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O: Fachverband Oberflächenphysik
O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks
O 64.6: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, TRE Phy
Porous 2D networks formed by cyano-functionalized tetraphenyl porphyrins on Cu(111) — •Rajan Adhikari1, Gretel Siglreithmaier1, Jan Kuliga1, Michael Lepper1, Manuel Meusel1, Helen Hölzel2, Norbert Jux2, Bernd Meyer3, 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, Nikolaus-Fiebiger-Str. 10 , 91058 Erlangen, Germany — 3Computer-Chemistry-Center (CCC), Universität Erlangen-Nürnberg, Nägelsbachstr. 25, 91052, Erlangen, Germany
We investigated the adsorption of three related cyano-functionalized tetraphenyl porphyrin derivatives on Cu(111) by scanning tunneling microscopy in ultra-high vacuum with the goal to identify the role of the cyano group and the central Cu atom. The porphyrin derivatives studied were Cu-TCNPP, Cu-cisDCNPP, and 2H-cisDCNPP. Starting from different structures obtained after deposition at room temperature, all three molecules form the same long-range ordered hexagonal honeycomb-type structure with triangular pores, and three molecules per unit cell. For the metal-free 2H-cisDCNPP, this goes along with self-metalation. The structure-forming elements are pores with a distance of 3.1 nm, formed by triangles of porphyrins fused together by CN-Cu-NC interactions, with Cu adatoms. This finding leads us to suggest that the twofold cyano-functionalized at ''cis'' conformation is the minimum prerequisite to form a highly ordered 2D porous pattern.