Potentiometric study of equilibria in H+-MoO42-RAsO3H- (R=OH, C6H5, CH3) systems.

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概要

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• The equilibria <I>p</I>H<SUP>+</SUP>+<I>q</I>MoO<SUB>4</SUB><SUP>2−</SUP>+<I>r</I>RAsO<SUB>3</SUB>H<SUP>−</SUP>\rightleftharpoons(H<SUP>+</SUP>)<I><SUB>p</SUB></I>(MoO<SUB>4</SUB><SUP>2−</SUP>)<I>q</I>(RAsO<SUB>3</SUB>H<SUP>−</SUP>)<I>r</I> have been studied in 1 M Na(Cl) (1 M=1 mol dm<SUP>−3</SUP>) at 25 °C by potentiometry. Heteropoly species which have <I>q</I>⁄<I>r</I> ratios higher than 5 have been found in the R=CH<SUB>3</SUB> and R=C<SUB>6</SUB>H<SUB>5</SUB> systems besides the well known species of <I>q</I>⁄<I>r</I>=3. The species, denoted by (<I>p</I>,<I>q</I>,<I>r</I>) according to the equation above, (10, 7, 1), (11, 7, 1), and (11, 6, 1) are proposed as those high ratio species. The formation constant of each species has been determined. The result showed an apparent correlation with p<I>K</I><SUB>a</SUB>'s of arsenic acid and its organic derivatives. Solution structures of the heteropoly species are also discussed.

• 公益社団法人 日本化学会の論文

著者

• Sasaki Yukiyoshi

  Department of Chemistry and The Research Centre for Spectrochemistry, Faculty of Science, The University of Tokyo

• Yagasaki Atsushi

  Department of Chemistry, Faculty of Science, The University of Tokyo

• Takahama Hironobu

  Department of Chemistry, Faculty of Science, The University of Tokyo

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