Nomenclature
CAS number: 10031-25-1
Br
3Cr; mol wt 291.71.
Br 82.17%, Cr 17.82%.
CrBr
3.
Description and references
Prepd by passing Br2 vapor over
Cr powder at 1000°: Hein, Herzog, in Handbook
of Preparative Inorganic Chemistry vol. 2, G.
Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1341.
Properties
Black, lustrous, hexagonal crystals; green in
transmitted and reddish in reflected light. Sol in cold water only
upon addition of chromous salts; sol in boiling water.Derivative
Hexahydrate.
Properties
At least two isomeric forms exist. Dibromotetraaquochromium bromide dihydrate, [CrBr2(H2O)4]Br.2H2O; green, deliquesc crystals; sol in water, alc. Hexaaquochromium tribromide, [Cr(H2O)6]Br3; violet,
deliquesc crystals; sol in water. Insol in alc. Both forms practically
insol in ether.Use
In catalysts for polymerization of olefins.