The complex formation of the copper(II) ion with ethylenediaminetetraacetic acid and N-(2-hydroxyethyl)ethylenediamine-N,N',N'-triacetic acid.
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概要
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The complex formation of the Cu(II) ion with ethylenediaminetetraacetic acid (EDTA) and <I>N</I>-(2-hydroxyethyl)ethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′-triacetic acid (HEDTA) has been studied potentiometrically and polarographically over the wide pH range from 1 to 11 in aqueous solutions containing 1.0 mol dm<SUP>−1</SUP> NaClO<SUB>4</SUB> at 25.0 °C. Both the emf data obtained by potentiometric titrations and the pH-dependence of reversible half-wave potentials were explained in terms of the formation of the following complex species: for the Cu–EDTA complexes, CuL<SUP>2−</SUP> (logβ<SUB>101</SUB>=17.28±0.04), CuHL<SUP>−</SUP> (logβ<SUB>111</SUB>=20.15±0.04), CuH<SUB>2</SUB>L(logβ<SUB>121</SUB>=22.73±0.04), CuH<SUB>3</SUB>L<SUP>+</SUP>(logβ<SUB>131</SUB>=24.12±0.04), and CuH<SUB>−1</SUB>L<SUP>3−</SUP> (logβ<SUB>1−11</SUB>=6.83±0.05); for the Cu–HEDTA complexes, CuL<SUP>−</SUP> (logβ<SUB>101</SUB>=16.30±0.05), CuHL (logβ<SUB>111</SUB>=18.76±0.04), CuH<SUB>2</SUB>L<SUP>+</SUP> (logβ<SUB>121</SUB>=19.85±0.04) and CuHL<SUB>−1</SUB>L<SUP>2−</SUP> (logβ<SUB>1−11</SUB>=6.35±0.05), where β<I><SUB>pqr</SUB></I>=[Cu<I><SUB>p</SUB></I>H<I><SUB>q</SUB></I>L<I><SUB>r</SUB></I>]/[Cu<SUP>2+</SUP>]<I><SUP>p</SUP></I>[H<SUP>+</SUP>]<I><SUP>g</SUP></I>[L]<I><SUP>r</SUP></I>, and where L denotes the unprotonated molecule of EDTA or HEDTA.
- 公益社団法人 日本化学会の論文
著者
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Ikeda Kazuo
Department Of Anatomy And Cell Biology Graduate School Of Medicine Osaka City University
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Oyama Noboru
Department Of Applied Chemistry Faculty Of Technology Tokyo University Of Agriculture And Technology
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Yamaguchi Shuichiro
Department Of Applied Chemistry Graduate School Of Science And Technology Tokyo University Of Agricu
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Matsuda Hiroaki
Department of Biology, Kyushu University
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Yamaguchi Shuichiro
Department of Electronic Chemistry, Graduate School at Nagatsuta, Tokyo Institute of Technology
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Oyama Noboru
Department of Electronic Chemistry, Graduate School at Nagatsuta, Tokyo Institute of Technology
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