Journal of Radioanalytical and Nuclear Chemistry

, Volume 162, Issue 1, pp 71–78 | Cite as

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

  • F. M. Elzawawy
  • E. A. Saad
  • I. H. Badr


The isotope exchange reaction between Na36Cl and triphenyltin chloride in dioxane-water (80∶20% w/w) and ethanol-water (90∶10% w/w) mixed solvents have been studied at 25°C, 35°C 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−65,556/RT [Ph3SnCl]α[NaCl] in dioxane-water and Re=6.61·108 e−69,595/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 ‡H*, ‡S* and ‡G* are reported.


Hydrogen Chloride Hydrogen Bond Chlorine Exchange Reaction 
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Copyright information

© Akadémiai Kiadó 1992

Authors and Affiliations

  • F. M. Elzawawy
    • 1
  • E. A. Saad
    • 1
  • I. H. Badr
    • 1
  1. 1.Chemistry Department, Faculty of ScienceAin Shams UniversityCairo(Egypt)

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