Use of the copper(II) ion-selective electrode for the determination of the stability constant of binuclear copper(II) complex with 3,6-dioxaoctane-1,8-diamine-N,N,N',N'-tetraacetric acid.
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概要
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The stability constant of binuclear copper(II) complex with 3,6-Dioxaoctane-1,8-diamine-<I>N</I>,<I>N</I>,<I>N</I>′,<I>N</I>′-tetraacetric acetic acid (ethylene glycol bis[2-[bis(carboxymethyl)amino] ethyl] ether, customarily abbreviated to EGTA of Y) was determined on the basis of potentiometric titration by means of a copper(II) ion-selective electrode. In acetate buffer solution of pH 5.8 titration curves of copper(II) with EGTA show two distinct end points corresponding to Cu<SUB>2</SUB>Y and CuY complexes. The formation constant of the binuclear copper(II) complex was determined from the potential response in the titration fraction between first and second end points. The logarithmic value was found to be log <I>K</I><SUB>Cu<SUB>2</SUB>Y</SUB>=6.40 at ionic strength of 0.2 M (KNO<SUB>3</SUB>–acetate buffer solution) at 25±0.5 °C.
- 公益社団法人 日本化学会の論文
著者
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Ohzeki Kunio
Department Of Chemistry Faculty Of Science Hirosaki University
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Kambara Tomihito
Department Of Chemistry Faculty Of Science Hokkaido University
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Saruhashi Masakuni
Department of Chemistry, Faculty of Science, Hokkaido University
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