Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.7: Talk
Thursday, March 15, 2018, 16:45–17:00, MA 004
Structural transformation of surface-confined porphyrin networks via addition of Co atoms — •Brian Baker1, Florian Studener1, Kathrin Müller1, Mihaela Enache1, Nicolas Marets2, Veronique Bulach2, Mir Wais Hosseini2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen — 2Laboratoire de Tectonique Moleculaire, UMR UDS-CNRS 7140, Universite de Strasbourg
The self-assembly process of a nickel-porphyrin (Ni-DPPyP) derivative containing two pyridyl coordinating sites and two pentyl chains at trans meso positions under ultrahigh vacuum on Au(111) was studied with scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED). Deposition of Ni-DPPyP onto Au(111) gave rise to the formation of a close-packed network with a square unit cell as revealed by STM and LEED. The molecular arrangement of this two-dimensional network is stabilized via hydrogen bonds formed between the pyridyl's nitrogen and hydrogen atoms from the pyrrole groups of neighboring molecules. Subsequent deposition of cobalt atoms onto the close-packed network and annealing at 150 degrees celsius lead to the formation of a Co-coordinated hexagonal porous network with a rhombic unit cell. The Co-coordinated network is stabilized by metal-ligand bonds between one cobalt atom and three pyridyl ligands, each pyridyl ligand coming from a different Ni-DPPyP molecule.