Vanadium(III) bromide
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| Vanadium(III) bromide | ||
|---|---|---|
| Image:Vanadium(III) bromide.jpg | ||
| General | ||
| Systematic name | Vanadium(III) bromide | |
| Other names | Vanadium tribromide | |
| Molecular formula | VBr3 | |
| SMILES | ? | |
| Molar mass | 290.654 g/mol | |
| Appearance | Gray-brown solid | |
| CAS number | [13470-26-3] | |
| Properties | ||
| Density and phase | 4 g/cm3, solid | |
| Solubility in water | soluble | |
| Other solvents | soluble in THF (forms adduct) |
|
| Melting point | ? °C (? K) | |
| Structure | ||
| Coordination geometry |
octahedral | |
| Crystal structure | ? | |
| Hazards | ||
| MSDS | External MSDS | |
| Main hazards | ? | |
| NFPA 704 | ||
| R/S statement | R: ? S: ? |
|
| RTECS number | ? | |
| Supplementary data page | ||
| Structure and properties |
n, εr, etc. | |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
|
| Spectral data | UV, IR, NMR, MS | |
| Related compounds | ||
| Other anions | Vanadium(III) chloride | |
| Other cations | Titanium(III) chloride | |
| Related compounds | MoBr3 VCl2 VCl4 |
? |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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:
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]
[edit] 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.
[edit] 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.
