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Structural Transformation of Surface‐Confined Porphyrin Networks by Addition of Co Atoms
Author(s) -
Baker Cortés Brian D.,
Enache Mihaela,
Küster Kathrin,
Studener Florian,
Lee TienLin,
Marets Nicolas,
Bulach Véronique,
Hosseini Mir Wais,
Stöhr Meike
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101217
Subject(s) - scanning tunneling microscope , porphyrin , x ray photoelectron spectroscopy , crystallography , monolayer , cobalt , molecule , low energy electron diffraction , chemistry , annealing (glass) , nickel , materials science , electron diffraction , photochemistry , nanotechnology , inorganic chemistry , diffraction , chemical engineering , organic chemistry , physics , optics , engineering , composite material
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.