Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 89: Metal substrates: Adsorption of organic / bio molecules V
O 89.5: Vortrag
Freitag, 30. März 2012, 11:30–11:45, A 053
H-bonding as a tool for engineering 1D and 2D supramolecular structures on surfaces — •Mihaela Enache1, Manfred Matena2, Laura Maggini3, Anna Llanes-Pallas3, Davide Bonifazi3, Thomas Jung2, and Meike Stöhr1 — 1University of Groningen, Netherlands — 2University of Basel, Switzerland — 3University of Namur, Belgium
By utilizing the concepts of supramolecular chemistry, remarkable results for molecular self-assembly on surfaces have been presented. The outcome of the self-assembly process is known to be affected by the fine tuning of different parameters (such as thermal energy, ratio between different molecular units, etc.) which have a direct influence on the interplay between intermolecular and molecule-substrate interactions.
Herein, we present a scanning tunneling microscopy study demonstrating that - by choosing the recognition moieties appropriately - H-bond recognition between specially designed molecules can predictably lead to the formation of 1D and 2D structures.
Upon adsorption on Ag(111), two different molecular modules self-assemble through triple H-bonding between their complementary recognition moieties forming supramolecular architectures. Depending on the sample preparation parameters, either chain-like or porous structures can be obtained. Therefore, a well-known concept from supramolecular chemistry can be transferred for the fabrication of surface-mounted organic assemblies.
[1] Llanes Pallas et al., Angew. Chem. Int. Ed. 47 (2008) 7726
[2] Matena et al., Chem. Commun. (2009) 3525