Nickel(II) fluoride

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Nickel(II) fluoride
Fluorid nikelnatý.PNG
Nickel(II)-fluoride-unit-cell-3D-balls.png
Names
IUPAC name
Nickel(II) fluoride
Identifiers
10028-18-9 YesY
ChemSpider 23210 YesY
EC number 233-071-3
Jmol-3D images Image
PubChem 24825
RTECS number QR6825000
Properties
NiF2
Molar mass 96.6902 g/mol
Appearance Yellowish to green tetragonal crystals
Density 4.72 g/cm3
Melting point 1,474 °C (2,685 °F; 1,747 K) [2]
Boiling point 1,750 °C (3,180 °F; 2,020 K) [1]
4 g/100 mL
Solubility insoluble in alcohol, ether
Structure
Rutile
Nickel: Octahedral
Oxygen: Trigonal planar
Hazards
Safety data sheet External MSDS
Related compounds
Other anions
Nickel(II) chloride
Nickel(II) bromide
Nickel(II) iodide
Other cations
Cobalt(II) fluoride
Copper(II) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Nickel(II) fluoride is the chemical compound with the formula NiF2. Unlike many fluorides, NiF2 is stable in air. NiF2 comprises the passivating surface that forms on nickel alloys, e.g. monel, which is why such materials are good to store or transport hydrogen fluoride or elemental fluorine. Nickel is one of the few materials that can be used to store fluorine because it forms this coating. 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:[3]

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 because its +3 oxidation state is less stable. Chloride is more easily oxidized than nickel(II). This is a typical halogen displacement reaction, where a halogen plus a less active halide makes the less active halogen and the more active halide. Nickel(II) fluoride is also produced when fluorine reacts with nickel metal.

A melt of NiF2 and KF reacts to give the green compound K2[NiF4]. The structure of this material is closely related to some superconducting oxide materials.[4]

Nickel(II) fluoride reacts with strong bases to make nickel(II) hydroxide, a green colored compound.

NiF2 + 2 NaOH → Ni(OH)2 + 2 NaF

References[edit]

  1. ^ http://www.indiamart.com/primechemicals/inorganic-fluorine.html
  2. ^ http://www.slac.stanford.edu/BFROOT/www/Detector/Backgrounds/BkG4Sim/Planning/Validations/neutronCounters/04_02_85.pdf
  3. ^ Priest, H. F. “Anhydrous Metal Fluorides” Inorganic Syntheses McGraw-Hill: New York, 1950; Vol. 3, pages 171-183.
  4. ^ Balz, D. "Über die Struktur des K2NiF4" Naturwissenschaften 1953, page 241.

External links[edit]