Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.7: Vortrag
Mittwoch, 7. September 2022, 12:00–12:15, S051
STM growth studies of 5,14-ol-5,14-diborapentacyclo on low-index coinage metal surfaces — Wun-Chang Pan1, Jing Qi1, Carina Mützel2, Paula Weber1, Frank Würthner2, and •Matthias Bode1 — 1Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Institut für Organische Chemie & Center for Nanosystems Chemistry (CNC), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
In recent studies [1, 2], heteroatoms-doped precursors have frequently been used to polymerize graphene nanoribbons with a large variety of structures or dopant heteroatoms. Using cryogenic scanning tunneling microscopy, we investigated the structure of self-assembled 5,14-ol-5,14-diborapentacyclo (CM218) on low-index coinage metal surfaces. The main focus of our study is on CM218 on Ag(111), where we find that molecular clusters and chains coexist with molecular islands. At low annealing temperature Tann < 100∘C, the islands exhibit a rail track-like structure with a rhomboid-shaped unit cell. Besides, we find irregular clusters and molecular chains. At higher Tann ≥ 180∘C, islands with a honeycomb (HC) structure are observed. Topographic images of these HCs display a pronounced bias dependence. Molecule-functionalized tips allow for high-resolution images of these structures for which we suggest structural models.
[1] L. Grill and S. Hecht, Nature Chemistry 12, 115 (2020).
[2] Q. Zhong et al., Nature Chemistry 13, 1133 (2021).