1985 Volume 58 Issue 6 Pages 1741-1744
Molecular interaction of Me2SnCl2 with Lewis bases has been investigated by measuring the concentration and temperature dependence of NMR coupling constant 2J(119Sn,H). It is found that 1 : 1 and 1(acid):2(base) complexes are formed concurrently in solution. Association constants and coupling constants in these complexes are determined at different temperatures, leading to the enthalpies ΔH° and entropies ΔS° for the relevant molecular interaction. The coupling constants are temperature independent and a merit of using this constant as a diagnostic tool has been proven. The E and C parameter treatment of ΔH°AB has given reasonable EA and CA values for Me2SnCl2. Entropies ΔS° are also estimated in gas phase on the basis of molecular theory for the third-law entropy, and the contribution from solvation is shown important in the solution of CHCl2CHCl2.
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