Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: Nanostructures at Surfaces: Molecular Systems I

O 91.9: Vortrag

Donnerstag, 23. März 2017, 12:30–12:45, REC/PHY C213

Tuning the adsorption and self-assembly of terpyridine derivatives: From metal to bulk insulator surfaces — •Tuan Anh Pham1, Yi Liu1, Manh Thuong Nguyen2, and Sabine Maier11Department of Physics, University Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany — 2Center for Computational Physics, Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan St., Hanoi, Vietnam

Controlling and understanding the on-surface self-assembly of organic molecules are of utmost importance for the effective usage of molecular systems in potential applications. On metal surfaces, it is well-known that the structure of the on-surface self-assembly is strongly dependent on the subtle balance between molecule-molecule and molecule-substrate interactions. On bulk insulators, however, the role of the molecule-substrate interaction on the structure formation is widely unexplored.

Herein, we report the self-assembly of terpyridine derivatives, on both, metal (Au and Cu) and bulk insulator surfaces (KBr), by a combination of high-resolution non contact atomic force microscopy at low temperatures and density functional theory. We achieved to selectively tune the dimensionality of the molecular structures depending on the choice of the substrate: monomeric species on Cu(111), linear chains on Au(111), and two-dimensional networks on KBr. Interestingly, we found that the substrate may induce the rotation of pyridine rings around the C-C bond axis in the terpyridine units and thus, generating the formation of H-bonds stabilizing the self-assembled networks.

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