Spectrophotometric study of uranium(VI) chelate formation with beta-diketones and tributyl phosphate in aqueous, nona(oxyethylene) dodecyl ether solution.
The distribution ratio of uranium(VI) with 2-thenoyltrifluoroacetone, 2-furoyltrifluoroacetone and benzoyltrifluoroacetone in the presence and absence of tributyl phosphate between micellar and bulk phases in nona(oxyethylene) dodecyl ether solution was measured spectrophotometrically as a function of hydrogen-ion concentration. The thermodynamic constants for these reactions were evaluated from the variation of the equilibrium constants as a function of temperature. The entropy change contributes to the synergistic reaction.
Modeling of chemical reactions in micelle: water-mediated keto-enol interconversion as a case study.
The effect of a zwitterionic micelle environment on the efficiency of the keto-enol interconversion of 2-phenylacetylthiophene has been investigated by means of a joint application of experimental and theoretical/computational approaches. Results have revealed a reduction of the reaction rate constant if compared with bulk water essentially because of the different solvation conditions experienced by the reactant species, including water molecules, in the micelle environment. The slight inhibiting effect due to the application of a static electric field has also been theoretically investigated and presented.
Synergism in the solvent extraction of di-, tri- and tetravalent metal ions—V: Infra-red studies of the isolated complexes
Abstract In the synergistic extractions of metal ions with the systems 1,1,1-trifluoro-3-2′-thenoyl acetone (HTTA) and neutral organophosphorus compounds, stable complexes have been isolated from the organic phase. These have the following formulae: UO2(TTA)2S1, UO2(TTA)2S3, Th(TTA)4S1 and Rare Earth (TTA)3S2, where S = a neutral organophosphorus compound. The infra-red spectra of these complexes have been obtained and are discussed in terms of various possible structures.