Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Metal substrates: Adsorption of organic / bio molecules V
O 40.1: Vortrag
Mittwoch, 16. März 2011, 11:15–11:30, PHY C213
Bonding and metalation of 2H-TPP on the Cu(111) surface- a multitechnique study — •Katharina Diller1, Florian Klappenberger1, Klaus Hermann2, and Johannes V. Barth1 — 1Physik Department, E20, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
We report on the interaction of free base tetraphenylporphyrin (2H-TPP) molecules with the Cu(111) surface studied with a multitechnique approach combining x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure spectroscopy (NEXAFS) measurements with density functional theory (DFT) calculations. After the adsorption of 2H-TPP on Cu(111) at room temperature the spectroscopic signatures (XPS and NEXAFS) depend on the molecular coverage. Near to a saturated monolayer NEXAFS indicates a strongly deformed macrocycle and electron transfer into the LUMO. XPS reveals that the adsorbate is a free base porphyrin. After annealing both XPS and NEXAFS data show the signature of a metalloporphyrin with a relaxed macrocycle. DFT calculations corroborate the peak assignment used for the analysis of the XPS and the NEXAFS data and provide information on the electronic structure of isolated 2H-TPP and Cu-TPP molecules.