Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 53: Solid / liquid interfaces III

O 53.7: Talk

Wednesday, March 16, 2011, 16:30–16:45, WIL C107

Adsorption of phthalocyanine molecules on an iodide modified cu(100) electrode studied by means of in-situ stm and ex-situ xps — •Thanh Hai Phan¹, Stephan Breuer¹, Uwe Hahn², Thomas Torres², and Klaus Wandelt^1,3,4 — ¹Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstr. 12, D-53115 Bonn, Germany — ²Departamento de Quimica Organica C-I-305, Universidad Autonoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain — ³Institute of Experimental Physics, University of Wroclaw, Maxa Borna 9, 50-204, Wroclaw, Poland — ⁴Department of Physics, University of Rome Tor Vergata, Via Della Ricerca Scientifica 1, 00133 Rome, Italy

A combination of CV, in-situ STM and ex-situ XPS studies were performed to gain information about an iodide modified Cu(100) electrode surface exposed to an acidic electrolyte containing a redox-active phthalocyanine (abbreviated as [ZnPcPyMe]⁺⁴). In the CV, four single electron transfer steps were observed, which lead to the formation of tri-, di-, and mono-cations, respectively. The XPS data reveal not only the strong adsorption of molecules, but also the replacement of the zinc atoms by hydrogens. The well-ordered self-assembled adlayer of metal-free phthalocyanine seen in STM forms a (quasi) square-shaped lattice (angle of 92 ± 2^∘, intermolecular distance of 19.5Å) which coincide neither with the iodide nor with the copper lattice underneath. A detailed molecular structure model is proposed in agreement with the experimentally observed pattern.