Cover Picture (Angew. Chem. Int. Ed. Engl. 17/1997)

The cover picture shows the novel anion[B 12 (BSe 3 ) 6 ] 8− , which was synthesized as the cesium salt by a solid‐state reaction from the elements. The icosahedral species is the first example of a new class of polyhedral boron clusters that combines both the structural features of polyhedral boranes and boron chalcogenides. Each boron atom of the B 12 icosahedron is coordinated by a selenium atom of one of the six trigonal‐planar BSe 3 units (depicted as ball‐and‐stick models). The electron count of the molecular anion obeys Wade's rules. The bidentate binding mode of the BSe 3 groups to the B 12 polyhedra results in a novel type of planar five‐membered B 3 Se 2 rings. The synthesis, structure, and bonding of this first boron icosahedron with complete chalcogen substitution are described by B. Krebs et al. on pages 1903 ff.