IRON (II) FLUORIDE

Chemical properties

brown fine crystalline powder

Chemical properties

Iron(II) fluoride is prepared by passing hydrogen fluoride over iron at red heat or over iron(II) chloride at a somewhat lower temperature. It is sparingly soluble in water with some hydrolysis, and is insoluble in alcohol, ether and benzene. The boiling point is about 1100°C and the melting point only a little below this temperature.

Physical properties

White tetragonal crystal; density 4.09g/cm³; melts at 1100°C; slightly soluble in water; insoluble in ethanol and ether; dissolves in dilute hydrofluoric acid. Tetrahydrate crystals are hexagonal shape; density 2.20g/cm³; decomposes at 100°C.
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The Uses of IRON (II) FLUORIDE

Iron(II) fluoride is used as a catalyst in organic fluorination reactions. Other applications are in ceramics; and in the preparation of fluoride salts of other metals.

The Uses of IRON (II) FLUORIDE

Iron(II) fluoride is used for proteomics research applications. It is also a chemical intermediate.

Structure and conformation

Iron(II) fluoride crystallizes in the rutile structure, the iron atom being surrounded tetragonally91 by 4F- at 2·12 ? and 2F- at 1·99 ?. Iron(II) fluoride is reduced to iron by hydrogen at red heat, but is stable to hydrogen at 400°—and can be prepared by reduction of iron(III) fluoride with hydrogen at this temperature. It reacts violently when heated with metals such as sodium and aluminium, but undergoes no visible reaction with bromine, iodine or sulphur. The ammoniates FeF2.5NH3,H20, FeF2.NH3.H20 and FeF2.0·5NH3.H2O are obtained in the reactions of gaseous ammonia with the tetrahydrate at various temperatures.