Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.5: Vortrag
Donnerstag, 23. März 2017, 16:30–16:45, REC/PHY C213
Host-guest chemistry in carbonyl functionalized pores of covalent structures on Au(111) — •Yi Liu1, Christian Steiner1, Maximilian Ammon1, Natalie Hammer2, Julian Gebhardt3, Andreas Görling3, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, University of Erlangen-Nürnberg, Erlangen, Germany — 2Chair of Organic Chemistry I, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany — 3Chair of Theoretical Chemistry, Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Erlangen, Germany
Host-guest chemistry in nanoporous supramolecular networks physisorbed on solid surfaces is a rapidly expanding field owing to potential applications in separation technology, catalysis, and sensor devices. However, most structures rely on non-covalent interaction forces, which results in a lack of thermal stability and weak intermolecular transport.
We report on the host-guest interaction between atoms and molecules with carbonyl-functionalized pores in covalent networks. The covalent structures are obtained by on-surface synthesis of halogen-substituted carbonyl-bridged triphenylamines on Au(111). The templating effect of the pores was investigated by low-temperature scanning tunneling microscopy in combination with density-functional theory. We found that trimesic acid and halogen atoms can be trapped at specific sites in the pores through hydrogen bonds or van der Waals interaction, respectively. Interestingly, we observed that iodine-iodine interactions are preferred over iodine-carbonyl interactions.