Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Organic/bio Molecules on Metal Surfaces V
O 52.5: Vortrag
Mittwoch, 13. März 2013, 17:00–17:15, H38
From achiral molecules to chiral superstructures: triphenylamine derivatives on Au(111) — •Kathrin Müller1, Stefano Gottardi1, Juan Carlos Moreno-Lopéz2, Klaus Müllen3, Milan Kivala4, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Centro Atómico Bariloche-Instituto, Balseiro-CNEA-UNCuyo-CONICET, Río Negro, Argentina — 3Max Planck Institute for Polymer Research, Mainz, Germany — 4Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany
We investigated the self-assembly of achiral triphenylamine derivatives, so-called heterotriangulenes, which feature cyano functionalities intended for intermolecular dipolar coupling, on Au(111). We observed the coexistence of two phases, both expressing chirality. Deposition of one monolayer leads to the formation of a hexagonally closed packed phase. For submonolayer coverage numerous vacancies are present, which organize spontaneously forming a porous network. The second phase is stabilized by the introduction of metal-coordinated bonds and also exhibit pores. The structural models of the different binding motives of these two phases, the intermolecular interactions as well as the influence of the substrate on the assembly will be discussed. Moreover, we investigated the effect of post-annealing onto the assembly structure. We observed a partial transformation of one phase into the other. This spontaneous assembly of molecules into chiral and porous network structures on surfaces is of great interest for many future applications for example in catalysis, opto-electronics or as sensors.