N-Chlorobistrifluoromethylamine reacts with cyanogen chloride on irradiation to give bistrifluoromethylaminocarbylamine chloride, (CF3)2N·N:CCl2. Fluorination of the carbylamine chloride with sodium fluoride gives (C3F8N2)2; a structure for the dimer is proposed. Reaction with mercuric fluoride produces a crystalline mercurial, [(CF3)2N·N(CF3)]2Hg. Perfluorohexamethyltetrazine, N-bromotristrifluoromethylhydrazine, tristrifluoromethylhydrazine, and N-nitrosotristrifluoromethylhydrazine have been prepared from the mercurial by reactions with halogen-containing compounds.