Iron(II) bromide
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| Iron(II) bromide | |
|---|---|
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| General | |
| Systematic name | Iron(II) bromide |
| Other names | Ferrous bromide |
| Molecular formula | FeBr2 |
| Molar mass | 215.65 g/mol |
| Appearance | yellow-brown solid |
| CAS number | [7789-46-0] |
| Properties | |
| Density and phase | 4.63 g/cm3, solid |
| Solubility in water | soluble |
| Other solvents | THF, methanol, ethanol |
| Melting point | 684 °C |
| Boiling point | 934 °C |
| Enthalpy of formation | -250 kJ/mol |
| Structure | |
| Coordination geometry | octahedral in solid state |
| Crystal structure | CdI2 |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | none |
| NFPA 704 | |
| Flash point | ? °C |
| R/S statement | R: 20-36/37/38 S: 26-36 |
| RTECS number | ? |
| Supplementary data page | |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | Iron(II) chloride |
| Other cations | iron(III) bromide |
| Related compounds | VBr2 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) [Chemical infoboxInfobox disclaimer and references] | |
Iron(II) bromide is the chemical compound FeBr2. This brownish-colored solid is a useful synthetic intermediate; for example it is employed to insert Fe(II) into porphyrins.
Structure
Like most metal halides, FeBr2 adopts a polymeric structure consisting of isolated metal centers cross-linked with halides. It crystallizes with the CdI2 structure, featuring close-packed layers of bromide ions, between which are located Fe(II) ions in octahedral holes.Haberecht, J.; Borrmann, H.; Kniep, R. "Refinement of the Crystal Structure of Iron Dibromide, FeBr2"Zeitschrift fuer Kristallographie - New Crystal Structures (2001), volume 216, page510. The packing of the halides is slightly different from that for FeCl2, which adopts the CdCl2 motif. FeBr2 also forms hydrates.Synthesis
FeBr2 is conveniently synthesized using a methanol solution of concentrated hydrobromic acid. Addition with Fe gives the methanol solvate [Fe(MeOH)6]Br2 together with hydrogen gas. Heating the methanol complex in a vacuum at ca. 160 °C gives pure FeBr2.G. Winter, "Iron(II) Halides" in "Inorganic Syntheses" 1973, volume 14, pages 101-104.Reactions
FeBr2 reacts with (C2H5)4NBr to give [(C2H5)4N]2FeBr4.N. S. Gill, F.. B. Taylor Inorganic Syntheses 1967, volume 9, page 136-142.FeBr2 reacts with bromide and bromine to form the intensely colored, mixed-valence species [FeBr3Br9]-.Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5
References
External links
- For a full list of external links to MSDSs, spectroscopic data, commercial chemicals suppliers etc. for this compound, see [Chemical sources].
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