Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 32

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. 12/1993)

32_12/1993The cover picture shows a tennis ball as well as the structure of a dimer generated with the Insight II 2.2.0 program (Biosym Technologies) and optimized by using the Discover force field. The two halves of the structure are held together by hydrogen bonds (yellow dashed lines; C atoms green, N atoms blue, O atoms red, H atoms white). The symmetric monomers have 1,2,4,5-tetramethylenebenzene cores, to which are added two diphenylglycoluril units (the phenyl groups and the H atoms not involved in hydrogen bonds have been omitted for clarity). The two monomers are self complementary and are “interlocked” like the two halves of a tennis ball (in the picture the orientations of the tennis ball and of the dimer are orthogonal to each other). More about this dimer which is even stable in the gas phase is reported by J. Rebek, Jr., J. de Mendoza, and R. Wyler on pages 1699 ff.

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