Modulation of Guest Partitioning Within Dendrimer-Surfactant Supramolecular Assemblies

Electrostatic interactions are used to create a template-assisted supramolecular assembly consisting of a polymeric dendrimer at the core and amphiphilic substrates on the periphery. The dendrimer generation and the chemical structure of the amphiphiles are varied to construct multiple and distinct...

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Bibliographic Details
Published in:	Journal of dispersion science and technology Vol. 23; no. 6; pp. 737 - 746
Main Authors:	Karukstis, Kerry K., Thonstad, Stacey C., Hall, Megan E.
Format:	Journal Article
Language:	English
Published:	Philadelphia, PA Taylor & Francis Group 12-01-2002 Taylor & Francis
Subjects:	Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Physical and chemical studies. Granulometry. Electrokinetic phenomena Self assembly Structure effect Hydrocarbon Electrostatic interaction Fluorescence Location parameter Experimental study Sulfates Condensed benzenic compound Naphthalene derivatives Amidoamine polymer Anionic surfactant Molecular assembly Supramolecular structure Concentration effect Measurement method Aqueous solution Dendritic structure
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Summary:	Electrostatic interactions are used to create a template-assisted supramolecular assembly consisting of a polymeric dendrimer at the core and amphiphilic substrates on the periphery. The dendrimer generation and the chemical structure of the amphiphiles are varied to construct multiple and distinct microenvironments within the dendrimer-ligand complex for encapsulation of small guest molecules. In particular, these investigations employ a guest molecule that is a neutral fluorescent probe that exhibits an emission wavelength with an extreme sensitivity to the polarity of its surroundings. Partitioning of the fluorophore within the various microregions of the dendrimer-surfactant supramolecular complex is distinguished by the characteristic emission wavelengths of the overlapping Gaussian functions comprising the overall fluorescence spectrum. The observed variations in the prodan emission spectrum suggest interaction of prodan at protonated amino groups (460-nm emission), within dendritic branches and surfactant tails (490-nm emission), and in interior regions of the dendrimer core (430-nm emission). We demonstrate that the positioning of the guest molecule within the supramolecular complex can be modulated through the selection of dendrimer generation, surfactant chain length, and dendrimer:surfactant concentration ratio.
ISSN:	0193-2691 1532-2351
DOI:	10.1081/DIS-120015971