Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering

O 77.7: Talk

Thursday, April 4, 2019, 12:00–12:15, H9

Metalation and coordination reactions of 2H-meso-trans-di(p-cyanophenyl)porphyrin on Ag(111) with coadsorbed cobalt atoms — •Jan Kuliga, Liang Zhang, Michael Lepper, Hans-Peter Steinrück, and Hubertus Marbach — Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen

The controlled fabrication of functional molecular nanoarchitectures on surfaces is in the focus of our research activities. Thereby, we follow a bottom-up approach in which we rely on the adsorption behavior, i.e., self-assembly and in situ reactions of porphyrin derivatives as prototype functional molecules. In this context, we investigated the metalation and coordination reactions of Co with 5,15-bis(para-cyanophenyl)-10,20-bisphenylporphyrin (2HtransDCNPP) on a Ag(111) surface by scanning tunneling microscopy. At room temperature, 2HtransDCNPPs self-assemble into a well-ordered supramolecular structure stabilized by van der Waals interactions and intermolecular hydrogen bonding. The metalation to CotransDCNPP can be realized by pre- or postdeposition of Co atoms onto the Ag(111) surface. Interestingly, with *excess* Co material we observe the formation of peculiar structures appearing as 3 to 7 protrusion motifs in STM, with the dominating motif the 5-protrusion appearance.[1] The motifs could be identified through bias-dependent STM as 2 to 6 CotransDCNPPs coordinated by central Co atoms through peripheral cyano groups.

[1] Kuliga, et al., PCCP 20 (2018) 25062