Ba5AlIr2O11: Eine neue Verbindung mit Iridium(IV,V)

Ba₅AlIr₂O₁₁: A New Compound with Iridium(IV, V) The hitherto unknown compound Ba₅AlIr₂O₁₁ was prepared and investigated by X-ray technique (space group D–Pnma, a = 18.8360; b = 5.7887; c = 11.1030 Å; Z = 4). Iridium has an octahedral coordination in each case two octahedra are connected by a plane. These double octahedra form with corner connected AlO₄ tetrahedra Ir₂AlO₁₁]^10? units. Ba₅AlIr₂O₁₁ is not related to the perovskite type compounds.