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Chromium(III) bromide

79 °C (hexahydrate) insoluble in cold watersoluble with addition of chromium(II) saltssoluble in hot waterhexahydrate highly soluble Chromium(III) bromide is an inorganic compound with the chemical formula . 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 charcoal: ::

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. 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 gas at 350-400 °C to give chromium(II) bromide: ::

Oxidizes when heated in air: ::

References

References

  1. F. Hein and S. Herzog. (1963). "Handbook of Preparative Inorganic Chemistry, 2nd Ed.". Academic Press.
  2. Perry, Dale L.. (2011). "Handbook of Inorganic Compounds, Second Edition". CRC Press.
  3. {{PGCH. 0141
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chromium(iii)-compounds bromides metal-halides
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