Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 51: Metal Substrates: Adsorption of Organic/Bio Molecules III
O 51.3: Talk
Wednesday, February 27, 2008, 15:45–16:00, MA 041
Formation of covalently bound chains from Dibromoterfluorene molecules on Au(111) — •Leif Lafferentz1, Hao Yu2, Stefan Hecht2, and Leonhard Grill1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin
Supramolecular structures formed by self-assembly on surfaces have attracted a lot of interest in the last years. While the formation of arrays relying on non-covalent bonds can yield structures of high complexity, they tend to be not very robust. For nanostructures of potential interest for future applications, a more rigid connection of the molecular building blocks is required.
Recently, it has been shown in our group that it is possible to form molecular networks of predesigned architecture by directed covalent linking of porphyrin molecules [1]. We will present results on the versatility of this method using differently designed building blocks, namely Dibromoterfluorene (DBTF). Intact molecules are found on the Au(111) surface in characteristic arrays. Upon sufficient heating, these molecules become "activated" and are connected by covalent bonds to form long chains. The constructed macromolecules are characterized by scanning tunneling microscopy (STM). Furthermore, manipulation of the molecular chains by using the STM tip will be presented. [1] L. Grill, M. Dyer, L. Lafferentz, M. Persson, M. V. Peters, and S. Hecht, Nature Nanotech. 2, 687 (2007)