Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 14: Oxide Surfaces: Adsorption and Reactivity

O 14.6: Talk

Monday, March 16, 2015, 16:15–16:30, MA 042

Carboxylic Acid Deprotonation on MgO(100) — •Quratulain Tariq, Matthias Franke, Michael Röckert, Hans-Peter Steinrück, and Ole Lytken — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, 91058 Erlangen, Egerlandstraße 3, Germany

Chemical functionalization of surfaces provides unique routes to obtain nanoscale supramolecular architectures, for novel technological applications. Only few attempts have been made to functionalize metal oxide surfaces by adsorption of organic molecules. A promising class of molecules to form supramolecular structures are aromatic carboxylic acids. Such species have been studied previously, on a variety of surfaces and both flat-lying and upright-standing adsorption configurations are possible. In the present work, we investigate the adsorption of phthalic acid (C6H4(COOH)2) on MgO(100) thin films on Ag(100), as a function of temperature and coverage, by X-ray photoemission spectroscopy (XPS), ultraviolet photoemission spectroscopy (UPS), near-edge X-ray absorption fine structure (NEXAFS) and temperature programmed desorption (TPD). We find deprotonation of both carboxyl groups of the phthalic acid molecule upon heating and formation of a bidentate species with an upright standing orientation, stable between 350 and 500 K. The project is supported by the DFG through FOR 1878 (funCOS).