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Kinetics of chlorine isotope exchange reaction between sodium chloride-36 and triphenyltin chloride in mixed solvents

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Abstract

Isotope exchange reaction between NaCl-36 and triphenyltin chloride in dioxane-water (80∶20% w/w) and ethanol-water (90∶10% w/w) mixed solvents has been studied at 25, 35 and 50 °C. The exchange reaction was found to proceed via a bimolecular SN2, limiting mechanism with reaction rates depending on the solvent used. Inhibition of the exchange in ethanol-water is probably due to solvation of chloride ion through hydrogen bond formation. The rate laws for the exchange reactions are: Re=3.24×109 e−65550/RT [Rh3SnCl] α [NaCl] in dioxanewater and Re=6.61×108 e−69600/RT [Ph3SnCl] α [NaCl] in ethanol-water, where α is the degree of dissociation of NaCl and Re is the rate of exchange in mol l−1 s−1. The activation parameters ΔH*, ΔS* and ΔG* are reported.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt

    F. M. Elzawawy, E. A. Saad & I. H. Badr

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  1. F. M. Elzawawy
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  2. E. A. Saad
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  3. I. H. Badr
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Elzawawy, F.M., Saad, E.A. & Badr, I.H. Kinetics of chlorine isotope exchange reaction between sodium chloride-36 and triphenyltin chloride in mixed solvents. Journal of Radioanalytical and Nuclear Chemistry Letters 164, 141–151 (1992). https://doi.org/10.1007/BF02163766

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  • DOI: https://doi.org/10.1007/BF02163766

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