| Iron(III) bromide | |
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Iron(III) bromide |
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Other names
Ferric bromide |
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| Identifiers | |
| CAS number | 10031-26-2 |
| PubChem | 25554 |
| Properties | |
| Molecular formula | FeBr3 |
| Molar mass | 295.56 g mol−1 |
| Appearance | brown solid |
| Odor | odorless |
| Density | 4.50 g cm−3 |
| Melting point |
200 °C (decomposes) |
| Structure | |
| Crystal structure | Trigonal, hR24 |
| Space group | R-3, No. 148 |
| Hazards | |
| R-phrases | R36/37/38 |
| S-phrases | S26 S37/39 |
| Main hazards | corrosive |
| NFPA 704 |
0
3
0
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| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Iron(III) bromide is the chemical compound with the formula FeBr3. Also known as ferric bromide, this red-brown compound is used as a Lewis acid catalyst in the halogenation of aromatic compounds. It reacts with water to give acidic solutions.
FeBr3 forms a polymeric structure featuring six-coordinate, octahedral Fe centers.[1] Although inexpensively available commercially, FeBr3 can be prepared by treatment of iron metal with bromine:
Above 200 °C, FeBr3 decomposes to ferrous bromide:
Iron(III) chloride is considerably more stable, reflecting the greater oxidizing power of chlorine. FeI3 is not stable, as iron(III) will oxidize iodide ions.
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