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O: Fachverband Oberflächenphysik

O 6: Organic/bio Molecules on Metal Surfaces I

O 6.3: Talk

Monday, March 31, 2014, 11:00–11:15, TRE Phy

Tuning the electronic structure of metal-organic complexes at the molecule-substrate interface — •Pascal Raphael Ewen¹, Jan Sanning¹, Nikos Doltsinis², Cristian Alejandro Strassert¹, and Daniel Wegner¹ — ¹Physikalisches Institut, Westfälische-Wilhelms Universität Münster, Deutschland — ²Institut für Festkörpertheorie, Westfälische-Wilhelms Universität Münster, Deutschland

The coupling of molecules at surfaces ranging from the weak (physisorption) to the strong interaction regime (chemisorption) plays a crucial role both in the physical and chemical behavior. Fundamental processes such as conformal changes, dissociation and charge transfer have been observed upon adsorption. A systematic investigation of the adsorption and the electronic structure of slightly differing phosphorescent Pt(II) complexes offers information about the influence of ligands and substituents on their interactions with neighbors and the substrate. We have studied the impact of molecule-surface and intermolecular interactions on the self-assembly and electronic structure of Pt-complex monolayers on Au(111) using scanning tunneling microscopy (STM) and spectroscopy (STS) at low temperature. By determining energies and spatial distributions of several frontier orbitals, we are able to evaluate the impact of coupling and hybridization on the molecular electronic states.