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Colloidal Assemblies Effect on Chemical Reactions.

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Periodic rept. no. 4, Aug 86-Jan 87,

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Pursued has been the study on the role of colloidal assemblies in the control of the mechanism and rates of chemical reactions. The properties and applications of functionalized surfactants in particular with the polar head having complexing capability have been reviewed in order to select proper assemblies for enrichment and catalytic purposes. The phase separation of non-ionic surfactant solutions above the cloud point can be practically exploited for liquid-liquid extraction of hydrophobic metal-chelate complexes, which can be concentrated in the low volume micellar phase. A model reaction system consisting of a series of suitable amphiphilic ligands with a tuned alkyl chain 4-alkylamido-2-hydroxybenzoic acids PAS-Cn, where Cn R-CO- and a reactive metal ion iron III has been investigated in the presence of non-ionic Brij 35 micelles. The formation of 11 complexes in acidic solution has been assessed and the corresponding apparent formation constants have been determined using the usual spectrophotometric techniques. The effect of the micellar system on the ligand acid-base equilibrium has been also investigated and, from the variation of the pKa values with surfactant concentration and from micellar HPLC measurements, the binding constants of the ligands to the aggregates have been evaluated.

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  • Organic Chemistry

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