Formation of Zinc(II) Complexes with Several Carboxylic Acids and Their Extraction with Carbon Tetrachloride
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概要
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The distribution of zinc(II) was determined between 0.1 M constant-ionic-strength media containing sodium perchlorate and/or carboxylate ions, A<SUP>−</SUP>, and carbon tetrachloride containing a neutral ligand, quinonline, Q, or the dimer of the same carboxylic acid, (HA)<SUB>2</SUB>. The distribution ratio was measured as a function of the concentration of carboxylate ions in the aqueous phase or of that of one of the above neutral ligands, in the organic phase. The extraction constant of the ZnA<SUB>2</SUB> species in the caproic acid system was found to be <I>K</I><SUB>exA</SUB>=[ZnA<SUB>2</SUB>]<SUB>org</SUB>/[Zn<SUP>2+</SUP>][A<SUP>−</SUP>]<SUP>2</SUP>=10<SUP>−0.15</SUP>, while that in the valeric or butyric acid system was too small to be determined. The distribution ratio of zinc(II) increased with an increase in the concentration of the ligand in the organic phase. These increases were explained by the formation of adducts in the organic phase; in the caproate system, the species found were ZnA<SUB>2</SUB>Q, and ZnA<SUB>2</SUB>Q<SUB>2</SUB>, (β<SUB>1(org)</SUB>=[ZnA<SUB>2</SUB>Q]<SUB>org</SUB>/[ZnA<SUB>2</SUB>]<SUB>org</SUB>[Q]<SUB>org</SUB>=10<SUP>1.92</SUP>, β<SUB>2(org)</SUB>=[ZnA<SUB>2</SUB>Q<SUB>2</SUB>]<SUB>org</SUB>/[ZnA<SUB>2</SUB>]<SUB>org</SUB>[Q]<SUB>org</SUB><SUP>2</SUP>=10<SUP>2.84</SUP>) or ZnA<SUB>2</SUB>(HA)<SUB>4</SUB> (β<SUB>2(org)</SUB>=[ZnA<SUB>2</SUB>(HA)<SUB>4</SUB>]<SUB>org</SUB>/[ZnA<SUB>2</SUB>]<SUB>org</SUB>[(HA)<SUB>2</SUB>]<SUB>Org</SUB><SUP>2</SUP>=10<SUP>2.92</SUP>). No polynuclear species was found in these organic phases when the initial zinc(II) concentration in the aqueous phase was less than 10<SUP>−3</SUP> M.
- 公益社団法人 日本化学会の論文
著者
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Moriya Hiromitsu
Department of Chemistry, Science University of Tokyo
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Sekine Tatsuya
Departemnt of Chemistry, Science University of Tokyo
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