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Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Surface chemical reactions I

O 49.4: Talk

Wednesday, March 24, 2010, 11:15–11:30, H42

Switching Single Azopyridine Supramolecules in Ordered Array on Au(111) — •Yongfeng Wang1, Xin Ge1, Guillaume Schull1, Richard Berndt1, Hao Tang2, Claudia Bornholdt3, Felix Koehler3, and Rainer Herges31Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, D-24098 Kiel, Germany — 2CEMES/CNRS, France — 3Institut für Organische Chemie, Christian-Albrechts-Universität, D-24098 Kiel, Germany

Understanding and controlling molecular switches on surfaces is of interest in both fundamental science and functional device at the single molecule level. Single molecular switches have been realized by modifying covalent bonds or ionic bonds. Decoupling of the reactive component of the molecule from a metal substrate by an insulating layer can be necessary as reversible switching is usually quenched on metals for the rather high barrier to overcome and the short lifetime of excitations. In contrast to molecules, supramolecules are connected through weak noncovalent interactions like hydrogen bonding. Lower energy barriers to switching may be expected for these weaker bonds. Here we report on supramolecular switches of 4,4-azopyridine trimers and 4-phenylazopyridine dimers in ordered array on Au(111). During switching, a single weak C-H...N hydrogen bond breaks and reforms. For 4,4-azopyridine, the switching mechanism occurs via electron attachment. 4-phenylazopyridine dimer, however, can be switched by electric fields, too. Funding by the Deutsche Forschungsgemeinschaft through SFB 677 is acknowledged.

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