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Self-assembly of porphyrin hexamers via bidentate metal-ligand coordination.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lensen, Marga C. Nolte, Roeland J. M. Rowan, Alan E. Pyckhout-Hintzen, Wim Feiters, Martin C. Elemans, Johannes A. A. W. |
| Copyright Year | 2018 |
| Abstract | 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, π-π 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 reveal 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 H21 did not form extended assemblies due to the absence of coordinative intermolecular interactions. |
| Starting Page | 14277 |
| Ending Page | 14287 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/c8dt01572d |
| PubMed reference number | 29881835 |
| Journal | Medline |
| Volume Number | 47 |
| Issue Number | 40 |
| Alternate Webpage(s) | https://repository.ubn.ru.nl/bitstream/handle/2066/197189/197189pre.pdf?sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.1039/c8dt01572d |
| Journal | Dalton transactions |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
