Tuning the self-assembly of a ditopic crown ether functionalized oligo(p-phenylenevinylene)
| Autor: | E. W. Meijer, J.L.J. van Dongen, Jeroen C. Gielen, Pall Thordarson, Peter C. M. Christianen, Albertus P. H. J. Schenning, Pim G. A. Janssen, Pascal Jonkheijm |
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| Přispěvatelé: | Macromolecular and Organic Chemistry, Macro-Organic Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Chloroform Silicon Stereochemistry Substrate (chemistry) chemistry.chemical_element Correlated Electron Systems / High Field Magnet Laboratory (HFML) General Chemistry Potassium ions Light scattering Fluorescence spectroscopy chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry GeneralLiterature_REFERENCE(e.g. dictionaries encyclopedias glossaries) Cotton effect Crown ether |
| Zdroj: | Journal of Materials Chemistry, 17(25), 2654-2660. Royal Society of Chemistry Journal of Materials Chemistry, 17, 25, pp. 2654-2660 Journal of Materials Chemistry, 17, 2654-2660 |
| ISSN: | 0959-9428 |
| Popis: | A chiral ditopic crownether functionalized oligo(p-phenylenevinylene), COPV, has been synthesized and fully characterized. The binding properties and the organization of COPV have been studied in solution and in the solid state. In chloroform, due to the benzo-15-crown-5 moieties, COPV is able to bind cations. In case of K+ a strong 2 : 2 complex is formed in which two COPVs are sandwiched between two potassium ions. Na+ is bound following a two-step negative cooperative process to form a 2 : 1 Na+/COPV complex. When COPV in the presence of potassium ions is drop-cast on a silicon substrate, fibers are formed. In waterCOPV forms stable helical aggregates as can be concluded from the Cotton effect, the UV-vis and fluorescence spectroscopy. AFM and light scattering studies show that ellipsoidal aggregates are present in water. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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