Supercubooctahedron (Cs6Cl)2Cs5 [Ga15Ge9Se48] Exhibiting Both Cation and Anion Exchange.

A novel type of supertetrahedral connectivity is exhibited by the 72-atom discrete supercubooctahedron in (Cs6Cl)2Cs5[Ga15Ge9Se48] (1), which undergoes both cation and anion exchange, as revealed by unambiguous single-crystal X-ray diffraction data. Electronic-structure studies helped to understand the Ge/Ga distribution.