Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Inorganic/Organic Interfaces: Growth II

O 12.12: Vortrag

Montag, 16. März 2015, 17:45–18:00, MA 005

Engineering of large-pore metal coordination networks from de-novo synthesized porphyrins — •Yuanqin He¹, Felix Bischoff¹, Knud Seufert¹, Willi Auwärter¹, Daphne Stassen², Davide Bonifazi², and Johannes Barth¹ — ¹Physik Department E20, Technische Universität München, James Frank Str. 1, D-85748 Garching, Germany — ²Department of Chemistry and Namur Research College, University of Namur, Belgium

Molecular self-assembly using designed building blocks is a versatile method to fabricate nanostructures with tunable properties, wherein intermolecular interaction is a key factor that determines the structure. Here we present a low-temperature STM study on the self-assemblies of two differently substituted porphyrin species on Ag(111), namely (5,10,15,20)tetra-biphenylcyano porphyrin (2H-TPCN) and (5,10,15,20)tetra-pyridylphenylporphyrin (2H-TPyPP). Their distinct terminal substituents and the coordination to metal atoms, when adding Cu adatoms, induce different organic and metal-organic patterns. This allows us to explore the influence of the intermolecular interactions on the self-assembly and the formation of metal-organic coordination networks. Furthermore Monte-Carlo simulations are performed for these two systems, perfectly reproducing all the patterns observed in the experiment. The experimental results in combination with the phase transition diagram derived from the simulation can give us a hint on the ratio between the coordination bond and vdW force, which can be further used to design molecular building blocks and self-assembly protocols.