Some new trimeric phosphoronitridic dihalides

Three new trimeric phosphoronitridic dihalides, P3N3Cl5Br, P3N3Cl4Br2, P3N3Cl2Br4, have been synthesized by the reaction of bromine-containing phosphorus halides with ammonium bromide and ammonium chloride. X-ray diffraction data, infra-red spectra and results of elemental analysis show these compounds to be trimeric, rather than tetrameric, in structure.