The solution chemistry of organotin compounds. III. A thermodynamic study of the molecular interaction of Me2SnCl2 with Lewis bases by means of nuclear magnetic resonance spectroscopy.

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概要

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• Molecular interaction of Me<SUB>2</SUB>SnCl<SUB>2</SUB> with Lewis bases has been investigated by measuring the concentration and temperature dependence of NMR coupling constant <SUP>2</SUP><I>J</I>(<SUP>119</SUP>Sn,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 Δ<I>H</I>° and entropies Δ<I>S</I>° 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 <I>E</I> and <I>C</I> parameter treatment of Δ<I>H</I>°<SUB>AB</SUB> has given reasonable <I>E</I><SUB>A</SUB> and <I>C</I><SUB>A</SUB> values for Me<SUB>2</SUB>SnCl<SUB>2</SUB>. Entropies Δ<I>S</I>° 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 CHCl<SUB>2</SUB>CHCl<SUB>2</SUB>.

• 公益社団法人 日本化学会の論文

著者

• Fujiwara Hideaki

  Faculty Of Medicine Osaka University

• SASAKI YOSHIO

  Faculty of Pharmaceutical Sciences Osaka University

• Sakai Fumihiko

  Faculty of Pharmaceutical Sciences, Osaka University

• Mikawa Yoshihiro

  Faculty of Pharmaceutical Sciences, Osaka University

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