In contrast to the chloride, iron(III) bromide is unstable
under these conditions. The hydrated bromide can be dehydrated in a stream of hydrogen
bromide at 400°C. Iron(II) bromide forms a layer lattice of the CdI2 type. It has a magnetic
moment,μeff= 5·71 B.M. at 295°K. It is deliquescent and very soluble in water; the pale
green hexahydrate crystallizes at room temperature, the tetrahydrate above 49°C and the
dihydrate above 83°C. A 9-hydrate forms below -29·3°C. The anhydrous salt is also
soluble in ether, ethanol and acetonitrile.
Yellow to dark brown lumps
Iron(II) bromide is used as a polymerization catalyst. It is used in water treatment, chemical analysis and in ultra high purity for certain crystal growth applications.
Iron(II) bromide can be prepared by the direct reaction of bromine or hydrogen
bromide with iron at red heat.
This product has been enhanced for catalytic efficiency.
