A potentiometric study on mixed ligand cadmium(II) complexes with 2-pyridinecarboxylic acid and 2-aminoalkanoic acids.
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概要
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Formation constants of cadmium(II) complexes with 2-pyridinecarboxylic acid (Hpic) were determined in aqueous solutions containing 3 mol dm<SUP>−3</SUP> LiClO<SUB>4</SUB> as a constant ionic medium at 25 °C by potentiometric titrations. On the basis of the formation constants of the complexes thus determined and those of the 2-aminoalkanoate complexes previously obtained, formation constants of mixed ligand cadmium(II) complexes CdL(pic) were determined, where L<SUP>−</SUP> denotes a 2-aminoalkanoate ion such as glycinate (gly<SUP>−</SUP>), α-alaninate (ala<SUP>−</SUP>), 2-aminobutanoate (but<SUP>−</SUP>), 2-aminopentanoate (pen<SUP>−</SUP>), or 2-aminohexanoate (hex<SUP>−</SUP>) ion. The formation constants logβ<SUB>111</SUB>=log {[CdL(pic)]/([Cd<SUP>2+</SUP>][L<SUP>−</SUP>][pic<SUP>−</SUP>])} of the 1:1:1 mixed ligand cadmium(II) complexes are: Cd(gly)(pic), 8.88; Cd(ala)(pic), 8.47; Cd(but)(pic), 8.42; Cd(pen)(pic), 8.73; and Cd(hex)(pic), 8.76. The equilibrium constant of the reaction between Cd(gly)<SUP>+</SUP> and pic<SUP>−</SUP> was larger than that between Cd(pic)<SUP>+</SUP> and gly<SUP>−</SUP>, and much larger than the equilibrium constants between CdL<SUP>+</SUP> and L′<SUP>−</SUP> previously studied, where L<SUP>−</SUP> and L′<SUP>−</SUP> are 2-aminoalkanoate anions.
- 公益社団法人 日本化学会の論文
著者
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Ohtaki Hitoshi
Department Of Chemistry Faculty Of Science And Engineering Ritsumeikan University
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Matsui Haruo
Government Industrial Research Institute, Nagoya
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