Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Metal substrates: Adsorption of organic / bio molecules VI

O 49.6: Vortrag

Mittwoch, 16. März 2011, 16:15–16:30, PHY C213

Phase separation of cobalt- and 2H-tetraphenylporphyrin on Cu(111): A Scanning Tunneling Microscopy Study — •Stefanie Gläßel, Elisabeth Zillner, Florian Buchner, Michael Röckert, Michael Stark, 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 understanding of the adsorption behavior of large organic molecules on surfaces is a prerequisite to utilize their functional properties either in single-molecule devices or in self-assembled supramolecular architectures. In this regard the discrimination of the corresponding molecule-molecule and molecule-substrate interactions are in the center of our scanning tunneling microscopy (STM) study at room temperature. While tetraphenylporphyrins (TPP) are known to form ordered square phases and intermix well on Ag(111) [1], on Cu(111) the separation of CoTPP and 2HTPP is observed [2]. This can be explained by the domination of attractive T-type interactions between adjacent CoTPP molecules and the domination of site specific molecule-substrate interactions for 2HTPP on Cu(111); the observed behavior can conclusively be interpreted as due to a coordinative bond between the iminic nitrogens and copper surface atoms.

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

[1] F. Buchner et al., Phys. Chem. Chem. Phys., 2010, 12, 13082-13090. [2] F. Buchner et al., submitted