Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)
O 35.24: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B1
Dynamic studies of octaethylporphyrin Fe(III) chloride — •Dennis van Vörden1, Manfred Lange1, Merlin Schmuck1, Johannes Schaffert1, Roberto Robles Rodríguez2, and Rolf Möller1 — 1Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 2CSIC-ICN, Universitat Autňnoma de Barcelona 08193 Bellaterra, Barcelona. Spain.
The porphyrin molecule is an archetypal metallorganic complex, which is found in many biochemical molecules like chlorophyll, haemoglobin and cytochrome. Here we investigate submonolayer coverages of octaethylporphyrin Fe(III) chloride (Fe-OEP) on Cu(111) prepared in-situ-using a combined LT-scanning tunneling/atomic force microscope.
As a first step, the topography and the orientation of the Fe-OEP molecules is investigated. Two different appearances of the molecule (type A and B) can be found. Type A (unfilled) can be easily manipulated and is mainly found at step edges, while type B (filled) is found individually on the flat terrace.
The comparison of DFT-simulations and STM images reveals, that type A molecules can be identified as dechlorinated (Fe-OEP) while type B are intact octaethylporphyrin Fe(III) chloride molecules. This is further corroborated by the observation that type B molecules can be transformed to type A by an electric pulse which induces a dechlorination of the molecule.
The diffusion of the two types of molecules was studied by comparing different preparation, like evaporating the molecule to the surface at room temperature or direct to the cooled substrate.