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O: Fachverband Oberflächenphysik
O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks
O 64.2: Vortrag
Mittwoch, 18. März 2020, 10:45–11:00, TRE Phy
Conformation controls mobility: 2H-Tetranaphthylporphyrins on Cu(111) — •Jan Kuliga1, Stephen Masicot1, Rajan Adhikari1, Michael Ruppel2, Norbert Jux2, Hans-Peter Steinrück1, and Hubertus Marbach1 — 1Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany — 2Lehrstuhl für Organische Chemie II, Universität Erlangen-Nürnberg, Henkestr. 42, 91054 Erlangen, Germany
The adsorption behavior and the mobility of 2H-Tetranaphtylporphyrin (2HTNP) on Cu(111) was investigated by scanning tunneling microscopy (STM) at room temperature (RT). The molecules adsorb in the *inverted* structure, like the structurally related 2HTPP, with the naphthyl plane restricted to an orientation parallel to the Cu surface. The orientation of the four naphthyl groups yields altogether 16 possible conformations. Due to the existence of rotamer pairs, 10 different appearances are expected on the surface, which could all be identified by STM at RT. Most interestingly, the orientation of the naphthyl groups significantly influences the diffusion behavior of the molecules on Cu(111). We could identify three different groups of conformers, which are either immobile, medium or fast diffusing at RT. The mobility seem to decrease with increasing size of the footprint of the conformers on the surface.