Iron(II) bromide
- Eisendibromid
- Iron bromide ( ambiguous )
- Ferrum bromatum ( ambiguous )
Yellow to brown crystalline solid
Fixed
4.64 g · cm -3
688 ° C ( onset of decomposition)
971 ° C
Soluble in water
Attention
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Iron (II) bromide, is a chemical compound of iron and one of the bromides.
Production and representation
Iron (II ) bromide may be > 200 ° C are obtained by decomposition of the iron ( III ) bromide at temperatures ( therefore also occurs in the synthesis of FeBr3 of the elements as an intermediate and by-product on ).
Further iron ( II) bromide may be prepared from iron and ammonium bromide ( Lowig 1829).
The preparation by reaction of iron with hydrogen bromide is possible. When using hydrobromic acid formed during drying of the resulting solution in vacuo below 49 ° C the hexahydrate. Above this temperature produced the tetra-, from 83 ° C the dihydrate.
Properties
Iron (II ) bromide is a light yellow to dark brown crystallizer hygroscopic solid. He owns a Cadmium - type crystal system with space group P3m1 with lattice constants a = 377.6 pm and c = 622.7 pm. The hexahydrate is in the form of pale green, rhombic, not deliquescent tablets.