Hauptseite > Publikationsdatenbank > Self-assembly of porphyrin hexamers via bidentate metal–ligand coordination > print

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005     20210129235350.0
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100 1 _ |a Lensen, Marga C.
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245 _ _ |a Self-assembly of porphyrin hexamers via bidentate metal–ligand coordination
260 _ _ |a London
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520 _ _ |a The supramolecular assembly of metal-porphyrin hexamers with bidentate ligands in chloroform solutions is demonstrated by UV/Vis and 1H NMR-titrations, and Small Angle Neutron Scattering (SANS) experiments. Titrations of zinc porphyrin hexamer Zn1 with 1,4-diazabicyclo[2,2,2]octane (DABCO) revealed that at a DABCO/Zn1 molar ratio of 3, intermolecular sandwich complexes are formed, which can be considered as “circular-shaped porphyrin ladders”. These supramolecular complexes further aggregate into larger polymeric stacks, as a result of a combination of cooperativity effects, pi−pi stacking interactions, and chelate effects. The presence of rodlike assemblies in solution, formed by assembly of Zn1 and DABCO, is confirmed by SANS-experiments. Using a model for cylindrical assemblies, curve fitting calculations reveals that rods with an average length of 26 nm and a radius of 30-35 Å were formed, corresponding to columnar stacks of approximately 30 hexamer molecules. In contrast, the metal-free hexamer H_2 1 did not form extended assemblies due to the absence of coordinative intermolecular interactions.
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650 1 7 |a Polymers, Soft Nano Particles and Proteins
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Nolte, Roeland J. M.
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700 1 _ |a Rowan, Alan E.
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700 1 _ |a Pyckhout-Hintzen, Wim
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700 1 _ |a Feiters, Martin C.
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700 1 _ |a Elemans, Johannes A. A. W.
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773 _ _ |a 10.1039/C8DT01572D
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