Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Polarographic Study of the Substitution Reactions between Nickel(II) Ions and Copper(II) Chelates of Triethylenetetraminehexaacetic Acid
Md. Shamsul HaqueMiloslav Kopanica
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1973 Volume 46 Issue 10 Pages 3072-3076


The mechanism of substitution reaction between nickel ion and Cu–TTHA chelate was studied by polarographic technique. During the study of the substitution reaction the existence of mixed binuclear chelate CuXNi2− was verified and the value of the stability constant was calculated on the basis of polarographic data. Formation of the mixed binuclear chelate was further verified by the amperometric tit ration of the equimolar mixture of both metal ions with TTHA. Finally the existence of mixed binuclear chelate CuXNi2− was verified by potentiometric titration method. When nickel is present in large excess the replacement of Cu2+ ions from Cu2X2− occurred directly without formation of intermediate mixed binuclear chelate. The stability constant of Cu2X2− was calculated from equilibrium study.

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