Browsing by Author "Capparelli, Alberto L."

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    Nuclear Magnetic Relaxation Studies of Preferential Solvation in Electrolyte Solutions
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (07), 1978) Capparelli, Alberto L.; Gill, Dip S.; Hertz, H. Gerhard; Tutsch, Rüdiger; Weingärtner, Hermann
    Formulae are derived which describe the increase in the total proton magnetic relaxation rate relative to the intramolecular relaxation rate in a solvent mixture when solvent molecules of one kind are enriched in the solvation sphere of a dissolved ion. Experimental nuclear magnetic relaxation results regarding the application of these formulae for solutions of Mg(ClO4)2, KI and RbI in water + methanol mixtures are reported. It is shown that preferential solvation effects are present in these systems, they are ascribed to preferential hydration of the cations.
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    Nuclear Magnetic Relaxation Studies of Preferential Solvation in Electrolyte Solutions Another Indirect Method Using only Solvent Magnetic Interactions
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (07), 1978) Capparelli, Alberto L.; Gill, Dip S.; Hertz, H. Gerhard; Tutsch, Rüdiger
    In the mixture ROH/H2O (R = CnD2n+1) an intramolecular proton relaxation contribution due to magnetic dipole interaction only occurs in the water molecule. If the water molecules are preferentially bound to a hydrated cation undergoing relatively slow molecular motions, then only this intramolecular part reflects the slow motion. This principle was used to study preferential solvation of ions in MeOH + H2O mixtures. From the experimental results reported, it is deduced that Mg2+ is preferentially hydrated whereas, in agreement with the theory, for K+ and Rb+ the dynamical effect of preferential solvation is so small that it cannot be detected with the present method.