Chromium(III) bromide is an

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

with the

chemical formula A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as pare ...

. It is a dark colored solid that appears green in transmitted light but red with reflected light. It is used as a precursor to catalysts for the oligomerization of ethylene. __TOC__

Synthesis

The compound is prepared in a tube furnace by the reaction of bromine vapor and chromium powder at 1000 °C. It is purified by extracting with absolute diethyl ether to remove any , and is subsequently washed with absolute diethyl ether and absolute ethanol. :: The effect of bromine on a highly heated mixture of chromium(III) oxide with coal: ::

Chemical properties

Analogous to the behavior of related chromium(III) halides, the tribromide dissolves in water to give only upon the addition of catalytic amounts of a reducing agent, which generates . The reducing agent generates chromous bromide on the surface of the solid, which dissolves and re-oxidizes to Cr(III). Chromium(III) bromide is reduced by

hydrogen Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter ...

gas at 350-400 °C to give chromium(II) bromide: :: Oxidizes when heated in air: ::

References

{{Bromides Chromium(III) compounds Bromides Metal halides