FN ISI Export Format VR 1.0 PT J TI Structural Transformation of Surface-Confined Porphyrin Networks by Addition of Co Atoms AF Baker Cortés, Brian D. Enache, Mihaela Küster, Kathrin Studener, Florian Lee, Tien-Lin Marets, Nicolas Bulach, Véronique Hosseini, Mir Wais Stöhr, Meike AU Baker Cortés, BD Enache, M Küster, K Studener, F Lee, T Marets, N Bulach, V Hosseini, MW Stöhr, M SO Chemistry - A European Journal VL 27 BP 12430 EP 12436 PY 2021 AB 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. ER