Synthesis and structure of bismuth complexes [Ph4P]4[Bi8I28], [Ph4P]2[Bi2I8·2Me2S=O]·2Me2S=O, [(Me2S=O)8Bi][Bi2I9]

Complexes [Ph4P]2[Bi2I8(Me2S=O)2]·2Me2S=O (I) and [Ph4P]4[Bi8I28] (II) were obtained by the reaction of tetraphenylphosphonium iodide with bismuth triiodide in DMSO and acetone, respectively. Dissolving bismith iodide in DMSO resulted in the formation of complex [(Me2S=O)8Bi][Bi2I9] (III). Reactions of complexes II or III with tetraphenylphosphonium iodide in DMSO yielded complex I. The structure of the obtained bismuth complexes was confirmed by X-ray diffraction data.