Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.9: Poster

Tuesday, March 15, 2011, 18:30–22:00, P4

Configurational and Electronic Switching of Single Azopyridine-Substituted Porphyrin Molecules — •Francesca Matino¹, Guillaume Schull², Umasish Jana³, Felix Köhler⁴, Rainer Herges⁴, and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — ²Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 (CNRS, Université de Strasbourg), 67034 Strasbourg, France — ³Department of Chemistry, Jadavpur University, Kolkata-700032, India — ⁴Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

Switching is an elementary step in many sophisticated functions, such as directed motion, pumping, information storage and processing, in the macroscopic world as well as at the molecular scale. For nanoscale applications of such functions, molecules have to be immobilized on solid supports in a well defined geometry and orientation, in order to achieve advanced and reproducible dynamic functions. Here we report on a new azopyridine functionalized porphyrin synthesized as a model switch for deposition on surfaces. The porphyrin platform provides bonding to the surface, some electronic decoupling and a defined orientation of the azopyridine unit. Two geometrically and electronically different states of single molecules on Au(111) were found and analyzed by Scanning Tunnelling Microscopy and Spectroscopy. Switching between two conformational states occurs upon tunneling of electrons through LUMO orbitals.