Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Focussed Session: Towards a Quantitative Understanding of Complex Adsorption Structures: Surface Science goes Organic I

O 55.4: Talk

Wednesday, April 2, 2014, 17:00–17:15, TRE Phy

XPS and TPD of small molecules adsorbed on metalloporphyrins — •Matthias Franke, Michael Röckert, Quratulain Tariq, Ole Lytken, and Hans-Peter Steinrück — Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II

We are using a surface science approach to study the binding of small molecules to porphyrin metal centers. These interactions are widely encountered in nature, but also provide the basis for many kinds of chemical sensors [1]. Despite the number of theoretical studies on this topic, the results still remain inconsistent [2] and need further experimental data.

We have been adsorbing O2, CO and NO on multilayers of cobalt(II)-tetraphenylporphyrin. Changes in the chemical environment of the metal center were investigated with X-ray Photoelectron Spectroscopy (XPS), while Temperature Programmed Desorption (TPD) was used to measure the strength of the chemical bond between the metal centers and the adsorbed molecules. NO was found to adsorb strongly, with a desorption peak above room temperature, whereas O2 and CO both adsorb much weaker and desorb already below 150 K.

[1] Di Natale, C; Monti, D.; Paolesse, R.; materials today,

2010, 13, 7-8

[2] Shubina, E. T.; advances in inorganic chemistry, 2010, 62, 279