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Nickel(II) cyanide

Chemical compound From Wikipedia, the free encyclopedia

Nickel(II) cyanide is the inorganic compound with a chemical formula Ni(CN)2. The trihydrate is a gray-green solid that is insoluble in most solvents including water, while the anhydrous form is a yellow solid.[2][3]

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Nickel(II) cyanide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.008.329 Edit this at Wikidata
EC Number
  • 209-160-8
UNII
UN number 1653
  • InChI=1S/2CN.Ni/c2*1-2;/q2*-1;+2
    Key: NLEUXPOVZGDKJI-UHFFFAOYSA-N
  • [C-]#N.[C-]#N.[Ni+2]
  • tetrahydrate: [C-]#N.[C-]#N.O.O.O.O.[Ni+2]
Properties
Ni(CN)2
Molar mass 110.729 g/mol
Appearance yellow-brown solid (anhydrous)
blue gray solid (tetrahydrate)[1]
insoluble
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazardGHS09: Environmental hazard
Danger
H317, H334, H350, H372, H410
P201, P202, P260, P264, P270, P272, P273, P280, P281, P285, P302+P352, P304+P341, P308+P313, P314, P321, P333+P313, P342+P311, P363, P391, P405, P501
Related compounds
Other cations
 Iron(II) cyanide
Cobalt(II) cyanide
Related compounds
 Potassium cyanonickelate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Production

Addition of two equivalents of sodium or potassium cyanide to a solution of nickel(II) ions in aqueous solution leads to the precipitation of nickel(II) cyanide trihydrate.[4] On heating the trihydrate to 140 °C, this hydrate converts to anhydrous nickel(II) cyanide.[2][3]

Chemical properties

K2[Ni(CN)4] (tetracyanonickelate) solution)

Nickel(II) cyanide dissolves in potassium cyanide solution to produce a yellowish solution containing potassium tetracyanonickelate:[2][4]

Ni(CN)2 + 2 KCN → K2[Ni(CN)4]

Nickel(II) cyanide will react with dimethylglyoxime (dmgH2) and produce hydrogen cyanide:[5]

Ni(CN)2 + 2 dmgH2 → Ni(dmgH)2 + 2 HCN

See also

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