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O: Fachverband Oberflächenphysik

O 89: Metal substrates: Adsorption of organic / bio molecules V

O 89.2: Vortrag

Freitag, 30. März 2012, 10:45–11:00, A 053

STM study of molecular structures of bis(phthalocyaninato)-lutetium(III) on crystalline substrates — •Lars Smykalla, Pavel Shukrynau, and Michael Hietschold — Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany

Results of the adsorption and formation of self-assembled ordered molecular structures of the double-decker phthalocyanine molecule bis(phthalocyaninato)lutetium(III) on the anisotropic metallic surface of an Ag(110) single crystal and on highly oriented pyrolytic graphite (HOPG) are reported. We used a variable temperature scanning tunneling microscope (STM) at 30 K and room temperature under ultrahigh vacuum conditions to image the molecules with submolecular resolution. The electronic properties were investigated with scanning tunneling spectroscopy and density functional theory calculations for single molecules. The observed molecular structures and scanning tunneling spectroscopy results for both different substrates are compared to gain a better understanding of the influence of the surface on the adsorbed molecules. From this we can conclude that for the molecular arrangement the molecule-molecule interactions are dominant. However, the stronger molecule-substrate interaction for metal substrates compared to the weakly interacting HOPG was found to lead to a new structure with an alternating rotation of the molecules relative to the lattice vectors.