Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 89: Metal substrates: Adsorption of organic / bio molecules V
O 89.7: Talk
Friday, March 30, 2012, 12:00–12:15, A 053
Hierarchic Formation and Dynamics of Bi-component Supramolecular Networks — •W. Krenner1, F. Klappenberger1, N. Kepčija1, E. Arras1, Y. Makoudi1, D. Kühne1, S. Klyatskaya2, M. Ruben2,3, A. P. Seitsonen4, and J. V. Barth1 — 1Physikdepartment E20, TU München — 2Institute of Nanotechnology, Karlsruhe Institute of Technology — 3IPCMS-CNRS UMR 7504, Université de Strasbourg — 4Physikalisch-Chemisches Institut, Universität Zürich
In this work, the formation and dynamics of bi-component organic molecular networks providing open pores following hierarchic assembly principles are investigated via low- and variable temperature STM in UHV and DFT modeling. By co-depositing N,N’ diphenyl oxalic amide (DOA) and sexiphenyl dicarbonitrile (6DC) on Ag(111), self-assembled structures are encountered where organisation depends on the stoichiometric ratio of the constituents.
All network types reflect hierarchic architectures, where similar, essential molecular binding motifs prevail. The different energetics of the individual binding motifs are assessed by theoretical simulation, showing that hierarchic assembly is driven by the strength of the respective interactions. Thereby, the experimentally observed preference of DOA-6DC binding is rationalized, accounting for the formation of mixed phases over phase segregation.
The analysis of the dynamics in the network phase with high variation in binding energies shows good accordance for the diffusion behavior expected from DFT binding energy modeling.