Regensburg 2010 – scientific programme
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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 59.83: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Cobalt porphyrin and phthalocyanine complexes on Ag(111) and Au(111): Interfacial coordination interactions — •Yun Bai, Martin Schmid, Michael Sekita, Thomas Bischof, Hans-Peter Steinrück, and Michael Gottfried — Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II
Metalloporphyrins and metallophthalocyanines are of increasing technological interest due to their potential applications in heterogeneous catalysis, sensor systems, photovoltaics and organic electronics. In most of these applications the interfacial electronic interactions and the chemical bonds between the metal complexes and a solid substrate (metal or oxide) plays an important role. To obtain fundamental insight especially into the contributions of the coordinated metal centers to the surface chemical bond, we studied monolayers of cobalt(II)-phthalocyanine (CoPc), cobalt(II)-octaethylporphyrine (CoOEP), and cobalt(II)-tetraphenylporphyrine (CoTPP), adsorbed on Ag(111) and Au(111), using XPS and UPS. On Ag(111), uniform core level shifts and the appearance of a new valence state indicate that the Co ions interact strongly with the substrate and that the interactions are laterally homogenous, i.e., virtually all Co ions interact in a same way with the Ag substrate. On Au(111), however, a split Co 2p3/2 signal suggests the presence of two different cobalt species in the monolayer. This observation is discussed in the context of the herringbone reconstruction of the Au(111) surface, which leads to lateral variations of geometric and electronic structure and thus potentially different adsorption sites. Supported by the DFG through SFB 583.