Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: Organic Molecules on Inorganic Substrates VI: Chirality, Charge Transfer, Self-Assembly
O 83.2: Talk
Thursday, April 4, 2019, 15:15–15:30, H9
Two-dimensional racemate crystallization of trioxa-[11]helicene molecules on Ag(100) surface — •Bahaaeddin Irziqat1, Shyam Sundar2, Ashutosh Bedekar2, and Karl-Heinz Ernst1 — 1Empa, Dübendorf, Switzerland — 2University of Baroda, Vadodara, India
Intermolecular chiral recognition in two-dimensional self-assembly on metal surfaces is of paramount importance for enantiomeric separation and heterogeneous enantioselective catalysis for the production of chiral pharmaceuticals and liquid crystal devices. Two-dimensional nucleation and crystallization of a racemic mixture of the helical aromatic hydrocarbon trioxa-[11]helicene (7,12,17-trioxa[11]helicene) on the single crystalline (100) surface of silver has been studied using a combination of scanning tunneling microscopy and theoretical molecular modeling. After deposition on the surface kept at room temperature, the molecules form islands that are comprised of domains in line with the principal directions of the substrate. The domains are heterochiral, with alternating enantiomer sequence in one lattice direction and non-alternating enantiomer sequence in the other.