Coverage-Dependent Structural Transformation of Cyano-Functionalized Porphyrin Networks on Au(111) via Addition of Cobalt Atoms
| Autor: | Meike Stöhr, Nico Schmidt, Brian D Baker Cortés, Mihaela Enache |
|---|---|
| Přispěvatelé: | Surfaces and Thin Films |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Article law.invention Metal chemistry.chemical_compound DESIGN law CHEMISTRY Monolayer Molecule Physical and Theoretical Chemistry COMPLEX Low-energy electron diffraction COORDINATION NETWORK 021001 nanoscience & nanotechnology Porphyrin 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials CU(111) Crystallography General Energy chemistry visual_art visual_art.visual_art_medium Scanning tunneling microscope 0210 nano-technology Cobalt Derivative (chemistry) BEHAVIOR |
| Zdroj: | Journal of Physical Chemistry C, 123(32), 19681-19687. AMER CHEMICAL SOC The Journal of Physical Chemistry. C, Nanomaterials and Interfaces |
| ISSN: | 1932-7447 |
| Popis: | The self-assembly process of a cobalt-porphyrin derivative (Co-TCNPP) containing cyanophenyl substituents at all four meso positions on Au(111) was studied by means of scanning tunneling microscopy (STM) and low energy electron diffraction (LEED) under ultrahigh vacuum conditions. Deposition of Co-TCNPP onto Au(111) gave rise to the formation of a close-packed H-bonded network, which was independent of coverage as revealed by STM and LEED. However, a coverage-dependent structural transformation took place upon the deposition of Co atoms. At monolayer coverage, a reticulated long-range ordered network exhibiting a distinct fourfold Co coordination was observed. By reduction of the molecular coverage, a second metal-organic coordination network (MOCN) was formed in coexistence with the fourfold Co-coordinated network, that is, a chevron structure stabilized by a simultaneous expression of H-bonding and threefold Co coordination. We attribute the coverage-dependent structural transformation to the in-plane compression pressure exerted by the molecules deposited on the surface. Our study shows that a subtle interplay between the chemical nature of the building blocks (molecules and metallic atoms) and molecular coverage can steer the formation of structurally different porphyrin-based MOCNs. |
| Databáze: | OpenAIRE |
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