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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 Marschall^1,2, Joachim Reichert^1,2, Alexander Weber-Bargioni², Knud Seufert¹, Willi Auwärter¹, Svetlana Klyatskaya³, Giorgio Zoppellaro³, Mario Ruben³, and Johannes V. Barth^1,2 — 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.