Inside Cover: Toroidal Nanoobjects from Rosette Assemblies of Melamine-Linked Oligo(p-phenyleneethynylene)s and Cyanurates (Angew. Chem. Int. Ed. 25/2008)



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Nanodonuts form from hierarchical self-organization of a melamine featuring π-conjugated oligo(para-phenyleneethynylene)s with a cyanurate. The toroidal nanostructures, with a diameter of 40 nm (see AFM image), form in decane under dilute conditions. S. Yagai, A. Ajayaghosh et al. propose in their Communication on page 4691 ff. that a hydrogen-bonded rosette is an essential intermediate supramolecular species for such a hierarchical self-organization process. The background picture shows a “bubble ring” made by a scuba diver.