Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.8: Poster
Tuesday, April 1, 2014, 18:30–22:00, P1
Large pores and multiple active sites: a 2D metal-organic network employing a de-novo synthesized porphyrin linker — •Yuanqin He1, Felix Bischoff1, Knud Seufert1, Willi Auwärter1, Daphné Stassen2, Davide Bonifazi2, and Johannes Barth1 — 1Technische Universität München, Department of Physics, E20, Garching, Germany — 2University of Namur, Department of Chemistry, Namur, Belgium
Exploring principles for future single-molecule devices and developing new materials for catalysis using functional molecular building blocks are motivations for molecular nanoscience. Herein, the bottom-up fabrication of metal-organic networks is a promising approach, notably regarding temperature stability or controllable and tunable assembly protocols. We present a low-temperature scanning tunneling microscopy study of the de-novo synthesized porphyrin linker (5,10,15,20)tetra[4-(4-pyridyl)phenyl]porphyrin on Ag(111). This free-base tetrapyrrole species forms nanoporous, metal-organic networks via N-Cu-N coordination bonds when adding Cu atoms. Networks with large openings stabilized by directional coordination interactions present metal atoms as possible catalytically active sites, porphyrin macrocycles as "chemical pockets" and open pores for host-guest chemistry.