Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 75: Organic/bio Molecules on Metal Surfaces VI
O 75.8: Talk
Thursday, March 14, 2013, 17:45–18:00, H38
2D lanthanide networks — •Jose I. Urgel1, David Ecija1, Anthoula C. Papageorgiou1, Saranyan Vijayaraghavan1, Sushobhan Joshi1, Willi Auwärter1, Svetlana Klyatskaya2, Mario Ruben2, Sybille Fischer1, Joachim Reichert1, and Johannes V. Barth1 — 1Physik Department E20, Technische Universität München, D-85748 Garching, Germany — 2Karlsruhe Institut für Technologie D-76344 Eggenstein-Leopoldshafen, Germany
Surface-confined metal organic architectures have been recently studied for alkali and transition metals in 2D. However, the field of lanthanide based networks on surfaces remains largely unexplored. Here we present, using scanning tunneling microscopy (STM), a distinct coordination of dicarbonitrile-oligophenyl linkers (p-NC-(Ph)n-CN-p (n=3,4)) to cerium centers on Ag (111), exhibiting a flexible five-fold nodal motif. By carefully tuning the concentration and the stoichiometric ratio of the rare-earth metal centers and molecular linkers, we realized a 2D hierarchic metal-organic assembly based on dodecameric units. For an increase in the cerium supply, a fully reticulated 2D metal-organic network evolves, whereby linkers are connected on both sides to Ce centers, following a design pattern identified as a molecular Archimedean snub square tessellation of the surface. Our study introduces the first implementation of the f-block elements in 2D metallosupramolecular assembly.