Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.14: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B1

Ordered structures of the acceptor molecule TNAP on Au(111) investigated by STM and LEED — •Qinmin Guo, Benjamin Fiedler, Stefan Gärtner, and Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie der Universität Bonn

As a strong electron acceptor 11,11,12,12-tetracyanonaptho-2,6-quinodimethane (TNAP) is attractive for synthesising molecular charge transfer compounds. As a preparatory step we have studied the rich phase diagram of TNAP on the Au(111) surface for varying coverages and temperatures using STM and LEED. We have found at least 4 different structures (α, β, γ, δ) depending on the coverage and post-annealing conditions. α is a 1-dimensional ordered linear structure, and β is the brickwall-like structure reported also in ref. [1]. By post-annealing at 400 K, β can be converted into γ with a T-shaped arrangement of the molecules. The structure δ is only obtained at low temperatures. We will discuss these intermolecular interactions relevant for the structures. In addition, we present first results on binary structures of TNAP with electron donating molecules both on Au(111) and thin epitaxial KCl films on Au(111). This work is supported by SFB 813.