Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 85.3: Vortrag

Freitag, 26. März 2010, 11:45–12:00, H36

Strategies to fabricate molecular architectures by local anchoring and functionalization of porphyrins — Florian Buchner, Elisabeth Zillner, Michael Röckert, Stefanie Gläßel, Hans-Peter Steinrück, and •Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-University Erlangen-Nuremberg, Egerlandstr. 3, 91058 Erlangen

For the generation of functional molecular devices the ultimate goal is the control of the position, supramolecular arrangement, intramolecular conformation and electronic coupling of the molecular building blocks to the substrate. Porphyrins appear to be ideal building blocks to generate such devices on surfaces, since they combine an active site, usually a coordinated metal center, with a planar, structure forming element. In this contribution we discuss scanning tunneling microscopy (STM) investigations of the dynamics, supramolecular ordering and intramolecular conformation of different porphyrins on Ag(111), Cu(111) and composite surfaces in ultra-high vacuum, mainly at room temperature. The presented data enables the understanding of the role of molecule-molecule and molecule-substrate interactions. The obtained findings indicate the possibility to locally anchor and/or functionalize (e.g. metalate) the porphyrins on surfaces prestructured with metallic or oxygen islands. Based on these results a technique for large scale patterning with the corresponding molecules will be proposed. This work has been funded by the DFG through Sonderforschungsbereich 583.