Regensburg 2007 – scientific programme
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O: Fachverband Oberflächenphysik
O 39: Nanostructures at Surfaces IV (Dots, Particles, Clusters, Arrays)
O 39.7: Talk
Wednesday, March 28, 2007, 17:15–17:30, H36
Creation of open networks from perylene derivatives — •Serpil Boz1, Manfred Matena1, Markus Wahl1, Thomas A. Jung2, Lutz H. Gade3, and Meike Stöhr1 — 1Institute of Physics, University of Basel, Switzerland — 2Paul-Scherrer-Institute, Switzerland — 3Institute of Inorganic Chemistry, University of Heidelberg, Germany
Self-assembly of molecules on surfaces directed by supramolecular interactions has been widely explored. The perylene derivative (DPDI) we analyzed [1] is modified on the surface in order to achieve self-assemblies. This modification is temperature-induced, thus providing an additional feature to the control of self-assemblies in contrast to usual approaches that make use of molecular properties already inherent to the molecules. Thin films of DPDI were prepared on Cu(111) and investigated with STM. Depending on the coverage before annealing, three different H-bond assemblies are generated, since in a thermally induced reaction the end groups of the molecule are modified and it can then act as both a H-bond donor and acceptor. For a similar perylene derivative (TAPP), an open quadratic assembly is found on Cu(111), which is not based on temperature-induced modification. If both molecules are present on the surface and the sample is annealed, a separation into two porous networks is observed.
[1] M. Stöhr et al., Angew. Chem. Int. Ed., 2005, 44, 7394