Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.74: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Accomodation of molecular guests in adaptive 2D nanoporous metal-organic networks — •David Ecija¹, Saranyan Vijayaraghavan¹, Willi Auwärter¹, Sushobhan Joshi¹, Knud Seufert¹, Claudia Aurisicchio², Davide Bonifazi², Kentaro Tashiro³, and Johannes V. Barth¹ — ¹Physik Department E20, Technische Universität München, D-85748 Garching, Germany — ²Department of Chemistry, University of Namur, B-5000 Namur, Belgium — ³National Institute for Materials Science, Tsukuba 305-0044, Japan

Flexibility in host frameworks is a key issue regarding their molecular recognition capabilities. The impact of guest species on the host structure ranges from conformational variation to pronounced structural changes. Here we report the usage of a glassy supramolecular porous network on Cu(111) to spatially organize and control CO and Ce(TPP)2 guest molecules, the latter representing molecular rotors. For the assembly of the host lattice a de novo synthesized molecule with three-fold symmetry was employed, featuring three terminal pyridyl groups. By STM experiments we show the flexibility of the realized open network where a local variation of the pore shapes can be induced. In order to assess the host-guest adaptability, we dose molecular species of different size. We study the selective accommodation of the guests in pores of different shape and geometry. Whereas the host network behaves as a rigid entity in the uptake and removal of CO, preliminary results signal that the dosing of Ce(TPP)2 species entails an adaptive response of the porous network towards the guest species.