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Structural Transformation of Surface-Confined Porphyrin Networks by Addition of Co Atoms |
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| Authors: | Brian D Baker Cortés Dr Mihaela Enache Dr Kathrin Küster Florian Studener Dr Tien-Lin Lee Nicolas Marets Prof Dr Véronique Bulach Prof Dr Mir Wais Hosseini Prof Dr Meike Stöhr |
| Institution: | 1. Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
These authors contributed equally to this work.;2. Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands Present address: Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany;3. Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;4. Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE UK;5. Laboratoire de Tectonique Moléculaire, UMR Unistra-CNRS 7140, Université de Strasbourg, 4 rue BlaisePascal, 67070 Strasbourg, France |
| Abstract: | The self-assembly of a nickel-porphyrin derivative (Ni-DPPyP) containing two pyridyl coordinating sites and two pentyl chains at trans meso positions was studied with scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) on Au(111). Deposition of Ni-DPPyP onto Au(111) gave rise to a close-packed network for coverages smaller or equal to one monolayer 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 post-deposition annealing at 423 K led to the formation of a Co-coordinated hexagonal porous network. As confirmed by XPS measurements, the porous network is stabilized by metal-ligand interactions between one cobalt atom and three pyridyl ligands, each pyridyl ligand coming from a different Ni-DPPyP molecule. |
| Keywords: | metal-organic coordination networks molecular self-assemblies scanning tunneling microscopy X-ray photoelectron spectroscopy |