Vanadium(III) bromide
Vanadium(III) bromide, also known as vanadium tribromide, is the inorganic compound with the formula VBr3. It is a polymeric with octahedral vanadium(III) surrounded by six bromide ligands.
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| Names | |
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| IUPAC name
Vanadium(III) bromide | |
| Other names
Vanadium tribromide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.382  |
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| Properties | |
| VBr3 | |
| Molar mass | 290.654 g/mol |
| Appearance | Gray-brown solid |
| Density | 4 g/cm3 |
| soluble | |
| Solubility | soluble in THF (forms adduct) |
| +2890.0·10−6 cm3/mol | |
| Structure | |
| octahedral | |
| Related compounds | |
Other anions |
Vanadium(III) chloride |
Other cations |
Titanium(III) bromide Molybdenum(III) bromide |
Related compounds |
Vanadium(II) bromide |
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 | |
VBr3 has been prepared by treatment of vanadium tetrachloride with hydrogen bromide:
- 2 VCl4 + 8 HBr → 2 VBr3 + 8 HCl + Br2
The reaction proceeds via the unstable vanadium(IV) bromide (VBr4), which releases Br2 near 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 cation trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.[3]
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.
References
- Calderazzo, Fausto; Maichle-Mössmer, Cäcilie; Pampaloni, Guido; Strähle, Joachim (1993). "Low-Temperature Syntheses of Vanadium(III) and Molybdenum(IV) Bromides by Halide Exchange". J. Chem. Soc., Dalton Trans. (5): 655–658. doi:10.1039/DT9930000655.
- 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.
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