Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.65: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Atomic structures of absorbed Zn(ll) phthalocyanine on an iodide modified Cu(1 0 0) electrode — •Thanhhai Phan¹, Hahn Uwe², Thomas Torres², and Klaus Wandelt¹ — ¹Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstr.12, 53115 Bonn, Germany — ²Departamento de Quimica Organica c-i-305, Universidad Autonoma de Madrid, Campus de Canoblanco, 28049 Madrid, Spain

Combined Voltammetric and in-situ STM studies were employed to gain information about the structures of partially water-soluble ZnPcPyMe molecules covered on an iodide template. The flat-lying molecules form a square-lattice on a c(p × 2)–I superstructure modified Cu(1 0 0) within the double layer regime. The distance between molecules was estimated to be (1.95 ± 0.2) nm based on line-profile measurements. This molecular lattice is rotated by (62 ± 2)^∘ with respect to the [0 1 1] direction of the substrate, i.e. the commensurate direction of the iodide under layer. This clearly excludes a template effect of the substrate surface, but rather hints to a molecular self-assembly. Detailed molecular models are also proposed for two phases obtained in perfect agreement with the experimental observation.