Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 12: Inorganic/Organic Interfaces: Growth II

O 12.11: Talk

Monday, March 16, 2015, 17:30–17:45, MA 005

Massive conformational changes during thermally induced self-metalation of 2H-Tetrakis-(3,5-di-tert-butyl)-phenylporphyrin on Cu(111) — Michael Stark, Stefanie Ditze, Michael Lepper, Liang Zhang, Hannah Schlott, Florian Buchner, Michael Röckert, Min Chen, Ole Lytken, 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

Based on a combined scanning tunneling microscopy and X-ray photoelectron spectroscopy study we present detailed insights into pronounced changes of long-range order and intramolecular conformation during the self-metalation of 2H-5,10,15,20-Tetrakis-(3,5-di-tert-butyl)-phenylporphyrin (2HTTBPP) to CuTTBPP on Cu(111). 2HTTBPP adsorbed on Cu(111) at room temperature forms a peculiar entropically stabilized supramolecular ordered phase: the molecules arrange in alternating rows, with two distinct appearances in STM, which are assigned to concave and convex intramolecular conformations [1,2]. Upon metalation, the porphyrin literally "pops up" from the surface, due to a drastically reduced molecule-substrate interaction [3].

[1] S. Ditze et. al, JACS, 136 (2014) 1609

[2] H. Marbach, H.-P. Steinrück, Chem. Commun., 50 (2014) 9034

[3] M. Stark et al., Chem. Commun., 50 (2014) 10225