Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Metal Substrates: Structure, Epitaxy and Growth

O 44.5: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

On the adsorption behavior of cyano-functionalized 2H-tetraphenylporphyrin derivatives on Cu(111): a scanning tunneling microscopy study — •Manuel Meusel, Michael Lepper, Julia Köbl, Michael Stark, Hans-Peter Steinrück, and Hubertus Marbach — Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

One important objective within surface science is the bottom-up fabrication of functional nanostructures via self-assembly of molecular building blocks. In this context, we study porphyrins as prototype functional molecules on surfaces and target the controlled modification to tweak their adsorption behavior. One method to tailor the properties of porphyrins is the attachment of functional groups. In this study, we compare the adsorption behavior of differently cyano-functionalized 2H-tetraphenylporphyrin (2H-TPP) derivatives on Cu(111) under ultra-high vacuum conditions by scanning tunneling microscopy. We observe a variety of binding motives ranging from isolated individual molecules over dimer formation to one-dimensional molecular chains. The corresponding adsorption behaviors can be correlated with the number and symmetry of the cyano groups. The results show that the functionalization of supramolecular building blocks is a well-suited method to influence the adsorption behavior. Latest results will be presented and discussed. This work was funded through DFG FOR 1878 (funCOS) under grant MA 4246/2 -1.