Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 111: Nanostructures at Surfaces: Molecular Systems III
O 111.4: Vortrag
Freitag, 24. März 2017, 11:15–11:30, REC/PHY C213
On-surface synthesis and characterization of nonsymmetrical single-molecule nodes — •Christophe Nacci1, Andreas Viertel2, Stefan Hecht2, and Leonhard Grill1 — 1University of Graz, Graz, Austria — 2Humboldt-University, Berlin, Germany
On-surface reactions are a promising strategy for synthetizing complex molecular architectures that are potentially relevant in the field of novel nanostructures and molecular electronics. Suitable design of molecular building blocks is required to construct molecular nanostructures with a well-defined size, geometry and composition [1]. A molecular node, i.e. a junction where several molecular wires merge, represents a key component in monomolecular electronic circuits, but its growth requires a precise and well-defined arrangement of different building blocks. Here, we report the first construction of a chemically and geometrically well-defined covalent architecture made of one central node and three molecular wires arranged in a non-symmetrical fashion in order to ensure different conjugation pathways [2]. Slight modifications of the molecular building blocks results in significant change of the outcome of the chemical reactions involved in the on-surface synthesis process on the Au(111) surface. The electrical characterization of individual non-symmetric molecular nodes by pulling them off a supporting surface with the tip of a scanning tunneling microscope will be discussed [2]. [1] L. Grill et al., Nature Nanotechnology 2, 687 (2007) [2] C. Nacci et al., Angew. Chem. Int. Ed. 55, 13724 (2016)