Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Metal substrates: Adsorption of organic / bio molecules IV
O 30.5: Vortrag
Mittwoch, 25. März 2009, 11:30–11:45, SCH A118
Molecules with "wheels" on a metal surface — •Carlos Villagomez1, Takashi Sasaki2, James M. Tour2, and Leonhard Grill1 — 1Institut für Experimentalphysik, Freie Universität Berlin, 14195 Berlin — 2Chemistry Department, Rice University, Houston Texas, USA
The design and creation of molecular nanostructures with specific mechanical functions is one of the fundamental issues in nanotechnology. In this context, wheels are an interesting component for the molecular motion, because they are expected to alter the diffusion properties on surfaces, for instance by allowing only directed motion. In the presented work, we show the absorption of functional molecules studied by scanning tunneling microscopy under ultrahigh vacuum at low temperatures of about 7 K. The molecules consist of a phenyl chain, equipped with carborane side groups that represent the molecular "wheels". Additionally, bromine atoms are attached to the terminal groups of the molecules, which should allow the covalent connection of individual molecules, according to our recently presented "on-surface-synthesis" method. The high mobility of the molecules during deposition, at room temperature, enables them to form molecular nanostructures. Characteristic appearances of the molecules, due to different molecular configurations, are found. Furthermore, lateral manipulation was used to displace molecules and to probe their intermolecular interactions.