Etude cinétique et thermodynamique de réactions d'échange de protons et de complexation de cations métalliques en milieu micellaire

Abstract : This study aims at understanding the influence of micellar media on the thermodynamics and the kinetics of cations complexation and proton transfer. Two kinds of systems were studied: - On the one hand, we studied molecules which self-organize in micelles such as amphiphilic ammonium salts, to investigate the kinetics of proton transfer and alkylpolyglucosides, to determine the thermodynamics of Cu(II) complexation. - On the other hand, we analysed acid-base reactions and Cu(II) complexation involving original tartaric acid derivatives which can be solubilized in non-ionic micelles. Deep modifications of thermodynamics and kinetics parameters in the presence of micelles were demonstrated and interpreted from a fundamental point of view. We took advantages of these changes to develop new analytical techniques for CMC measurements, determination of water-micelles partition constants, identification of species solubilized in the micellar pseudophase and interpretation of the variation of Cu(II) micellar extraction yields as a function of pH. To perform these experiments, various analytical techniques were used: nuclear magnetic resonance (Dynamic and Static NMR), pHmetry, UV-visible and circular dichroism spectroscopies, micellar enhanced-ultrafiltration. The use of these techniques in micellar media was discussed.
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Laurence Dupont-Leclercq. Etude cinétique et thermodynamique de réactions d'échange de protons et de complexation de cations métalliques en milieu micellaire. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10057⟩. ⟨tel-01748415⟩

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