Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Organic/bio Molecules on Metal Surfaces V

O 52.3: Vortrag

Mittwoch, 13. März 2013, 16:30–16:45, H38

Stereochemistry of C₄ dicarboxylic acids on Cu(110) — •Chrysanthi Karageorgaki¹ and Karl-Heinz Ernst^{1, 2} — ¹EMPA, Nanoscale Materials Science, Dübendorf, Switzerland — ²Chemistry department, University of Zürich, Zürich, Switzerland

In order to better understand self assembly at the molecular level, we are studying different chiral butanedioic acids, like tartaric acid (TA), malic acid (MA) and 2,3-dimethyl succinic acid (DMSU), as well as achiral analogues like succinic acid (SU), maleic acid (MEA), fumaric acid (FUA), meso-DMSU and trans 1,2-cyclohexane dicarboxylic acid (CHDCA) on Cu(110). Here we present LEED, STM and TPD results of the aforementioned compounds. Apart from coverage dependent "surface explosion" decomposition, all achiral compounds undergo chiral symmetry breaking, observed as superposition of mirror domains in LEED. Interestingly, the obtained LEED structures coincide for the various compounds, suggesting that the chiral recognition at surfaces derives from the substrate, in particular, when the molecule doesn’t have functional groups to form strong intermolecular bonds. STM reveals that the substrate is "etched", leading to chiral reconstructions of the surface.