Iron(II) fluoride

Iron(II) fluoride
Identifiers
CAS Number	7789-28-8 anhydrous ; 13940-89-1 (tetrahydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	74215 ;
ECHA InfoCard	100.029.232
PubChem CID	522690;
UNII	NP4W87HLVO ;
CompTox Dashboard (EPA)	DTXSID50894779 ;
	InChI InChI=1S/2FH.Fe/h21H;/q;;+2/p-2 Key: FZGIHSNZYGFUGM-UHFFFAOYSA-L ; InChI=1/2FH.Fe/h21H;/q;;+2/p-2 Key: FZGIHSNZYGFUGM-NUQVWONBAX;
	SMILES [Fe+2].[F-].[F-];
Properties
Chemical formula	FeF2
Molar mass	93.84 g/mol (anhydrous) ; 165.902 g/mol (tetrahydrate)
Appearance	colorless transparent crystals
Density	4.09 g/cm3 (anhydrous) ; 2.20 g/cm3 (tetrahydrate)
Melting point	970 °C (1,780 °F; 1,240 K) (anhydrous) ; 100 °C (tetrahydrate)
Boiling point	1,100 °C (2,010 °F; 1,370 K) (anhydrous)
Solubility product (Ksp)	2.36×10−6
Solubility	insoluble in ethanol, ether; ; dissolves in HF
Magnetic susceptibility (χ)	+9500.0·10−6 cm3/mol
Structure
Crystal structure	Rutile (tetragonal), tP6
Space group	P42/mnm, No. 136
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Causes severe skin burns & eye damage; ; Hazardous decomposition products formed under fire conditions- Iron oxides
	GHS labelling:
Pictograms
NFPA 704 (fire diamond)	4 0 2 COR
Flash point	not applicable
Related compounds
Other anions	Iron(II) chloride; Iron(II) bromide; Iron(II) iodide; Iron(II) oxide
Other cations	Manganese(II) fluoride; Cobalt(II) fluoride
Related compounds	Iron(III) fluoride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iron(II) fluoride or ferrous fluoride is an inorganic compound with the molecular formula FeF₂. It forms a tetrahydrate FeF₂·4H₂O that is often referred to by the same names. The anhydrous and hydrated forms are white crystalline solids.

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