SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Organic Molecules on Inorganic Substrates IV: Adsorption and Growth II

O 55.10: Vortrag

Mittwoch, 29. März 2023, 17:30–17:45, CHE 91

Controlled Formation of Porous 2D Lattices from C₃ Symmetric Ph₆-Me-Tribenzotriquinacene-OAc₃ — •Markus Leisegang¹, Sinem Toksabay¹, Andreas Christ¹, Patrick Härtl¹, Johannes Krebs¹, Todd B. Marder¹, Soumyajyoti Haldar², Stefan Heinze², Matthias Bode¹, and Anke Krueger^1,3 — ¹Universität Würzburg, Germany — ²Universität Kiel, Germany — ³Universität Stuttgart, Germany

The on-surface self-assembly of molecules is a promising approach to control the properties of resulting 2D lattices. Usually, planar molecules are utilized to prepare flat, structurally confined molecular layers, with only a few recent examples of warped precursors [1,2]. However, detailed control of the superstructures is limited thus far. Herein, we report the temperature-controlled self-assembly of a bowl-shaped, acetylated C₃-symmetric hexaphenyltribenzotriquinacene derivative on Cu(111). Combining scanning tunneling microscopy (STM) and density functional theory (DFT) confirms the formation of highly differing arrangements starting with π-stacked bowl-to-bowl dimers at low coverage at room temperature via chiral honeycomb structures, an intermediate trigonal superstructure, followed by a fully carbon-based, flattened hexagonal superstructure formed by on-surface deacetylation, which is proposed as a precursor for holey graphene networks with unique defect structures [3].
[1] T. Lohr et al., J. Am. Chem. Soc. 142, 13565 (2020)
[2] J. Urgel et al., J. Am. Chem. Soc. 141, 13158 (2019)
[3] S. Toksabay et al., Chem. Eur. J. 2022, e202203187 (2022)