Iron(III) bromide
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| Names | |
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| IUPAC name
Iron(III) bromide
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| Other names
Ferric bromide
Iron tribromide tribromoiron | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.030.069 |
| EC Number |
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PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| FeBr3 | |
| Molar mass | 295.56 g mol−1 |
| Appearance | brown solid |
| Odor | odorless |
| Density | 4.50 g cm−3 |
| Melting point | 200 °C (392 °F; 473 K) (decomposes) |
| Structure | |
| Trigonal, hR24 | |
| R-3, No. 148 | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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corrosive |
| GHS labelling:[1] | |
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| Warning | |
| H315, H319, H335 | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Iron(III) bromide is the chemical compound with the formula FeBr3. Also known as ferric bromide, this red-brown odorless compound is used as a Lewis acid catalyst in the halogenation of aromatic compounds. It dissolves in water to give acidic solutions.
Structure, synthesis and basic properties
[edit]FeBr3 forms a polymeric structure featuring six-coordinate, octahedral Fe centers.[2] Although inexpensively available commercially, FeBr3 can be prepared by treatment of iron metal with bromine:
- 2 Fe + 3 Br2 → 2 FeBr3
Above 200 °C, FeBr3 decomposes to ferrous bromide:
- 2FeBr3 → 2FeBr2 + Br2
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.
Uses
[edit]Ferric bromide is occasionally used as an oxidant in organic chemistry, e.g. for the conversion of alcohols to ketones. It is used as a Lewis acidic catalyst for bromination of aromatic compounds. For the latter applications, it is often generated in situ.[3]
See also
[edit]- Iron(II) bromide, the lower bromide of iron
References
[edit]- ^ "C&L Inventory". echa.europa.eu.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ Drapeau, Martin Pichette; Lafantaisie, Mathieu; Ollevier, Thierry (2013). "Iron(III) bromide". E-EROS Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01568. ISBN 978-0471936237.