Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. 6/1999)
The cover picture shows the structure of octasupersilyldodecaindane (tBu3i)8In12 in the crystal (supersilyl - SitBu3; for clarity the tBu groups are omitted in the cover picture). This compound. whose structure could represent a new emblem for the city of Brussels, was synthesized by thermolysis of diindane (tBu3Si)2In-In(SitBu3)2 at 100°C in heptane and isolated as black-violet platelets from benzene. It exhibits the longest E12 deltapolyhedron framework observed for boron and its homologues so far; the longitudinal diameter of 750 pm approaches the realm of nanostructured materials. The In12 cluster consists of two distorted octahedral In6 building blocks, which when considered as separate (tBu3Si)4In6 entities can be classified as closo compounds. Thus, (tBu3Si)8In12 can be described as a conjiincto indane. Further details of this compound are provided by N. Wiberg et al. on pages 839–841.