Chemical elements
    Physical Properties
      Nickel Fluoride
      Nickel Dichloride
      Double Nickel Chlorides
      Nickel Dibromide
      Nickel Di-iodide
      Nickel Chlorate
      Nickel Perchlorate
      Nickel Bromate
      Nickel Iodate
      Tri-nickel Suboxide
      Nickel Suboxide
      Nickel Monoxide
      Nickel Dihydroxide
      Nickelo-nickelic Oxide
      Nickel Dioxide
      Nickel Subsulphide
      Nickel Monosulphide
      Nickel Sesquisulphide
      Tri-nickel Tetrasulphide
      Nickel Disulphide
      Nickel Tetrasulphide
      Nickel Sulphite
      Nickel Thiosulphate
      Nickel Dithionate
      Nickel Sulphate
      Nickel Subselenide
      Nickel Selenide
      Nickel Sesquiselenide
      Nickel Selenite
      Nickel Sesquitelluride
      Nickel Tellurite
      Nickel Chromate
      Nickel Dichromate
      Double Nickel Chromates
      Nickel Molybdate
      Nickel Nitride
      Nickel Azoimide
      Nickel Nitrite
      Nickel Nitrate
      Di-nickel Phosphide
      Nickel Sesquiphosphide
      Nickel Diphosphide
      Nickel Triphosphide
      Nickel Hypophosphite
      Nickel Phosphite
      Nickel Metaphosphate
      Nickel Orthophosphate
      Nickel Pyrophosphate
      Nickel Thio-orthophosphate
      Nickel Thiopyrophosphite
      Nickel Thiopyrophosphate
      Tri-nickel Diarsenide
      Nickel Arsenide
      Nickel Diarsenide
      Nickel Arsenite
      Nickel Orthoarsenate
      Nickel Antimonide
      Nickel Antimonate
      Nickel Thioantimonite
      Nickel Vanadate
      Nickel Carbide
      Nickel Tetracarbonyl
      Nickel Carbonate
      Nickel Monocyanide
      Nickel Cyanide
      Nickel Thiocyanate
      Nickel Thiocarbonate Hexammoniate
      Nickel Subsilicide
      Nickel Orthosilicate
      Nickel Monoboride
      Nickel Borates
    PDB 1a5n-1g2a
    PDB 1g3v-1mn0
    PDB 1mro-1s9b
    PDB 1scr-1xmk
    PDB 1xu1-2cg5
    PDB 2cqz-2jih
    PDB 2jk8-2v4b
    PDB 2vbq-3c2q
    PDB 3c6c-3h85
    PDB 3hdp-3kvb
    PDB 3l1m-3o00
    PDB 3o01-4ubp
    PDB 8icl-9ant

Nickel Cyanide, Ni(CN)2

When potassium cyanide is added to a solution of a nickel salt, a green precipitate of Nickel Cyanide, Ni(CN)2, is produced. This readily dissolves in excess of the reagent, yielding potassium nickelo-cyanide, K2Ni(CN)4. Solutions of this salt contain the complex ion Ni(CN)4, so that the above formula is probably more correct than 2KCN.Ni(CN)2. It crystallises with one molecule of water, K2Ni(CN)4.H2O. Density 1.875 at 11°C., and 1.871 at 14.5° C. It is readily decomposed by the addition of sodium hypobromite, hydrated nickel peroxide being thrown down as a black precipitate. The corresponding cobalt salt is, in like circumstances, oxidised to the stable cobalti-cyanide which remains in solution. This fact is made use of in separating nickel and cobalt in qualitative analysis. Nickel does not yield stable salts corresponding to the ferro- and ferri-cyanides.

The tetrahydrate, Ni(CN)2.4H2O, separates after prolonged standing as steel-blue leaflets from a cold, aqueous solution of nickel sulphate, potassium cyanide, and ammonia.

On prolonged standing the ammoniacal solution of nickel cyanide deposits crystalline needles of the ammoniate, 2Ni(CN)2.2NH3.H2O. This, at 250° C., is converted into the anhydrous cyanide.

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