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O: Fachverband Oberflächenphysik
O 19: Poster Session II: Organic molecules on inorganic substrates: Adsorption and growth II
O 19.3: Poster
Montag, 1. März 2021, 13:30–15:30, P
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 — 2The School of Chemistry, Cardiff University, UK-CF10 3AT Cardiff, United Kingdom — 3Institute of Organic Chemistry, Faculty of Chemistry, University of Vienna, Austria
In recent years, the on-surface formation of hybrid structures combining porphyrins and graphene nanoribbons (GNRs) attracted increasing interest due to their potential for electronic, optoelectronic and spintronic applications [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) with CO functionalized tips. Porphyrin-GNR hybrid chains with lengths exceeding 20 nm are achieved. Our experiments reveal atomistic details of different coexisting coupling motifs and give first insights into the electronic structure of this porphyrin-GNR system.
[1] J. Li et al., Sci. Adv. 4, eaaq0582 (2018)
[2] L.M. Mateo et al., Chem. Sci. (2021)
[3] F. Bischoff et al., Angew. Chem. Int. Ed., 57, 16030 (2018)