Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 85: Metal substrates: Adsorption of organic / bio molecules VII

O 85.7: Vortrag

Freitag, 26. März 2010, 12:45–13:00, H36

Surface-assisted assembly of discrete porphyrin-based cyclic supramolecules — •Daniel Heim¹, Knud Seufert¹, Willi Auwärter¹, Claudia Aurisicchio², Chiara Fabbro³, Davide Bonifazi^2,3, and Johannes V. Barth¹ — ¹Physik Department, E20, Technische Universität München, James-Franck Str. 1, D-85748 Garching, Germany — ²Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium — ³Department of Pharmaceutical Sciences, University of Trieste, Piazzale Europa 1, I-34127 Trieste, Italy

We employed de novo synthesized porphyrin modules to construct discrete cyclic supramolecular architectures supported on a copper (111) surface. Hereby, porphyrin derivates exhibiting either one or two functional pyridyl recognition groups, the latter being cis-like and trans-like isomers, were applied. The programmed geometry and functionality of the molecular modules together with their conformational flexibility and substrate interaction yields symmetric discrete assemblies, including dimers and chains as well as three- to six-membered cyclic structures. The area of the molecular cavities is extended by creating bicomponent structures combining building blocks with different symmetry. All these supramolecular architectures are stabilized by Cu surface atom mediated attractive pyridyl-pyridyl interactions. The resulting strength of the intermolecular interactions allows for conformational changes of the entire assemblies by STM manipulation.