Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Metal substrates: Adsorption of organic / bio molecules VII
O 65.6: Vortrag
Donnerstag, 17. März 2011, 12:30–12:45, PHY C213
Transfer of chirality from individual helicene derivatives into 2D supramolecular structures on Cu(111) — •Meike Stöhr1, Serpil Boz2, Michael Schär3, Francois Diederich3, Manh-Thuong Nguyen4, Daniele Passerone4, and Thomas Jung5 — 1University of Groningen, Netherlands — 2University of Basel, Switzerland — 3ETH Zürich, Switzerland — 4EMPA, Switzerland — 5Paul-Scherrer-Institute, Switzerland
The investigation of chiral phenomena in two dimensions has increased over the last two decades substantially. Both chiral recognition and transfer of chirality are two aspects amongst others which spurred fundamental research in this area. With STM, insight into the processes on the (sub)molecular scale can be gained. In addition, information on intermolecular and molecule substrate interactions, which govern the 2D assembly structure and thus, also determine how chiral recognition and transfer of chirality are expressed, are obtained. We investigated the adsorption of a helicene derivative featuring two cyano groups which are in opposition to each other on Cu(111) with UHV-STM. Through the functional cyano groups, the guided arrangement in 2D supramolecular structures is enabled. For the adsorption of both the racemic mixture and the enantiopure forms, a transfer of chirality into well-ordered structures is observed. The adsorption of one enantiomer results in structures which are mirror images of those obtained after deposition of the opposite enantiomer. By combining STM experiments with DFT calculations, the intermolecular interactions stabilizing the observed self-organized structures were elucidated.