Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.35: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Intermolecular vs. molecule-substrate interactions - a STM study — •Michael Roos1, Daniela Künzel2, Harry E. Hoster1,3, Axel Groß2, and R. Jürgen Behm1 — 1Ulm University, Institute of Surface Chemistry and Catalysis, 89069 Ulm, Germany — 2Ulm University, Institute of Theoretical Chemistry, 89069 Ulm, Germany — 3Current address: Technische Universität München, Centre for Electromobility, 50 Nanyang Drive, Singapore 637553
The formation of 2D molecular networks is governed by a competition between intermolecular interactions and the lateral variation in molecule-substrate interactions. In this contribution we study the effect of varying the location of the heteroatoms (N atoms) in planar organic adsorbates by using two Bis(terpyridine) derivatives (BTP) as model systems. On smooth surfaces the resulting structures are dominated by weak C-H⋯N-type hydrogen bonds. We will compare the ordering behavior with the network formation on graphene monolayers supported by Ru(0001). The moiré pattern of these surfaces has a periodicity of 3 nm, i.e., in the order of the BTP dimensions. Submolecularly resolved STM images show that the BTP molecules are confined to the valleys of the graphene ripple structure. We will discuss the template effect quantitatively by means of force field calculations and supporting thermal desorption experiments.