V2Cu3Ga8, Mo2Cu3Ga8 and W2Cu3Ga8-New compounds with a novel order variant of a bcc packing and motifs of self-similarity

Threefold capped cubes TMCu3Ga8 are the coordination polyhedra in the new compounds TM2Cu3Ga8 (TM=V, Mo, W) which were synthesised from the elements. The new crystal structure can be described as an ordered defect variant of the bcc packing: [(TM)2(Cu)3(□)3][Ga8]. As a motif of self-similarity the polyhedra itself are packed in the same way.