Double Nickel Chlorides

Nickel chlorides unite with the chlorides of many other metals, particularly the alkali metals and ammonium, to form double salts. Chief amongst these are nickel ammonium chloride, NH₄Cl.NiCl₂.6H₂O, which occurs as green, monoclinic crystals. Nickel lithium chloride, LiCl.NiCl₂.6H₂O, yields deliquescent, golden prisms. Monocaesium and dicaesium nickel chlorides, CsCl.NiCl₂ and 2CsCl.NiCl₂, respectively, have been prepared, and a yellow dirubidium nickel chloride, 2RbCl.NiCl₂. Other double chlorides are known, but their importance is small.