Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 14: Organic/bio Molecules on Metal Surfaces II
O 14.12: Talk
Monday, March 31, 2014, 18:45–19:00, TRE Phy
Self-assembly of de-novo synthesized functionalized pyrenes on coinage metal surfaces — •Tobias Kaposi1, Sushobhan Joshi1, Tobias Hoh1, Alissa Wiengarten1, Tomas Marangoni2, Davide Bonifazi2,3, Knud Seufert1, David Écija Fernández1, Willi Auwärter1, and Johannes V. Barth1 — 1Physik Department E20, Technische Universität München, Garching, Germany — 2Dipartimento di Scienze Chimiche e Farmaceutiche and UdR INSTM, Università di Trieste, Trieste, Italy — 3Department of Chemistry and Namur Research College, University of Namur, Namur, Belgium
Supramolecular architectures on metallic surfaces provide multiple prospects for the engineering of novel nanostructured materials. Of particular interest are building blocks with inherent functional properties, such as single molecule magnets or photoactive groups.
Here we report a scanning tunneling microscopy study on the self-assembly of a family of pyridil- and phenyl-functionalized pyrenes, including an optically active backbone molecule already used in commercial dyes, on Ag(111) and Cu(111). By systematically changing the molecular functionalization and symmetry, different supramolecular synthons are expressed. Phenyl-substituents result in a uniform pyrene distribution on the surface, whereas pyridil-terminations drive the formation of different regular 2D networks, that may surprisingly include metal-organic binding motifs engaging Ag adatoms. The electronic features of these systems were probed by scanning tunneling spectroscopy.