Formation and Characterization of [BrC(NMe2)2)][Br3] and [BrC(NMe2)2)]2[Br8] in Ionic Liquids

The polybromide salts [BrC(NMe2)2]2[Br8] and [BrC(NMe2)2][Br3] were synthesized in the ionic liquid [BMP][OTf] (1‐butyl‐1‐methyl‐pyrrolidinium triflate). The compounds were characterized by Raman, NMR, and X‐ray single crystal structure determination as well as quantum‐chemical calculations. The polybromide dianion [Br8]2– structure shows similarities to the very recently reported structure of the first octachloride [Cl8]2–.