Structure and Thermodynamics of Ionic Dendrimer-Dye Assemblies

摘要: In this study, the association (“electrostatic self-assembly”) of cationic generation 4 poly(amidoamine) dendrimer with a set oppositely charged aromatic and aliphatic organic sulfonate counterions was investigated. Aggregate size shape depend on counterion structure. Formation defined assemblies possible stiff, mutually interacting azo-dye (acid red dyes Ar26, Ar44, Ar27, Ar18) but not flexible or small disulfonates sulfate. Dynamic light scattering yielded sizes in order 100 nm. Particle shapes as investigated by small-angle neutron were spherical, ellipsoidal, cylindrical, core−shell type. Results revealed that molar charge ratio components is crucial factor aggregation. UV−vis showed cooperative binding process twist angles dye molecules 15° to 30° according exciton theory. Isothermal titration calorimetry dendrimer−dye assembly formation comparison systems gave info...