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O: Fachverband Oberflächenphysik
O 65: Metal substrates: Adsorption of organic / bio molecules VII
O 65.7: Talk
Thursday, March 17, 2011, 12:45–13:00, PHY C213
Precursors for sergeant-and-soldiers experiments: dimethyl succinic acid on Cu(110) — •Chrysanthi Karageorgaki, Christian Roth, Manfred Parschau, and Karl-Heinz Ernst — EMPA, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
In order to better understand chiral recognition at the molecular level, we are currently studying interactions between different chiral butanedioc acids, like tartaric acid (TA), malic acid (MA) and 2,3-dimethyl succinic acid (DMSU) as well as achiral analogues like succinic acid (SU), meso-TA and meso-DMSU on metal surfaces. This led to first a observation of chiral amplification 2D crystals via the so-called "sergeant-and soldiers effect" [1]. In order to discriminate if through-substrate or lateral hydrogen bonding dominates the chiral recognition at surfaces, we currently synthesize chiral DMSU, i.e., replacing the hydroxyl groups of TA by methyl. Here we present LEED, XPS, TPD and RAIRS results of achiral meso-DMSU (HOOC-CH(CH3)-CH(CH3)-COOH) on Cu(110). Besides coverage-dependent "surface-explosion" decomposition chemistry and ordered C2-symmetric structures, DMSU spontaneously undergoes symmetry breaking, observed as superposition of mirror domains in LEED, which makes this system indeed interesting for doping experiments with chiral DMSU.
[1] M. Parschau, S. Romer, K.-H. Ernst, J. Am. Chem. Soc. 2004, 126, 15398.