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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 114: Nanostructures at surfaces: 1D and 2D structures and networks IV

O 114.3: Talk

Friday, March 16, 2018, 11:00–11:15, MA 141

On-surface transmetalation of porphyrinsDiana Hötger1, •Markus Etzkorn1,2, Claudius Morchutt1, Patrick Alexa1, Doris Grumelli3, Jan Dreiser4, Heriberto Fabio Busnengo5, Paula Abufager5, Sebastian Stepanow6, Rico Gutzler1, and Klaus Kern1,71Max Planck Institut für Festkörperforschung, Stuttgart, Germany — 2Institut für Angewandte Physik, Technische Universität Braunschweig, Germany — 3Universidad Nacional de La Plata, Argentina — 4Paul Scherrer Institute, Swiss Light Source, Villigen, Switzerland — 5Insituto de Física, Rosario, Argentina — 6Swiss Federal Institute of Technology Zurich, Switzerland — 7Institut de Physique, Ecole Polytechnique Fédérale de Lausanne, Switzerland

We have investigated the transmetalation of metal porphyrin monolayer networks self-assembled on Au(111) using X-ray absorption, scanning tunneling microscopy and DFT studies. In the X-ray absorption the coordinated metal centers show the expected clear multiplet structure as a result of the ligand field. When depositing Co on the networks formed by Fe-porphyrins at room temperature, we find strong evidence of an efficient metal cation exchange in the spectra. The Co absorption spectra now show a clear multiplet structure similar to the one of Co-porphyrins while the Fe spectra become much more metallic in character. The process is unidirectional as we find no signs of transmetalation for Fe deposited on Co-porphyrins. We have also observed similar signatures of transmetalation for Cu-porphyrins when depositing Co. The latter finding illustrates the differences to transmetalation in solution.

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