Angewandte Chemie International Edition

Cover image for Vol. 56 Issue 47

Editor: Neville Compton; Editor Emeritus: Peter Gölitz

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. 9/1993)

32_09/1993The cover picture shows a space-filling model of C1398H1278, a dendrimer constructed from 127 phenylacetylene units, and one of the largest pure hydrocarbon synthesized to date. Moore et al. have thus broken their own record of C1134H1146 (Angew. Chem. Int. Ed. Engl. 1993, 32, 246). The rapid construction of this huge, shape-persistent(!) molecule—the monomers of each generation are identically colored—is the result of a novel synthetic strategy which combines a linear increase in monomer size per generation with the conventional convergent dendrimer growth method. The size of this fourth generation dendrimer spans over 125 Å, as indicated by molecular models and confirmed by size-exclusion chromatography. Dendrimers are not only interesting because of their unusual molecular architecture—the representation here, for example, is also reminiscent of objects whose size is orders of magnitude different such as snowflakes—but, above all, also as starting materials for novel functional materials. More on the production and characterization of this and related dendrimers are reported by Moore et al. on p.1354ff.; the boom in dendrimer chemistry is also illustrated by the work of Mülhaupt et al. (p.1306) and de Brabander-van den Berg et al. (p. 1308). Also from inorganic chemistry further adventurous sallies into the realm of “nanostructures” are reported: Fenske et al. (p.1303) have synthesized the discrete cluster complex [Cu146Se73(PPh3)30], which can be described as a phosphane-wrapped Cu2Se particle.

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