Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Nanostructures at Surfaces: 1D, 2D Structures and Networks
O 68.9: Poster
Wednesday, March 9, 2016, 18:15–20:30, Poster A
Self-assembly and stability of bridged triphenylamine derivatives on metal surfaces — •Christian Steiner1, Ute Meinhardt2, Bettina Gliemann2, Martin Gurrath3, Bernd Meyer3, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, FAU Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, FAU Erlangen-Nürnberg, Germany — 3Computer-Chemie-Centrum, FAU Erlangen-Nürnberg, Germany
Molecular self-assembly is a key concept in supramolecular chemistry and nanoscience allowing for the construction of complex molecular architectures in a bottom-up approach through noncovalent interactions. The adsorption, chemical nature, and self-assembly of diaminotriazinyl- and carboxyl-substituted triphenylamines with dimethylmethylene bridges were studied on Au(111) and Cu(111) at submonolayer coverage by low-temperature scanning tunneling microscopy and density functional theory calculations.[1] While the self-assemblies on Au(111) are strongly directed by intermolecular hydrogen bond interactions, on Cu(111) both molecules aggregate in dense islands owing to the stronger molecule-surface interaction. The carboxyl substituents partially deprotonate at room temperature on Cu(111). The diaminotriazinyl-substituted triphenylamines adsorb mainly intact at room temperature and deprotonate gradually at increased adsorption temperatures changing the bonding mechanism from hydrogen bonding to metal-ligand interactions.
[1] C. Steiner et al. J. Phys. Chem. C, 119 (46), 25945-25955 (2015)