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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 Krueger1,3 — 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)