Chromium(III) bromide

Chromium(III) bromide is an inorganic compound with the chemical formula CrBr3. 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.

Chromium(III) bromide
Names
IUPAC name
Chromium(III) bromide
Other names
  • Chromic bromide
  • Chromium bromide
  • Chromium tribromide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.068
EC Number
  • 233-088-6
PubChem CID
UNII
  • InChI=1S/3BrH.Cr/h3*1H;/q;;;+3/p-3
    Key: UZDWIWGMKWZEPE-UHFFFAOYSA-K
SMILES
  • [Cr+3].[Br-].[Br-].[Br-]
Properties
CrBr3
Molar mass 291.708 g·mol−1
Appearance Black lustrous crystals; green in transmitted light, reddish in reflected light
Density 4.25 g/cm3
Melting point 1,130 °C (2,070 °F; 1,400 K) (anhydrous)
79 °C (hexahydrate)
anhydrous: insoluble in cold water, soluble with addition of Chromium(II) ion salts, soluble in hot water; hexahydrate: highly soluble
Structure
trigonal
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1 mg/m3
REL (Recommended)
 TWA 0.5 mg/m3
IDLH (Immediate danger)
 250 mg/m3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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