Vanadium(III) bromide

Vanadium(III) bromide
Names
	IUPAC name Vanadium(III) bromide
	Other names Vanadium tribromide
Identifiers
CAS Number	13470-26-3 ;
3D model (JSmol)	Interactive image;
ChemSpider	11476059 ;
ECHA InfoCard	100.033.382
EC Number	236-736-6
PubChem CID	83509;
RTECS number	YW2750000
	InChI InChI=1S/3BrH.V/h31H;/q;;;+3/p-3 Key: ZOYIPGHJSALYPY-UHFFFAOYSA-K ; InChI=1/3BrH.V/h31H;/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)
Magnetic susceptibility (χ)	+2890.0·10−6 cm3/mol
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

↑ 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.
↑ 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.
↑ 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.

Vanadium(III) bromide

References

Further reading