Iron(III) bromide
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Names | |
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IUPAC name Iron(III) bromide | |
Other names Ferric bromide Iron tribromide tribromoiron | |
Identifiers | |
3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.030.069 |
EC Number |
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PubChem CID | |
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 | 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). |
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.