Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Poster Monday: Nanostructures 1

O 23.8: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Construction of a regular tessellation via bromine bond on a Ag(100) surface — •Wenchao Zhao, Nan Cao, Biao Yang, and Johannes V Barth — Physics Department E20, Technical University of Munich, D-85748 Garching, (Germany)

Engineering 2D surface tessellations at the molecular level attracted major interest with the development of nanoscience and technology. To this end supramolecular self-assembly exploiting tailored molecular species and programmed intermolecular interaction are widely employed. Halogen bonds are promising for potential application due to the σ-hole anisotropic charge distribution of halogen atoms1,2,3. Herein, we address the behavior of ditopic bromine-terminated linear monomers on a Ag(100) surface at the molecular level, affording a tessellation guided by the surface symmetry. In the temperature range of 120 to 200 K, the building blocks form a porous nested grid structure stabilized by bromine bonds and molecule-substrate interactions. Two kinds of quad nodes are distinguished therein, involving a complex non-covalent bonding scheme. Interestingly, both nodes feature supramolecular chirality, entailing domains with both rectangular and trapezoid cavities. Our work introduces a new and complex surface tessellation scheme based on halogenated hydrocarbons on metal surfaces. References 1. G. Cavallo et al., Chem. Rev. 116, 2478-2601 (2016). 2. Z. Han et al., Science 358, 206-210 (2017) 3. Mallada et al., Science 374, 863-867 (2021)