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Cupric cyanide, Cu(CN)2

The Cupric cyanide, Cu(CN)2, is obtained as a brownish-yellow precipitate by the interaction of solutions of potassium cyanide and cupric sulphate, but it is very unstable, decomposing at ordinary temperatures into cupric cuprous cyanide, Cu[Cu(CN)2]2,5H2O, with evolution of cyanogen. On heating, it is converted into cuprous cyanide. With hydrazine cyanide it unites to form a monohydrazinate, Cu(CN)2,N2H4, yellow needles insoluble in water, m.p. 160° to 162° C.
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