Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Metal substrates: Adsorption of organic / bio molecules II
O 14.1: Vortrag
Montag, 22. März 2010, 15:00–15:15, H36
Random 2D metal-organic string networks based on divergent coordination assembly — •Matthias Marschall1,2, Joachim Reichert1,2, Alexander Weber-Bargioni2, Knud Seufert1, Willi Auwärter1, Svetlana Klyatskaya3, Giorgio Zoppellaro3, Mario Ruben3, and Johannes V. Barth1,2 — 1Physik Department E20, TU München, Germany — 2Department of Physics & Astronomy, University of British Columbia, Vancouver, Canada — 3Institut für Nanotechnologie, Karlsruhe Institute of Technology, Germany
The molecular-level investigation of random networks becomes possible with two-dimensional supramolecular systems assembled on well-defined surfaces. Such studies allow to identify elementary structural motifs or characteristic defects and thus provide new insights into the intriguing nature of glasses and amorphous solids. Here we report a direct scanning tunneling microscopy investigation of a random metal-organic network, comprising interconnected strings and multiple ramification motifs. We employed a nonlinear prochiral ditopic linker deconvoluted in three stereoisomers upon surface confinement. Metallosupramolecular assembly was induced by codeposited cobalt atoms engaging in lateral metal-ligand interactions with the linker dicarbonitrile endgroups. The resulting complex networks are based on a library of distinct three- and fourfold Co-carbonitrile nodal coordination motifs giving rise to bifurcation or string formation. Thus the linker symmetry deconvolution and coordination multiplicity entails divergent assembly with concomitant random reticulation of the entire surface.