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Étude par Résonance Magnétique Nucléaire de complexes calixarène-cation métallique en solution

Abstract : Nuclear Magnetic Resonance spectroscopy is widely used for the study of host-guests complexes. However, the complexes between a calixarene (as the p-sulfonatocalix[4]arene which we used here) and monovalent metal cations (as cesium and thallium which are the subject of this thesis) were until know studied only by chemical shift measurements. In addition to chemical shift, this thesis will be primarily based on the dynamic parameters determined by NMR. The first idea was to measure the self-diffusion coefficients of the host and guest molecules. The relevant NMR technique which allows such measurements seems sufficiently developed so as to provide information on the nature of the complex (inclusion in the cavity of calixarene), its stoichiometry or its association constant. We then exploited the wealth of information arising from spin relaxation measurements. This information, known to be of both structural and dynamic nature, made it possible the characterization of these complexes in a very precise way. The carbons-13 relaxation measurements of calixarene itself were actually supplemented by the longitudinal and the transverse relaxation measurements of the two cations. Not only the inclusion of the two cations in the cavity was confirmed, but the precise localization could be obtained through the chemical shift anisotropy mechanism, which also, demonstrates clearly the existence of cation- interactions. We thus showed the perfect consistence of the interpretation of various NMR parameters for the characterization of the complexes studied in this thesis.
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  • HAL Id : tel-01748407, version 1

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Diana Cuc Mozolea. Étude par Résonance Magnétique Nucléaire de complexes calixarène-cation métallique en solution. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10064⟩. ⟨tel-01748407⟩

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