Solvation effect on the complex formation between o-quinones and metal chlorides in nonaqueous media.

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概要

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• The complex formation of <I>o</I>-quinones with metal chlorides was studied by means of spectrophotometry in CH<SUB>3</SUB>NO<SUB>2</SUB> and CH<SUB>3</SUB>CN, where the metal chloride behaved as a nonelectrolyte. The results obtained in both solutions showed that the complex formation was obviously affected by the solvation of CH<SUB>3</SUB>CN to the metal chloride. The participation of CH<SUB>3</SUB>CN in the <I>o</I>-quinone–ZnCl<SUB>2</SUB> complex was assumed as a result of comparing the Δν<SUB>max</SUB> values, and the results obtained by NMR and spectrophotometry proved the coordination of two molecules of CH<SUB>3</SUB>CN to the complex. The values of <I>K</I><SUB>c</SUB> in CH<SUB>3</SUB>NO<SUB>2</SUB> increased in the order of BiCl<SUB>3</SUB><ZnCl<SUB>2</SUB>, whereas those in CH<SUB>3</SUB>CN were in the reverse order; this fact was ascribed to the number of the solvent molecules liberated in the complex formation. The conventional elimination of the solvation effect from the observed <I>K</I><SUB>c</SUB> was proposed in order to obtain a parameter of solvation-free <I>K</I><SUB>c</SUB>.

• 公益社団法人 日本化学会の論文

著者

• Takagi Tatsuya

  Faculty Of Pharmaceutical Sciences Osaka University

• SASAKI YOSHIO

  Faculty of Pharmaceutical Sciences Osaka University

• Kataoka Kazuaki

  Faculty of Pharmaceutical Sciences, Osaka University

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