Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Organic-Inorganic Systems III: Metal-Organics
O 58.9: Talk
Wednesday, March 9, 2016, 17:15–17:30, S054
Metalation of porphyrin with Mg on Ag(100) — •Gianluca Di Filippo, Andrej Classen, Rebecca Pöschel, and Thomas Fauster — Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058, Erlangen, Germany
Porphyrins are a class of π-conjugated organic molecules of high technological interest. Their optical, electronic and chemical properties make them very suitable for energy production in solar cells, phototherapy, and catalysis [1]. Porphyrins are composed of a macrocycle of four pyrrole rings (C4H4N−) connected by methine units (=CH−). The nitrogen atoms at the interior form a central pocket ideal to incorporate metal atoms and to obtain metal-porphyrins by direct metalation of molecules adsorbed on inert metal surfaces [2].
Using X-Ray photoelectron spectroscopy (XPS) we investigated the in situ metalation of one monolayer tetraphenylporphyrin (2HTPP) on Ag(100) with Mg atoms. This reaction results in the formation of adsorbed magnesium(II)-tetraphenylporphyrin (MgTPP). The metalation is observed to take place either by evaporating Mg atoms on top of the 2HTPP monolayer or by depositing 2HTPP on top of the Ag surface with adsorbed Mg atoms. In the second case, the presence of oxygen contamination and consequent MgO formation reduces the efficiency at which Mg atoms are embedded in the molecule macrocycle.
[2] J.M. Gottfried et al., J. Am. Chem. Soc., 128, 5644 (2006) - F. Buchner et al., J. Phys. Chem. C, 112, 15458 (2008)