Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: POSTERS Colloids, Nanoparticles and Aggregates
CPP 21.9: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
To be or not to be - included? Heterogeneous Molecular Structures Probed by STM — K. Gruber1, C. Rohr1, M. Malarek2, L. J. Scherer2, C. E. Houscroft2, E. C. Constable2, and •B. A. Hermann1 — 1Dept. of Physics / CeNS, LMU Munich and WMI, Walther-Meissner-Str. 8, 85748 Garching, Germany — 2Dept. of Chemistry, Uni. of Basel, Spitalstrasse 51, 4056 Basel, Switzerland
Complex molecular structures, e.g as are apparent in supramolecular chemistry, typically assemble through interactions mediated by weak intermolecular forces. Weak refers here to an interaction lower in strength than a covalent bond. Especially heterogeneous assemblies are of growing interest for biological and chemical processes as well as for technical applications and provide important contribution to the design of nanodevices such as small molecular machines. All heterogeneous assemblies presented in this poster are based on weak interactions of smaller inclusion molecules with Fréchet-dendrons. While adamantene could be successfully incorporated into existing patterns (host-guest structures), heterogeneous assemblies with the inclusion compound coronene resulted in the formation of a new (polymorph) molecular arrangement. The new polymorph pattern could further be influenced by employing two other molecules of slightly modified chemical structure, benzoperylene and benzopyrene, missing two and four carbon atoms, respectively. This work impressively demonstrates the versatility of the Fréchet-dendrons, allowing a high degree of control of heterogeneous structures and presents a first step towards controlled multilayer, multicomponent self-organization of complex systems.