Angewandte Chemie International Edition

Cover image for Vol. 54 Issue 33

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPlusChem, Zeitschrift für Chemie

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

36_17/1997The cover picture shows the novel anion[B12(BSe3)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 B12 icosahedron is coordinated by a selenium atom of one of the six trigonal-planar BSe3 units (depicted as ball-and-stick models). The electron count of the molecular anion obeys Wade's rules. The bidentate binding mode of the BSe3 groups to the B12 polyhedra results in a novel type of planar five-membered B3Se2 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.

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