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O: Fachverband Oberflächenphysik
O 47: Poster Session IV: Organic molecules on inorganic substrates: networks and overlayers
O 47.3: Poster
Tuesday, March 2, 2021, 13:30–15:30, P
Self-assembled 2D-coordination-Kagome, quadratic and closed-packed-hexagonal lattices formed from cyano-functionalized benzo-porphyrins on Cu(111) — •Rajan Adhikari1, Jan Kuliga1, Michael Ruppel2, Norbert Jux2, Hubertus Marbach1, and Hans-Peter Steinrück1 — 1Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany — 2Lehrstuhl für Organische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
We investigated the adsorption of 2H-TCNPTBP molecules on the Cu(111) surface by scanning tunneling microscopy in UHV at RT. Three types of network structures are observed to coexist at low coverages. The first two Kagome lattice and the quadratic pattern are stabilized by cyano-Cu-cyano interactions with Cu adatoms; the other is a close-packed hexagonal network, which is stabilized by H-bonds and dipole-dipole interactions of oppositely oriented cyano-end groups. The hexagonal network has a molecular density on the surface, which is a factor of 2.3 larger than that of the Kagome lattice and the quadratic structure, which is attributed to the energy gain upon adsorbing a higher number of molecules. This finding leads us to suggest a coverage dependent competition between strong metal-organic coordination bonds at low coverage and weak hydrogen bonds plus dipole-dipole interactions at high coverage. The results show that a subtle interplay between adsorbate-substrate and adsorbate-adsorbate interactions can steer on-surface metal-organic coordination.