Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 64: Organic Molecules on Inorganic Substrates IV: Adsorption, Growth and Networks
O 64.10: Talk
Wednesday, March 18, 2020, 13:00–13:15, TRE Phy
On-surface Synthesis of Porphyrin-GNR Hybrid Chains — •Joel Deyerling1, Mathias Pörtner1, Luka Dordević2, Alexander Riss1, Davide Bonifazi3, and Willi Auwärter1 — 1Physics Department E20, Technical University of Munich, Germany — 2Department of Chemical and Pharmaceutical Sciences, University of Trieste, Italy — 3School of Chemistry, Cardiff University, U.K.
In recent years, the on-surface formation of hybrid structures combining porphyrins and graphene nanoribbons (GNRs) attracted increasing interest [1-3]. A control on the precise atomic structure of such covalently linked porphyrin-based heterosystems is highly relevant for the tuning of their electronic and functional properties.
Here, we address dehalogenative coupling reactions of a bromo-naphthalene functionalized Zn-porphyrin derivative on Ag(111) and Au(111). This precursor, its reaction steps, and different coupling motifs are characterized by scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM) using a CO functionalized tip. Porphyrin-GNR hybrid chains exceeding a length of 20 nm are achieved. Our experiments reveal atomistic details of different coexisting coupling motifs, which holds great promise for future investigations of the corresponding electronic structure.
[1] J. Li et al., Sci. Adv. 4, eaaq0582 (2018)
[2] L.M. Mateo et al., Angew. Chem. Int. Ed., (2019)
[3] F. Bischoff et al., Angew. Chem. Int. Ed., 57, 16030 (2018)