Nickel dicyanide
Nickel dicyanide is the inorganic compound with a chemical formula Ni(CN). It is a gray-green solid that is insoluble in most solvents. 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 tetrahydrate. On heating the tetrahydrate to 140 °C, this hydrate converts to anhydrous nickel(II) cyanide. Chemical properties. Nickel(II) cyanide dissolves in potassium cyanide solution to produce a yellowish solution containing potassium tetracyanonickelate: Nickel(II) cyanide will react with dimethylglyoxime (dmgH) and produce hydrogen cyanide: