Partage de quelques cryptates alcalins et alcalino-terreux entre l'eau et l'octanol

Les constantes de partage entre l'eau et l'octanol-1 des cryptates du 222 avec le potassium, le calcium et le baryum associés à quelques anions minéraux et au p-nitrophénate ont été déterminées, ainsi que les mêmes constantes relatives aux ions tétrapropylammonium et tétrabuty- lammonium. Les caractères lipophiles de ces différents cations sont comparés

Complexation of the basic amino acids lysine and arginine by three sulfonatocalix[n]arenes (n = 4, 6 and 8) in water: microcalorimetric determination of the Gibbs energies, enthalpies and entropies of complexation

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Complexation of basic amino acids by water-soluble calixarene sulphonates as a study of the possible mechanisms of recognition of calixarene sulphonates by proteins

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Binding of dipeptides and tripeptides containing lysine or arginine by p-sulfonatocalixarenes in water: NMR and microcalorimetric studies

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Thermodynamic approach of uranium(VI) extraction by N,N-(2-ethylhexyl)isobutyramide

International audienceThe study of extraction of U(VI) from LiNO3 media by N, N-(2-ethylhexyl)isobutyramide (DEHiBA) in dodecane has been performed at 25.00 degrees C using isothermal titration microcalorimetry. The raw heat measured is a sum of contributions. To obtain the net extraction enthalpy variation, different heats have to be evaluated as the dilution of amide into dodecane phase which has been measured and subtracted. The microcalorimetric extraction results are then compared to data obtained by Van't Hoff classical method. The extraction enthalpies obtained by both methods are similar. This first study allowed to define the experimental calorimetric conditions and will be followed by determination with other actinides and amides. (C) 2012 Elsevier B. V... Selection and/or peer-review under responsibility of the Chairman of the ATALANTE 2012 Program Committe