Iron(III) bromide

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Iron(III) bromide
IUPAC name
Iron(III) bromide
Other names
Ferric bromide
Iron tribromide
3D model (JSmol)
ECHA InfoCard 100.030.069
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)
Trigonal, hR24
R-3, No. 148
Main hazards corrosive
R-phrases (outdated) R36/37/38
S-phrases (outdated) S26 S37/39
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored 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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Infobox references

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 with water to give acidic solutions.

Structure, synthesis and basic properties[edit]

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:

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.


Ferric bromide is occasional use 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.[2]

See also[edit]


  1. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  2. ^ Drapeau, Martin Pichette; Lafantaisie, Mathieu; Ollevier, Thierry (2013). "Iron(III) bromide". e-EROS Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn01568.