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O: Fachverband Oberflächenphysik
O 7: Focus Session: Functional Molecules at Surfaces I
O 7.8: Vortrag
Montag, 16. März 2020, 12:30–12:45, TRE Ma
Dynamic adaptation of linear bis-hydroxamic acid modules in complex nanostructures — •Anthoula C. Papageorgiou1, Chao Jing1, Bodong Zhang1, Sabine Synkule1, Maryam Ebrahimi1, Alexander Riss1, Willi Auwärter1, Li Jiang1, Guillaume Médard2, Joachim Reichert1, and Johannes V. Barth1 — 1Physics Department E20, Technical University of Munich, Germany — 2Chair of Proteomics and Bioanalytics, Technical University of Munich, Germany
Recently, we functionalised linear building blocks with two terminal hydroxamic acid groups and applied them to two-dimensional (2D) architectonics on the close-packed single crystal surfaces of silver and gold.1 A combination of scanning tunnelling microscopy, atomic force microscopy, X-ray photoelectron spectroscopy and density functional theory investigations found that the molecular building block would ever so slightly adapt its shape in the environment provided by the supporting surface and its neighbouring molecules. This affords an unusual manifold of surface supramolecular motifs: two to six molecules held together by intermolecular interactions. Only a handful of these motifs organised in 2D crystals, ranging from close-packed structures to polyporous networks. Dynamic, chiral supramolecules formed enantioselectively within some of the larger network pores, demonstrating chirality transfer from host to guest. Molecular coverage, as well as the chemical state of the hydroxamic acid functional group are correlated to the complex self-assembly scenario.
1) Angew. Chem., Int. Ed. 2019 DOI: 10.1002/anie.201912247.