Supramolecular organic-inorganic hybrid assemblies with tunable particle size: interplay of three noncovalent interactions.

Cylindrical polyelectrolyte-comb-surfactant complexes

Abstract Quaternized polymer combs based on poly(2-vinylpyridine-macromonomers) and the surfactant sodium dodecylsulfate are employed in the synthesis of a novel cylindrical polyelectrolyte-comb-surfactant complex (PECSC). The complex formed has 1:1 stoichiometry with respect to the ratio of dodecylsulfate to pyridinium units. It is soluble in organic solvents such as 2-butanol or chloroform. Characterization of single particle properties of the complex in organic solution is possible and yields a radius of gyration of 〈Rg〉z = 78.4 nm, a hydrodynamic radius of 〈1/Rh〉z−1 = 51.4 nm and a cross-sectional radius of Rg,cross = 3.9 nm in chloroform. The characteristic ratio γ = 〈Rg〉z/〈1/Rh〉z−1 de…

Supramolekulare organisch-anorganische Hybridaggregate mit variabler Partikelgröße: Zusammenspiel von drei nichtkovalenten Wechselwirkungen

Porphyrin-Polymer Networks, Worms, and Nanorods: pH-triggerable Hierarchical Self-assembly

In this study, we present a novel, multifaceted pH-triggerable system of self-organized hierarchical nanostructures. The system consists of meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) and poly(2-vinylpyridine) cylindrical brushes (PVP brushes) and can yield polymer-porphyrin networks, porphyrin loaded polymer brushes and pure porphyrin nanorods. In addition, the polymer influences the pK(a) and the mutual TPPS stacking geometry. Structures were characterized by AFM, dynamic light scattering using an IR laser, UV-Vis spectroscopy and small-angle neutron scattering (SANS). Supramolecular composite porphyrin structures that can be switched through external triggers have potential in photo…

Polystyrene Sulfonate–Porphyrin Assemblies: Influence of Polyelectrolyte and Porphyrin Structure

In this study, electrostatic self-assembly of different polystyrene sulfonates and a set of tetravalent cationic porphyrins is investigated. It is shown that association of linear polystyrene sulfonates of different molar masses yields finite size nanoscale assemblies that are stable in aqueous solution. Aggregates are compared to the ones of cylindrical brushes, revealing that both form assemblies in the 100 nm range with the charge ratio (molar ratio of porphyrin charges to polyelectrolyte charges) being determining, while the morphology of the resulting network-like assemblies is different for both polyelectrolyte architectures. For the smallest 8k polystyrene sulfonate, in addition, sto…

Makromolekulare Chemie 2005

Der Trend geht zu masgeschneiderten Polymerarchitekturen und -morphologien sowie selbstorganisierten supramolekularen Strukturen. Dabei ist die Polymerchemie stark interdisziplinar: Von der Renaissance klassisch „organischer” Synthesekonzepte spannt sich der Bogen bis zu Nanoteilchen fur biomedizinische Anwendungen – Grundlagenforschung und Anwendung treffen sich in der makromolekularen Chemie.