Iron (III) bromide
Crystal structure | ||||||||||||||||
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__ Fe 3+ __ Br - | ||||||||||||||||
Crystal system | ||||||||||||||||
Space group |
R 3 (No. 148) |
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Lattice parameters |
a = 639.7 pm |
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Coordination numbers |
Fe [6], Br [2] |
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General | ||||||||||||||||
Surname | Iron (III) bromide | |||||||||||||||
other names |
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Ratio formula | FeBr 3 | |||||||||||||||
Brief description |
brown-red crystalline solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 295.56 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
4.5 g cm −3 |
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Melting point |
200 ° C (decomposition) |
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safety instructions | ||||||||||||||||
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Thermodynamic properties | ||||||||||||||||
ΔH f 0 |
−268 kJ mol −1 |
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Iron (III) bromide is a chemical compound of iron and is one of the bromides .
Extraction and presentation
Iron (III) bromide can be produced by reacting iron with bromine .
It can also be obtained from the processing of potash salts .
properties
Iron (III) bromide decomposes at temperatures> 200 ° C to iron (II) bromide and bromine. The reaction is reversible at a lower temperature.
Iron (III) bromide crystallizes in the trigonal crystal system with the space group R 3 (space group no. 148) . The lattice constants are a = 639.7 pm and c = 1837.5 pm.
use
Iron bromide is used as a catalyst ( Lewis acid ) in aromatic substitutions (e.g. electrophilic aromatic substitution , bromination of benzene ).
Individual evidence
- ↑ a b c iron tribromide at WebElements .
- ↑ a b Data sheet Iron (III) bromide from Sigma-Aldrich , accessed on March 29, 2011 ( PDF ).
- ^ AF Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 2: Subgroup elements, lanthanoids, actinides, transactinides. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049590-4 , p. 1949 (Reading sample: Part C - Subgroup elements. Google book search ).
- ↑ Georg Brauer (ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1643.
- ^ Potash salt storage in Uzbekistan ( Memento from January 19, 2012 in the Internet Archive ).
- ↑ M. Armbruster, Th. Ludwig, HW Rotter, G. Thiele, H. Oppermann: About iron tribromide: Investigations of equilibria, crystal structure and spectroscopic characterization. In: Z. anorg. allg. Chem. 626, 2000, pp. 187-195. doi : 10.1002 / (SICI) 1521-3749 (200001) 626: 1 <187 :: AID-ZAAC187> 3.0.CO; 2-X
- ↑ Hermann Bünte, Klaus Bünte: The spectrum of medicine: illustrated manual from the basics to the clinic . Schattauer Verlag, 2004, ISBN 3-7945-2374-1 , p. 154 ( limited preview in Google Book search).