Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.33: Poster
Tuesday, March 17, 2015, 18:15–21:00, Poster B
Structural and Electronic Properties of Thiophene-based Supramolecular Architectures on the Metal Surface — •Zechao Yang1,2, Katharina J. Franke1, and Jose I. Pascual1,3 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Department für Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany — 3CIC nanoGune, 20018 Donostia-San Sebastián, Spain
We investigated the structural and electronic properties of dicyanovinyl-hexathiophenes (DCV6T), a prototype molecule for organic electronics, on Au(111) by using low temperature STM and AFM. DCV6T self-assembles in organic islands and chains simultaneously, stabilized by hydrogen bonding. Interestingly, the molecule is deformed to an energetically unfavorable configuration by the intermolecular interaction upon self-assembly of chains, which can be interpreted by the *Induced Fit Theory*. Moreover, the intermolecular hydrogen-bonds induce an energetic downshift of the lowest unoccupied molecular orbital of molecules within assemblies compared to isolated molecules on the surface. In addition to the organic motifs, metal-organic chains with incorporation of Au atoms are also formed. Here, the coordination modifies the molecular orbital energy alignment and spatial distribution within individual molecules depending on the bonding structure. Our results demonstrate that one can manipulate the molecular structural configuration and electronic geometry by tuning its chemical environments with site-specific.