Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 19: Poster Monday: Organic Molecules on Inorganic Surfaces

O 19.1: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

On the adsorption behavior of free base tetranaphthylporphyrin on Cu(111): mobility, intramolecular conformation and chirality — •Stephen Massicot, Jan Kuliga, Rajan Adhikari, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

The controlled fabrication of molecular nanoarchitectures via bottom-up approach is an important objective within surface science. One of the most promising and extensively investigated class of adsorbates in that regard are porphyrins. In order to understand the adsorption behavior of porphyrins one has to closely study their adsorption geometry. In this study, we investigate the free-base tetranaphthylporphyrin (2HTNP) on Cu(111). Interestingly, 2HTNPs adsorb as individual molecules exhibiting an “inverted” conformation on the copper substrate, similar to the reports for the tetraphenylporphyrin. However, each napthyl group of a single 2HTNP molecule has two different orientations parallel to the surface. As a result five atropisomeric and two enantiomeric conformations can be found. Furthermore, a specific dynamic behavior, i.e. a migration of the adsorbed 2HTNP molecules along the three high symmetry regions of the substrate is observed at room temperature. After annealing to 400 K only one conformation is present on the surface and the molecules are static. However, after further annealing to 450 K the molecules become mobile again and some molecules additionally change the substrate directions.