Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Inorganic/Organic Interfaces: Growth III
O 20.11: Vortrag
Dienstag, 17. März 2015, 13:00–13:15, MA 005
Covalently bonded networks by surface-confined coupling of copper-octabromotetraphenylporphyrin — •Lars Smykalla1, Pavel Shukrynau1, Marcus Korb2, Rasha K. Al-Shewiki2, Heinrich Lang2, and Michael Hietschold1 — 1Technische Universität Chemnitz, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany — 2Technische Universität Chemnitz, Inorganic Chemistry, D-09107 Chemnitz, Germany
We demonstrate the on-surface synthesis of a two-dimensional covalent organic network starting from copper-2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrin molecules. Results of this molecule on Au(111) [1] are compared to its adsorption on the more reactive and anisotropic Ag(110) surface. Splitting-off of bromine atoms bonded at the macrocyclic core of the porphyrin is monitored by X-ray photoelectron spectroscopy for different annealing steps. Upon annealing to high temperatures depending on the substrate, direct coupling between the reactive carbon sites of the molecules occurs which links the molecular macrocycles with phenyl groups of adjacent molecules. Thus, the initial, ordered, non-covalently interconnected supramolecular structure is completely transformed into a close-packed covalently bonded network of overall good quality. The structures are characterized using scanning tunneling microscopy. Lattice defects and the change of the electronic structure are discussed.
[1] L. Smykalla, P. Shukrynau, M. Korb, H. Lang, M. Hietschold: "Surface-confined 2D polymerization of a brominated copper-tetraphenylporphyrin on Au(111)", under review