Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Structure of Solid/Liquid Interfaces I

O 82.8: Vortrag

Donnerstag, 10. März 2016, 12:15–12:30, H6

Porphyrin Metalation at the Solid-Liquid Interface — •Matthias Franke1, Florencia Marchini2, Hans-Peter Steinrück1, Ole Lytken1, and Federico José Williams21Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Germany — 2Departamento de Química Inorganica, Analítica y Química Física, Universidad de Buenos Aires, Argentina

Porphyrins are large organic molecules with potential in numerous technical applications. Especially metalloporphyrins are promising, since the metal center coordinated to the central cavity strongly influences the functionality of these molecules. So far, on-surface metalloporphyrin synthesis in ultrahigh vacuum has been achieved by codeposition of metal atoms and subsequent annealing. However, the common way to metalate porphyrins in liquid medium is through deprotonation and coordination of a dissolved metal ion. We have transferred the liquid phase synthesis approach to the surface by metalating a free-base porphyrin (2HTPP), adsorbed on an Au(111) single crystal, by exposure to aqueous zinc acetate solution, yielding ZnTPP.[1] This reaction happens at room temperature, in contrast to the higher temperatures required for metalation by codeposited metal atoms. Metalation was followed spectroscopically by means of X-ray photoelectron spectroscopy (XPS). The project is supported by the DFG through FOR 1878 (funCOS) and by the DAAD.

[1] Franke, M.; Florencia, M.; Steinrück, H.-P.; Lytken, O.; Williams, F.; J. Phys. Chem. Lett. 2015, accepted, DOI: 10.1021/acs.jpclett.5b02218

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