Finite-Size Networks from Cylindrical Polyelectrolyte Brushes and Porphyrins
| Autor: | Ute Kolb, Christian Ruthard, Michael Maskos, Franziska Gröhn |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Polymers and Plastics Organic Chemistry technology industry and agriculture Supramolecular chemistry Molecular electronics Neutron scattering Porphyrin Polyelectrolyte Inorganic Chemistry chemistry.chemical_compound chemistry Dynamic light scattering Chemical engineering Polymer chemistry polycyclic compounds Materials Chemistry Counterion |
| Zdroj: | Macromolecules. 42:830-840 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | We report on the electrostatic self-assembly of negatively charged cylindrical polystyrenesulfonate (NaPSS) brushes and stiff organic counterions of different valency. In particular, the tetravalent cationic porphyrin meso-tetrakis(4-(trimethylammonium)phenyl)porphyrin (TAPP) yielded two new supramolecular architectures that are stable in aqueous solution. The porphyrin binds to the polyelectrolyte brush due to electrostatic and secondary π−π interactions and can further interconnect the brushes to nanoscale networks. In salt solution individual porphyrin-decorated cylindrical brushes were obtained. Structures formed are characterized by UV−vis spectroscopy, atomic force microscopy (AFM), cryo-transmission electron microscopy (cryo-TEM), small-angle neutron scattering (SANS), and dynamic light scattering (DLS). In order to study porphyrin aggregates by DLS, an IR laser setup (λ = 831.5 nm) was used. The new morphologies have potential as functional structures in molecular electronics and pharmaceutics. |
| Databáze: | OpenAIRE |
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