Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 23

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. 1/1996)

35_01/1996The cover picture shows a space-filling model of the anionic cesocene triple-decker complex [Cp3Cs2]. The Cs centers in this strongly bent molecule are highly ionic. The chemistry of anionic metallocenes of main group elements is a rapidly growing field and such metallocenes are structurally as well as theoretically of interest. Mixing cyclopentadienyl alkali metal compounds with cyclopentadienyl anions results in degradation of the CpMCpM polymer chains into smaller units such as [Cp2M] and [Cp3M2]. A structural comparison of these alkali metallocene complexes with the isovalent neutral alkaline earth metallocenes gives additional information on the still not well-understood bonding characteristics. The picture was painted by Peter Brinkmann, Universität Konstanz, using a technique that combines pastels and watercolors. Chemetall GmbH, Frankfurt/Main (Germany), is kindly acknowledged for providing the funding for the color print. Further details on the structure of this complex are reported by S. Harder and M. H. Prosenc on p. 97 ff.

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