Cobalt(II) fluoride

Cobalt(II) fluoride
Names
IUPAC name
Cobalt(II) fluoride
Other names
cobalt difluoride
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.044
EC Number
  • 233-061-9
PubChem CID
RTECS number
  • GG0770000
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Co.2FH/h;2*1H/q+2;;/p-2 checkY
    Key: YCYBZKSMUPTWEE-UHFFFAOYSA-L checkY
  • InChI=1/Co.2FH/h;2*1H/q+2;;/p-2
    Key: YCYBZKSMUPTWEE-NUQVWONBAL
SMILES
  • F[Co]F
Properties
Chemical formula
 CoF2
Molar mass 96.93 g/mol
Appearance Red crystalline solid
Density 4.46 g/cm3 (anhydrous)
2.22 g/cm3 (tetrahydrate)
Melting point 1,217 °C (2,223 °F; 1,490 K)
Boiling point 1,400 °C (2,550 °F; 1,670 K)
Solubility in water
 1.4 g/100 mL (25 °C)
Solubility soluble in HF
insoluble in alcohol, ether, benzene
Magnetic susceptibility (χ)
 +9490.0·10−6 cm3/mol
Structure
Crystal structure
 tetragonal (anhydrous)
orthorhombic (tetrahydrate)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
3
0
0
Lethal dose or concentration (LD, LC):
LD50 (median dose)
 oral (rat): 150 mg/kg
Related compounds
Other anions
 cobalt(II) oxide, cobalt(II) chloride
Other cations
 iron(II) fluoride, nickel(II) fluoride
Related compounds
 cobalt trifluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references
Anhydrous cobalt(II) fluoride
Anhydrous cobalt(II) fluoride

Cobalt(II) fluoride is an inorganic compound with the formula CoF2. It is a pink paramagnetic solid.[1] Like some other metal difluorides, CoF2 crystallizes in the rutile structure, which features octahedral Co centers and planar fluorides.[2]

Preparation and reactions

Treating anhydrous cobalt chloride with hydrogen fluoride gives cobalt(II) fluoride:[3]

CoCl2 + 2 HF → CoF2 + 2 HCl

Tetrahydrated cobalt(II) fluoride is formed by dissolving cobalt(II) in hydrofluoric acid. The anhydrous fluoride can be extracted from this by dehydration. Other synthesis can occur at higher temperatures.[4]

Cobalt(II) fluoride reacts with fluorine to give cobalt(III) fluoride:

CoF2 + 0.5 F2 → CoF3

The latter is a catalyst for fluorination reactions.

References

  1. ^ Donaldson, John Dallas; Beyersmann, Detmar (2005). "Cobalt and Cobalt Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Vol. 52. pp. 363–472. doi:10.1002/14356007.a07_281.pub2. ISBN 978-3-527-30385-4. PMC 7682369. PMID 1960848.
  2. ^ Stout, J. W.; Reed, Stanley A. (1954). "The Crystal Structure of MnF2, FeF2, CoF2, NiF2 and ZnF2". J. Am. Chem. Soc. 76 (21): 5279–5281. doi:10.1021/ja01650a005.
  3. ^ W. Kwasnik; R. Sauer (1963). "Cobalt(II) Fluoride". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY,NY: Academic Press. p. 267.
  4. ^ J.C. Bailar (1973), Comprehensive Inorganic Chemistry, Pergoamon
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