Polarographic Determination of the Formation Constant of Sulfatonickel(II) Complex

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概要

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• A method for the determination of the formation constants of less stable metal complexes has been developed. The method is based on the polarographic measurement of the sum of the equilibrium concentrations of hydrated metal ions and the complexes coordinating with acetate and/or co-existing ions in the presence of an appropriate auxiliary complex-forming substance. Essential advantages of the method are those of the method that was previously reported and applied to the formation constants of acetatonickel(II) complex.<BR>The procedure developed is applied to the study of the nickel (II) complexes present in the acetate buffer solution containing nitrilo-triacetate as an auxiliary complex-forming substance and sulfate as co-existing ions. The results obtained reveal that, under the experimental condition, the monoacetatonickel(II) ions NiOAc<SUP>+</SUP> and the monosulfatonickel(II) NiSO<SUB>4</SUB> are present in the solution but not the acetatosulfatoniccolate(II) Ni(OAc)(SO<SUB>4</SUB>)<SUP>－</SUP>. The formation constants of monosulfato complex, <I>K</I><SUB>NiSO<SUB>4</SUB></SUB>, at ionic strength 0.2 are calculated to be 14.3±0.4 at 15°C, 11.6±0.9 at 25°C and 14.6±0.7 at 35°C.

• 社団法人 日本化学会の論文

著者

• TANAKA N.

  Department of Health And Physical Education, Kyoto Sangyou University

• Ogino Hiroshi

  Department Of Chemistry Faculty Of Science Tohoku University

• Tanaka Nobuyuki

  Department of Chemistry Faculty of Science Tohoku University

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