Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 114: Nanostructures at surfaces: 1D and 2D structures and networks IV
O 114.2: Vortrag
Freitag, 16. März 2018, 10:45–11:00, MA 141
Assembly of robust holmium-directed 2D metal-organic coordination complexes and networks on the Ag(100) surface and on epitaxial MgO/Ag(100) layers — •Martin Uphoff1, Raphael Hellwig1, Georg Michelitsch2, Karsten Reuter2, Harald Brune3, Florian Klappenberger1, and Johannes V. Barth1 — 1Physics Department, TUM, Munich, Germany — 2Faculty of Chemistry, TUM, Munich, Germany — 3Institute of Physics, EPFL, Lausanne, Switzerland
We report the fabrication of novel lanthanide-directed metal-organic coordination networks (MOCNs) and complexes under UHV conditions on a clean Ag(100) surface. Utilizing STM we investigate the assembly behavior of single holmium atoms as coordination centers and 1,4-benzenedicarboxylic acid (TPA) as molecular linkers. The step-wise fabrication of the structures, as well as an organic precursor phase is described in detail. We observe two different phases of holmium-based metal-organic architectures. MOCNs as well as Ho-directed metal organic complexes can be fabricated and structural models are developed and confirmed by DFT calculations. The contributions of metal-ligand interactions, hydrogen bondings between adsorbed molecules and the role of molecule substrate interaction is analyzed. Furthermore, the metal-organic layers could be realized on magnesium oxide on Ag(100) to screen them from electronic influences of the metal surface. MgO monolayers of unprecedented quality allow the fabrication of metal-organic structures, which are similar to those on the bare silver in terms of their binding motifs and stoichiometry.