Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 99: Organic Molecules on Inorganic Substrates VI: Adsorption, Growth and Networks

O 99.5: Talk

Thursday, March 19, 2020, 11:45–12:00, GER 38

On-surface synthesis of triazine-based porous nanoribbons — •Mirunalini Devarajulu, Martin Haller, Min-Ken Li, Shadi Sorayya, and Sabine Maier — Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

Covalent triazine frameworks are 2D materials that provide a high chemical stability and plenty of nitrogen sites, which are important for host-guest chemistry and applications as membranes and energy storage materials. Here, we present a low-temperature scanning tunneling microscopy study on the on-surface synthesis of triazine-based porous carbon nanoribbons on Ag(111) using 1,3,5-tris(3-bromophenyl)triazine as a precursor. We followed a thermally induced sequential synthesis based on an Ullmann-type reaction to covalently couple the molecules and a preprogrammed isomerization combined with a dehydrogenation reaction to fabricate the ribbons, as previously reported for all-carbon porous nanoribbons.[1,2] Despite the structural similarity of the precursors, the triazine-based molecules lacked a strong conformational selectivity in the first reaction step, which prevented the ribbon formation. We demonstrate that this can be successfully resolved by following either a bimolecular or a kinetically controlled synthesis, respectively. Finally, we will show that the triazine-based porous nanoribbons are suitable for host-guest experiments using single metal atoms.

[1] M. Ammon, T. Sander, S. Maier, JACS, 2017, 139 (37), 12976.

[2] M. Ammon, et al., ChemPhysChem 2019, 20, 2333.