IRON (II) FLUORIDE Property

Melting point:

>1000°C

Density 

4,09 g/cm³

solubility 

slightly soluble in H2O; soluble in dilute HF; insoluble in EtOH, ethyl ether

form 

Powder

color 

White

Specific Gravity

4.09

Water Solubility 

Insoluble in water.

Sensitive 

Air Sensitive & Hygroscopic

Crystal Structure

Rutile type

crystal system

square

Merck 

14,4045

Space group

P42/mnm

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.47	0.47	0.331	90	90	90	0.0731

Stability:

hygroscopic

CAS DataBase Reference

7789-28-8(CAS DataBase Reference)

EPA Substance Registry System

Iron fluoride (FeF2) (7789-28-8)

Safety

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

F 

3

Hazard Note 

Corrosive

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

HS Code 

2826199090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

IRON (II) FLUORIDE Chemical Properties,Usage,Production

Preparation

Anhydrous iron(II) fluoride may be prepared by passing hydrogen fluoride gas over iron at a high temperature:
2HF + Fe → FeF2 + H2
Alternative methods of preparation of anhydrous salt involve the reduction of iron(III) fluoride with hydrogen; or by passing fluorine gas over anhydrous iron(II) chloride in the cold:
2FeF3 + H2 → 2FeF2 + 2HF
FeCl2 + F2 → FeF2 + Cl2
The tetrahydrate may be prepared by dissolving iron metal in aqueous hydrofluoric acid.

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.
.

Uses

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

Uses

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.

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.