[NMe4][I4Br5]: A New Iodobromide from an Ionic Liquid with Halogen–Halogen Interactions

Tetramethylammonium tetraiodopentabromide [NMe4][I4Br5] was the first iodobromide synthesized and crystallized in an ionic liquid as well as in dichloromethane. The new iodobro-mides show different structure motives yet unknown from other nonahalides and can be better described as [(I2Br3)- · 2IBr]. The additional IBr units are connected by halogen-halogen interactions on the central V-shaped [I2Br3]-. The characterization was performed by Raman spectroscopy and single crystal X-ray structure determi-nation. Conductivity measurements, thermogravimetric analysis and quantum-chemical calculations completed the structural discussion.