Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 31

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, ChemPhotoChem, ChemPlusChem, Zeitschrift für Chemie

Cover Picture (Angew. Chem. Int. Ed. Engl. 19/1995)

34_19/1995The cover picture shows a ball-and-stick model of the largest discrete cluster (700 heavy atoms) ever characterized by X-ray structure analysis. This cluster containing 154 molybdenum (blue), 532 oxygen (red), and 14 nitrogen atoms (green) has a relative molecular mass of about 24000. A related cluster is shown as a polyhedral representation in the middle of the cavity of the “big wheel”. Remarkably both clusters were obtained from the same reaction solution, though not as a host-guest compound as the picture may imply. Obvious questions arise regarding template effects, for example, by a fragment of the smaller cluster, and the limits of variability in the self-assembly of materials. Further details on this impressive cluster are given by A. Müller et al. on pages 2122–2124.

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