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O: Fachverband Oberflächenphysik

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

O 85.2: Vortrag

Freitag, 26. März 2010, 11:30–11:45, H36

Complex nanoporous networks from flexible functionalised porphyrin units — •David Écija¹, Knud Seufert¹, Willi Auwärter¹, Claudia Aurisicchio², Davide Bonifazi², Daniel Heim¹, 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

Porous materials are attracting wide interest because of the presence of cavities, which can selectively accomodate guest species. Here we report on a low temperature STM study of the formation of two different bidimensional supramolecular porous networks made of trans- and cis-like porphyrin derivatives on Ag(111) in ultra high vacuum. In either case, there is a high level of homogeneity in the pore size, shape and chemical composition, as required for applications. The trans-like porphyrin self-assembles into a hexagonal porous network, with an inter-pore distance of 5.3 nm and a pore area of 0.9 nm2. Chirality plays a major role, giving as a result two different domains, each of them made of only one kind of enantiomer. The cis-like species self-assembles into a Kagomé porous network, with an interpore distance of 4.8 nm and a pore area of 0.28 nm2.

Due to the donor character of the molecular species involved, on going experiments are focused on the deposition of acceptor molecules on top of the porous templates, with the idea of improving the efficiency of new kind of organic solar cells.