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.

Identifiers

CAS Number	7789-28-8 anhydrous^Y 13940-89-1 (tetrahydrate)^N
3D model (JSmol)	Interactive image
ChemSpider	74215^Y
ECHA InfoCard	100.029.232
PubChem CID	522690
UNII	NP4W87HLVO^Y
CompTox Dashboard (EPA)	DTXSID50894779
InChI InChI=1S/2FH.Fe/h21H;/q;;+2/p-2^Y Key: FZGIHSNZYGFUGM-UHFFFAOYSA-L^Y 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 (K_sp)	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). N verify (what is ^YN ?) Infobox references