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O: Fachverband Oberflächenphysik
O 34: Nanostructures at Surfaces II
O 34.1: Talk
Tuesday, March 8, 2016, 10:30–10:45, H6
Hydrogen-bonded bimolecular network on Au(111) — •Christian Steiner1, Zechao Yang1, Ute Meinhardt2, Bettina Gliemann2, Martin Gurrath3, Bernd Meyer3, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, FAU Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Germany — 3Computer-Chemie-Centrum, FAU Erlangen-Nürnberg, Germany
Understanding and controlling the formation of multi-component molecular self-assemblies is important for the design of donor-acceptor networks which are an integral part of organic optoelectronic devices. We discuss the self-assembly and electronic properties of monomolecular[1] and bimolecular networks assembled from carboxyl- and diaminotriazinyl-functionalized triphenylamine derivatives based on low-temperature scanning tunneling microscopy experiments and density functional theory calculations. On Au(111), both molecules arrange in large porous hydrogen-bonded networks in order to optimize the intermolecular hydrogen bonding. Upon co-adsorption, the molecules form perfectly ordered bimolecular honeycomb networks stabilized by bonds between the carboxyl and the diaminotriazinyl groups. The HOMO-LUMO gap in the mixed network is defined by the two types of molecules, which is typical for an electron donor-acceptor scheme.
[1] C. Steiner et al. J. Phys. Chem. C, 119 (46), 25945-25955 (2015)