Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Poster: Nanostructures on Surfaces I
O 49.10: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Formation of Metal-Organic Coordination Networks on a Bulk Insulator Surface — •Lukas Schüller1, Md Taibur Rahman1, Ralf Bechstein1, and Angelika Kühnle2 — 1Institute of Physical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany — 2Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany
Metal-organic coordination networks (MOCNs) are a class of two-dimensional compounds with potentially interesting electronic, magnetic and catalytic properties. A variety of MOCNs have been created on metal surfaces. However, an underlying insulator surface is beneficial for the electronic decoupling of structure and surface. To this end, we demonstrate the self-assembly of organic linker molecules and the formation of MOCN precursor structures in the presence of iron nano-clusters at room temperature. Our study of biphenyl-4,4'-dicarboxylic acid (BPDCA) in presence of iron on calcite (10.4) unravels two important findings: First, the deposition order plays a vital role in the formation of MOCNs. Second, a strong templating effect of the underlying surface is decisive for the direction, in which the MOCN is more extended. Currently, we vary the size of the linker molecule in order to match the surface unit cell size. Terephtalic acid (TPA), a homologue of BPDCA with one phenyl ring less, is examined in presence of iron, as well as 1,1':4',1''-terphenyl-4,4''-dicarboxylic acid (TPDCA), i.e., the homologue of BPDCA with one phenyl ring more. With this work, we explore the formation of an extended MOCN on an application-relevant bulk insulator surface.