Nickel(II) fluoride
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Nickel(II) fluoride is the chemical compound with the formula NiF2. This yellow solid has a density of 4.72 g/cm3, melts at 1450 °C, and boils at 1740 °C. Unlike most fluorides, NiF2 is stable in air. Its CAS# is 10028-18-9. NiF2 comprises the passivating surface that forms on nickel alloys, e.g. monel, when such material are used to store or transport HF. It is also used as a catalyst for the synthesis of chlorine pentafluoride.
NiF2 is prepared by treatment of anhydrous nickel(II) chloride with fluorine at 350 °C:[1]
- NiCl2 + F2 → NiF2 + Cl2
The corresponding reaction of cobalt(II) chloride results in oxidation of the cobalt whereas nickel remains in the 2+ oxidation state after fluorination.
A melt of NiF2 and KF react to give the green compound K2NiF4. The structure of material is closely related to some superconducting oxide materials. [2]
[edit] References
- ^ Priest, H. F. “Anhydrous Metal Fluorides” Inorganic Syntheses McGraw-Hill: New York, 1950; Vol. 3, pages 171-183.
- ^ Balz, D. "Über die Struktur des K2NiF4" Naturwissenschaften 1953, page 241.
[edit] External links
- IARC Monograph "Nickel and Nickel compounds"
- National Pollutant Inventory - Flouride and compounds fact sheet
- National Pollutant Inventory - Nickel and compounds fact sheet
- Links to external chemical sources
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