The polarography of the cadmium(II)-2-carboxy-1-pyrrolidinecarbodithioate chelate.
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概要
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The electrochemical behavior of the cadmium(II) ion in the presence of 2-carboxy-1-pyrrolidinecarbodithioic acid (H<SUB>2</SUB>cpcd) as a chelating agent was investigated in an alkaline medium by d.c. polarography, a.c. polarography, cyclic voltammetry, and chronopotentiometry. The cadmium(II) chelate gave a reversible two-electron reduction wave at −0.86 V <I>vs.</I> SCE, with a postwave at −0.95 V. From the dependence of the total wave height on the mercury column height and from the methods of cyclic voltammetry, the electrode reduction of the cadmium(II) chelate was found to be diffusion-controlled. The diffusion current constant was 2.42 μA mol<SUP>−1</SUP> m<SUP>3</SUP> mg<SUP>−2⁄3</SUP> s<SUP>1⁄2</SUP>. The postwave was identified as an adsorption wave of the cadmium(II) chelate from the dependence of the postwave height on the mercury column height, the a.c. peak height, the electrocapillary curves, and the results of chronopotentiometry. The surface excess of cadmium(II) chelate adsorbed on the mercury electrode was evaluated by means of three different electrochemical techniques. The composition of the cadmium(II)–cpcd chelate in the presence of excess H<SUB>2</SUB>cpcd was Cd(cpcd)<SUB>2</SUB><SUP>2−</SUP>, and the overall stability constant was estimated to be 8.0×10<SUP>12</SUP> at 25.0 °C and μ=1.5.
- 公益社団法人 日本化学会の論文
著者
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Nomura Kazuo
Department Of Chemistry Faculty Of Science Kyushu University
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Kitagawa Toyokichi
Department of Chemistry Faculty of Education Kobe University
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Nomura Kazuo
Department of Chemistry, Faculty of Science, Osaka City University
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