Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces

O 69.8: Poster

Wednesday, April 3, 2019, 17:45–20:00, Poster B2

Formation of Highly Ordered Porous 2D Networks from Cyano-Functionalized Porphyrins on Cu(111) — •Rajan Adhikari, Michael Lepper, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany

We investigated Cu-5, 10, 15, 20-tetrakis-(p-cyano)phenylporphyrin (CuTCNPP) on Cu(111) using Scanning Tunneling Microscopy in ultra-high vacuum at room temperature. While the adsorption behavior on Cu(111) in terms of intramolecular conformation and supramolecular arrangement of the free-base analogue 2HTCNPP and the corresponding porphyrin without cyano functionalization, i.e., CuTPP was previously reported, [1, 2] CuTCNPP behaves significantly different. It forms a peculiar hexagonal honeycomb-type pattern with triangular pores, initially coexisting with parallel arranged 1D molecular chains. Annealing to 400 K yields a complete transformation to the hexagonal honeycomb-type pattern. The hexagonal honeycomb pattern is formed by three Cu-TCNPP molecules linked by interstitial Cu-adatoms on the substrate. In summary, we report on a novel porous supramolecular structure, which might be well suited as a nanoscaled template. References: [1] M. Lepper, et al., Chem. Commun. 53 (2017) 8207 [2] K. Diller, et al., J. Chem. Phys. 136 (2012) 014705