Structural Transformation of Surface-Confined Porphyrin Networks by Addition of Co Atoms

Brian Baker, Mihaela Enache, Kathrin Küster, Florian Studener, Tien-Lin Lee, Nicolas Marets, Veronique Bulach*, Mir Wais Hosseini*, Meike Stöhr*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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.
Original languageEnglish
Pages (from-to)12430-12436
Number of pages7
JournalChemistry - A European Journal
Volume27
Issue number48
DOIs
Publication statusPublished - 25-Aug-2021

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