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O: Fachverband Oberflächenphysik
O 7: Surface Dynamics I
O 7.7: Talk
Monday, March 14, 2011, 12:45–13:00, WIL C107
Rotational and constitutional dynamics of caged supramolecules — •Florian Klappenberger1, Dirk Kühne1, Wolfgang Krenner1, Svetlana Klyatskaya2, Mario Ruben2, and Johannes V. Barth1 — 1Physik Department E20, TU München, Germany — 2Institute of Nanotechnology, Forschungszentrum Karlsruhe, Karlsruhe, Germany
The confinement of guest species in nanoscale environments leads to dynamic phenomena. Notably the organization and rotational motions of individual molecules were controlled by carefully designed, fully supramolecular host architectures. Here we use an open 2D coordination network on a smooth metal surface to steer the self-assembly of discrete trimeric guest units, identified as noncovalently bound dynamers. Each caged chiral supramolecule performs concerted, chirality-preserving rotary motions within the template honeycomb pore, which are visualized and quantitatively analyzed using temperature-controlled scanning tunneling microscopy. Furthermore, with higher thermal energies, a constitutional system dynamics appears, which is revealed by monitoring repetitive switching events of the confined supramolecules chirality signature, reflecting decay and reassembly of caged units.