Vanadium(III) bromide

Vanadium(III) bromide

Names
IUPAC name Vanadium(III) bromide
Other names Vanadium tribromide
Identifiers
CAS Number	13470-26-3
ChemSpider	11476059 Y
Jmol 3D model	Interactive image
PubChem	83509
RTECS number	YW2750000
InChI InChI=1S/3BrH.V/h3*1H;/q;;;+3/p-3 Y Key: ZOYIPGHJSALYPY-UHFFFAOYSA-K Y 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/cm3, solid
Solubility in water	soluble
Solubility	soluble in THF (forms adduct)
Structure
Coordination geometry	octahedral
Vapor pressure	{{{value}}}
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.

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

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

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.