Determination of Consecutive Formation Constants of Complex Ions from Ion-Transfer Voltammetric Data
- 1 October 1997
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 70 (10) , 2489-2493
- https://doi.org/10.1246/bcsj.70.2489
Abstract
The half-wave potentials of the voltammetric waves of facilitated transfer of Pb2+ ion by 1,4,7,10,13,16-hexathiacyclooctadecane across the nitrobenzene/water interface have been measured as a function of the concentration of free CH3COO− ion in aqueous phase. Using the equation of reversible half-wave ion-transfer potential, the formal formation constants of 1 : 1, 1 : 2, and 1 : 3 Pb2+–CH3COO− complexes in the aqueous medium have been determined to be 102.3 M−1, 103.0 M−2, and 104.0 M−3, respectively. A polynomial regression method for the determination of the formation constants from voltammetric data is presented. Ion-transfer voltammetry at the liquid/liquid interface can be applied advantageously to the determination of consecutive formation constants of metal complexes with a ligand in aqueous media as well as those with an ionophore in organic media.This publication has 11 references indexed in Scilit:
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