Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Organic/bio Molecules on Metal Surfaces V
O 52.6: Vortrag
Mittwoch, 13. März 2013, 17:15–17:30, H38
On-surface polymerization of biphenyl derivatives on Ag(111) — •Fei Song1, Tuan Anh Pham1, Serpil Boz2, Umut Soydaner3, Marcel Mayor3, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, 9747AG, the Netherlands — 2Department of Physics, University of Basel, Switzerland — 3Department of Chemistry, University of Basel, Switzerland
The controlled assembly of molecular building blocks, which possess functional units for switching, subsequent covalent interlinking etc., into functional architectures on surfaces has become an established research fields over the past decades [1]. However, the structures which are based on non-covalent interactions mostly lack mechanical stability. In view of possible future applications higher stability and the prospect of improved charge transport are important requirements. In this work, a unique concept to control both the molecular self-assembly and the subsequent intermolecular coupling was utilized through equipping the molecular building blocks with terminal protecting groups. Specifically, biphenyl derivatives with BOC protecting groups were deposited onto a Ag(111) surface. STM and XPS were used to explore both the self-assembly behaviors and the on-surface polymerization after annealing the sample at elevated temperatures. It turned out that the protecting groups can be split off by annealing [2] and the deprotected monomers interlink into polymeric structures. By tuning the design of the organic monomers, the reactivity as well as the size of polymeric structures can be controlled. Reference [1] J.A.A.W. Elemans, Angew. Chem. Int. Ed. 48 (2009) 7298 [2] S. Boz et al., Angew. Chem. Int. Ed. 48 (2009) 3179