Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.142: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

In situ metalation of 2H-tetraphenylporphyrins with copper substrate atoms on Cu(111): a scanning tunneling microscopy study — •Martin Drost, Stefanie Ditze, Michael Stark, Florian Buchner, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

The development of functional nanostructures requires a detailed understanding of the physical and chemical properties of the involved species. In this regard porphyrinoids appear to be ideal candidates. They can bear various peripheral ligands, which enables control over molecule/molecule and molecule/substrate interactions, and their reactivity can be modified by inserting specific metal atoms at the center of the macrocycle. Herein, we studied the in situ coordination reaction of 2H-tetraphenylporphyrin molecules (2HTPP) with copper substrate atoms under ultra high vacuum conditions with scanning tunneling microscopy. The experiment reveals that 2HTPP molecules deposited on Cu(111) react to form metaloporphyrins (CuTPP) at 400K, by incorporation of substrate Cu atoms. While at room temperature, 2HTPP shows a specific 1D diffusion behavior of individual molecules, after partial metalation the coexistence with an ordered 2D CuTPP phase is found. To obtain detailed insight, a kinetic analysis of the metalation behavior as a function of time and temperature was performed.

This work has been funded by the DFG through Sonderforschungsbereich 583.