Br-].[Br-].[Br-]
Properties
Chemical formula	VBr3
Molar mass	290.654 g/mol
Appearance	Gray-brown solid
Density	4 g/cm^3, 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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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

• 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.