Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.39: Poster

Tuesday, March 17, 2015, 18:15–21:00, Poster B

On-surface reactions of porphin molecules on Au(111) — •Nino Hatter, Sonja Schubert, Benjamin W. Heinrich, and Katharina J. Franke — Institut für Experimentalphysik, Freie Universität Berlin, Berlin, Germany

Chemical reactions on surfaces are a key ingredient on the route towards molecular electronics. Yet, reactions on surfaces differ from gas- or liquid-phase reactions, as the surface may act catalytically or selectively, thereby changing the reaction barrier, the yield or the product. Porphin is the parent compound of the porphyrines and has a simple structure, consisting of a conjugated tetrapyrrole macrocycle.

Here, we present a scanning tunneling microscopy/spectroscopy (STM/STS) study of free-base porphin adsorbed on Au(111). Annealing the system to 620 K leads to the formation of covalently linked dimers, as was previously observed for porphin on Ag(111) [1]. We identify three different types of porphin dimers. Furthermore, we use on-surface metalation [2,3] to produce Fe-porphin and metalized dimers on Au(111). Using STS, we probe the electronic and magnetic properties of the free-base porphin, as well as the metalized porphin monomers and dimers.

[1] A. Wiengarten, et al., J. Am. Chem. Soc. 136, 9346 (2014)

[2] J.M. Gottfried, et al., J. Am. Chem. Soc. 128, 5644 (2006)

[3] W. Auwärter, et al., ChemPhysChem 8, 250 (2007)