Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.26: Poster
Tuesday, March 12, 2013, 18:15–21:45, Poster B1
Monitoring the ring closure on the ligand of an Fe-Porphyrin molecule — •Gelavizh Ahmadi1, Valentin Müller1, Benjamin W. Heinrich1, José I. Pascual1,2, and Katharina J. Franke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
We used Scanning Tunneling Microscopy (STM) and Spectroscopy (STS) at 4.5K to follow the stepwise transformation of Fe-Octaethylporphyrin (FeOEP) into Fe-Tetrabenzoporphyrin (FeTBP) on Au(111). The annealing to 470 K of submonolayer coverages of FeOEP on Au(111) activates an electrocyclic ring closure of the ethyl groups at the organic ligand. We can identify different intermediate species by STM topography as well as by STS measurements. To double check the proposed reaction scheme, we also produced Fe-TBP by an in-situ metalation of free-base TBP on Au(111). This allows for an unambiguous identification of our product.