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O: Fachverband Oberflächenphysik

O 88: Metal substrates: Adsorption of organic / bio molecules IX

O 88.1: Vortrag

Donnerstag, 17. März 2011, 17:15–17:30, PHY C213

2D Nanoporous networks based on simultaneous expression of H-Bonds and Metal-Coordination — •Sushobhan Joshi¹, Saranyan Vijayaraghavan¹, David Ecija¹, Willi Auwärter¹, Knud Seufert¹, Claudia Aurisicchio², Davide Bonifazi², and Johannes V. Barth¹ — ¹Physik Department, E20 Technische Universität München,D-85748 Garching, Germany — ²Department of chemistry, University of Namur,Namur B-500,Belgium

The control and understanding of self assembly protocols is a prerequisite to realize tailored stable molecular networks with novel functional properties. In particular, well defined metal surfaces have been employed as platforms to build highly regular 2D coordination networks, including porous patters suitable for hosting guest species. Here we present an STM study of supramolecular architechtures based on a de novo synthesised three fold symmetric molecule with 3 identical functional terminal pyridyl groups. they re instrumental for the development of porous networks stabilized by N..H hydrogen bonds and pyridyl Cu coordinations on Ag(111) and Cu(111) in UHV conditions. On Ag(111) a close packed layer is seen and subsequent Cu deposition essays three different coordinaiton strucutres. Two of the structures are based on both N...H Hydrogen bonds and Cu coordination and one is exclusively stabilized by Cu coordination. A glassy porous network was seen on Cu(111) substrate where the network topology is based again on both H-bonding and the linear pyridyl-Cu-pyridyl motifs.