A spectrophotometric study of copper(I) chloro-complexes in aqueous 5 M Na(Cl,ClO4) solutions.
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概要
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The complex formation of copper(I) ions in aqueous 5 M Na(Cl, ClO<SUB>4</SUB>) solutions was studied by spectrophotometry covering a pH range from acidic to alkaline. Over the range of the chloride concentration of 0.05–5 M in acidic solutions, the complexes CuCl<SUB>2</SUB><SUP>−</SUP> and CuCl<SUB>3</SUB><SUP>2−</SUP> were found. The molar extinction coefficients of the complexes were determined at various wavelengths from 220 to 320 nm. The equilibrium constant for the reaction CuCl<SUB>2</SUB><SUP>−</SUP>+Cl<SUP>−</SUP>=CuCl<SUB>3</SUB><SUP>2−</SUP> was determined to be 1.95. Chloro-hydroxo mixed complexes of copper(I), such as CuClOH<SUP>−</SUP>, CuCl<SUB>2</SUB>OH<SUP>2−</SUP>, and CuCl(OH)<SUB>2</SUB><SUP>2−</SUP> were formed in alkaline solutions and the molar extinction coefficients of these species were estimated. The formation constants β<I><SUB>pq</SUB></I>=[CuCl<SUB>2+<I>p</I></SUB>(OH)<I><SUP>q</SUP></I>]/[CuCl<SUB>2</SUB>][Cl]<I><SUP>p</SUP></I>[OH]<I><SUP>q</SUP></I> of the complexes were evaluated to be as follows: β<SUB>−11</SUB>=(1.1±0.1)×10<SUP>4</SUP>,β<SUB>01</SUB>=(4.1±0.3)×10<SUP>3</SUP>, and β<SUB>−12</SUB>=(3.8±0.7)×10<SUP>6</SUP>. No polynuclear complex was formed in the solutions.
- 公益社団法人 日本化学会の論文
著者
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Fujii Ayako
Government Industrial Research Institute
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Sugasaka Kazuhiko
Government Industrial Research Institute