7789-46-0

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 can be prepared by the direct reaction of bromine or hydrogen bromide with iron at red heat.