Based on experimental evidence, the structure of this polymeric material is thought to be rather irregular, with most of the carbon atoms being of sp 2 type and localized domains of π conjugation. Paracyanogen can also be converted back to cyanogen by heating to 800 ☌ (1,470 ☏).

It can also be prepared by the polymerization of cyanogen at 300 to 500 ☌ (572 to 932 ☏) in the presence of trace impurities. It can also be prepared by heating silver cyanide, silver cyanate, cyanogen iodide or cyanuric iodide. It can be best prepared by heating mercuric cyanide. Isocyanogen (or cyanoisocyanogen) is NCNC, diisocyanogen is CNNC, and diazodicarbon is CCNN. There are less stable isomers in which the order of the atoms differs. It is also formed when nitrogen and acetylene are reacted by an electrical spark or discharge. Industrially, it is created by the oxidation of hydrogen cyanide, usually using chlorine over an activated silicon dioxide catalyst or nitrogen dioxide over a copper salt.

2 CuSO 4 + 4 KCN → (CN) 2 + 2 CuCN + 2 K 2SO 4 One laboratory method entails thermal decomposition of mercuric cyanide:Īlternatively, one can combine solutions of copper(II) salts (such as copper(II) sulfate) with cyanides an unstable copper(II) cyanide is formed which rapidly decomposes into copper(I) cyanide and cyanogen. Cyanogen is typically generated from cyanide compounds.

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