Studies on the complex formation between o-quinones and metal chlorides in nitromethane solution.

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概要

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• Complex formation between several kinds of metal chlorides and 4,5-dimethoxy-1,2-benzoquinone (<B>1</B>) or 4-methoxy-1,2-naphthoquinone (<B>2</B>) has been studied by means of NMR and spectrophotometry in CH<SUB>3</SUB>NO<SUB>2</SUB>. Stability constants of the 1 : 1 complex were found to decrease in the order of SnCl<SUB>4</SUB>>InCl<SUB>3</SUB>>ZnCl<SUB>2</SUB>>BiCl<SUB>3</SUB>>SbCl<SUB>3</SUB>>HgCl<SUB>2</SUB>. Δδ<SUB>ML</SUB> and Δν<SUB>max</SUB>, which indicate the change in the chemical shift and the wavenumber on the formation of the 1 : 1 complex, were also arranged in the above order. The same order was reproduced from an electrostatic potential. Both Δδ<SUB>ML</SUB> and Δν<SUB>max</SUB> were proved to be a convenient scale for the relative acceptor strength of metal chlorides. For the basicity of <I>o</I>-quinones, the order of <B>1</B>><B>2</B> was obtained from the thermodynamic data and from the negative charge on the carbonyl oxygens. The solute-solvent interaction model was also found appliciable in this system.

• 公益社団法人 日本化学会の論文

著者

• SASAKI YOSHIO

  Faculty of Pharmaceutical Sciences Osaka University

• Kataoka Kazuaki

  Faculty of Pharmaceutical Sciences, Osaka University

• Shirakawa Fumiko

  Faculty of Pharmaceutical Sciences, Osaka University

• Kimura Sumihisa

  Faculty of Pharmaceutical Sciences, Osaka University

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