Chromium(III) bromide

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Chromium(III) bromide
Kristallstruktur Bismut(III)-iodid.png
CAS number 10031-25-1, 13478-06-3 (hexahydrate)
PubChem 82309
ChemSpider 74280
EC number 233-088-6
Jmol-3D images Image 1
Molecular formula Br3Cr
Molar mass 291.71 g mol−1
Appearance Black lustrous crystals; green in transmitted light, reddish in reflected light[1]
Density 4.25 g/cm3[2]
Melting point 1,130 °C (2,070 °F; 1,400 K) (anhydrous)[2]
79 °C (hexahydrate)
Solubility in water insoluble in cold water, soluble with addition of Chromium(II) ion salts,[1] soluble in hot water[2]
Crystal structure trigonal
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Chromium(III) bromide is an inorganic compound with the chemical formula CrBr3. It is used in catalysts for the polymerization of olefins.


Desiccated bromine vapor is passed over chromium powder at 1000 °C for approximately 45–60 minutes, and is purified by extracting with absolute diethyl ether to remove any CrBr2, and is subsequently washed with absolute diethyl ether and absolute ethanol.[1]


  1. ^ a b c Brauer, Georg (1965) [1962]. Handbuch Der Präparativen Anorganischen Chemie [Handbook of Preparative Inorganic Chemistry] (in German) 2. Stuttgart; New York, New York: Ferdinand Enke Verlag; Academic Press, Inc. p. 1340. ISBN 978-0-32316129-9. Retrieved 2014-01-10. 
  2. ^ a b c Perry, Dale L. (2011). Handbook of Inorganic Compounds, Second Edition. Boca Raton, Florida: CRC Press. p. 122. ISBN 978-1-43981462-8. Retrieved 2014-01-10.