SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 47: Poster Session IV: Organic molecules on inorganic substrates: networks and overlayers
O 47.5: Poster
Dienstag, 2. März 2021, 13:30–15:30, P
On-surface assembly of supramolecular graphyne-like 2D materials: from hydrogen- and halogen-bonded to organo-metallic networks — Zechao Yang1, Lukas Fromm2, Tim Sander1, Julian Gebhardt2, Tobias Schaub3, Himadri Soni2, Binbin Da1, Andreas Görling2, Milan Kivala3, and •Sabine Maier1 — 1Department of Physics, FAU Erlangen-Nürnberg — 2Chair of Theoretical Chemistry, FAU Erlangen-Nürnberg — 3Organisch-Chemisches Institut, Universität Heidelberg
The on-surface assembly of graphyne-based 2D materials are directive for the synthesis of the elusive carbon allotrope graphyne. Here, we demonstrate a supramolecular approach to fabricate highly-ordered monolayered hydrogen- and halogen-bonded [1] as well as organometallic graphyne-like 2D materials [2] from functionalized triethynyltriazine derivatives on Au(111) and Ag(111). The supramolecular graphynes have been investigated by STM in combination with DFT. We found that the halogen-bondend networks with N…Br-C(sp)-bonds lead to significantly stronger bonded networks compared to the hydrogen-bonded networks with N…H-C(sp)-bonds. For the organometallic networks with Ag-bis-acetylide bonds, large-area networks of several hundred nanometers with topological defects at domain boundaries are obtained. The thermodynamically controlled growth mechanism is explained through the direct observation of intermediates, which differ on Ag(111) and Au(111).
[1] Z. Yang et al. Angew. Chem. Int. Ed., 59, 24, 9549-9555 (2020)
[2] Z. Yang et al. ACS Nano, 14, 12, 16887-16896 (2020)