Nickel(II) iodide

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Nickel(II) iodide
Nickel(II) iodide hexahydrate, NiI2•6H2O
Nickel(II) iodide
Names
IUPAC name
Nickel(II) iodide
Other names
Nickelous iodide
Identifiers
3D model (
JSmol
)
ECHA InfoCard
 100.033.319 Edit this at Wikidata
UNII
  • InChI=1S/2HI.Ni/h2*1H;/q;;+2/p-2
  • [Ni](I)I
Properties
I2Ni
Molar mass 312.5023 g·mol−1
Appearance iron-black solid (anhydrous)
bluish-green solid (hexahydrate)
Density 5.384 g/cm3
Melting point 780 °C (1,440 °F; 1,050 K) (anhydrous)
43 °C (hexahydrate, loses water)
124.2 g/100 mL (0 °C)
188.2 g/100 mL (100 °C)
Solubility alcohols
+3875.0·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
Related compounds
Other anions
 nickel(II) chloride, nickel(II) bromide, nickel(II) fluoride
Other cations
copper iodide
,
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Nickel(II) iodide is an

aquo complex [Ni(H2O)6]I2 (image above).[2] This bluish-green colour is typical of hydrated nickel(II) compounds. Nickel iodides find some applications in homogeneous catalysis
.

Structure and synthesis

The anhydrous material crystallizes in the CdCl2 motif, featuring octahedral coordination geometry at each Ni(II) center. NiI2 is prepared by dehydration of the pentahydrate.[3]

NiI2 readily hydrates, and the hydrated form can be prepared by dissolution of nickel oxide, hydroxide, or carbonate in hydroiodic acid. The anhydrous form can be produced by treating powdered nickel with iodine.[4]

Applications in catalysis

NiI2 has some industrial applications as a

catalyst in carbonylation reactions.[5] It is also has niche uses as a reagent in organic synthesis, especially in conjunction with samarium(II) iodide.[6]

Like many nickel complexes, those derived from hydrated

nickel iodide have been used in cross coupling.[7]

NiI2 as the Ni(II) precatalyst in the aryl iodide and alkyl iodide cross coupling

References

  1. ISBN 0-8493-0486-5
    .
  2. doi:10.1016/0022-4596(73)90157-6
    .
  3. ISBN 9780470132449
    .
  4. OCLC 46170372.{{cite book}}: CS1 maint: location missing publisher (link
    )
  5. doi:10.1002/14356007.a05_217
    .
  6. ISBN 978-0471936237
    .
  7. PMID 20047282
    .
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