Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Oxide and Insulator Surfaces: Adsorption I

O 72.2: Vortrag

Mittwoch, 22. März 2017, 10:45–11:00, WIL C107

Hungry Porphyrins: Protonation and Self-Metalation of Tetraphenylporphrin on TiO2(110) - 1 × 1 — •Julia Köbl1, Tao Wang2, Cici Wang2, Martin Drost1, Fan Tu1, Qian Xu2, Huanxin Ju2, Daniel Wechsler1, Matthias Franke1, Haibin Pan2, Hubertus Marbach1, Hans-Peter Steinrück1, Junfa Zhu2, and Ole Lytken11Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 — 2National Synchrotron Radiation Laboratory, 42 S Hezuohua Road, Hefei, 230029, China

In order to obtain a detailed understanding of organic electronic devices such as dye-sensitized solar cells, one has to characterize the interactions of organic molecules with oxide substrates at the atomic level. Thus, we have studied the adsorption and self-metalation of tetraphenylporphyrin (2HTPP) on TiO2(110) - 1 × 1 with X-ray Photoelectron Spectroscopy (XPS) and Scanning Tunneling Microscopy (STM). Upon adsorption at room temperature, the first monolayer of 2HTPP is protonated, forming porphyrin diacid (4HTPP2+). As the surface is heated to 400 K, all unprotonated 2HTPP molecules in the second layer metalate, forming titanyl tetraphenylporphyrin (TiOTPP), but the protonated molecules in the first layer stay intact. As the surface is heated further to 550 K even the protonated 4HTPP2+ molecules metalate and only TiOTPP remain on the surfacea. Supported by the DFG through FOR 1878 (funCOS), the Chinese Scholarship Council and BayCHINA.
aKöbl et al., Chemistry Select, 2016, 1, 6103 - 6105.

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