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O: Fachverband Oberflächenphysik

O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)

O 55.44: Poster

Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F

STM / STS investigation of porphyrin and corrole molecules on surfaces — •Germar Hoffmann, Stefan Kuck, Jens Brede, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg

Porphyrins and corroles are metallo-organic compounds with a single metal ion in their central positions. Previous studies of porphyrin systems revealed unique electronic and magnetic features[1] making this class an interesting material for future spintronic devices. These spectroscopic features are influenced by the structural adsorption of the molecule on the surface. We employ scanning tunneling microscopy to compare the adsorption of tetra-phenyl-porphyrin and tri-phenyl-corrole revealing a saddle deformation of the molecule's aromatic core. The influence of the deformed molecular macrocycle on the molecular states near the Fermi energy is studied in detail by means of scanning tunnelling spectroscopy (STS). To investigate the metal-molecule interaction, molecules with different ligands and thin isolating layers of NaCl are employed to electronically decouple the molecules from the metallic substrate.

[1] H.Wende et al., Nature Materials, 6:516-519 (2007).