A Polarographic Study of the Zinc(II)Ethylenediamine-<I>N</I>,<I>N</I>′diacetate (EDDA) and –Triethylenetetraamine (Trien) Complexes
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Zinc(II)–EDDA and –Trien complexes produced kinetic waves. By conducting a systematic examination of the nature of the kinetic waves, the reaction mechanisms and the rates of the rate-determining step were determined. The kinetic wave of the zinc(II)–EDDA complex could be ascribed to the reduction of the zinc(II) aquo ion formed upon its slow dissociation at the electrode surface. From a comparison of the observed rate constant with that estimated on the basis of the proposed reaction intermediate, the dissociation of the zinc(II)–EDDA complex was found to proceed through a reaction intermediate in which the leaving EDDA anion is bonded to the zinc(II) ion through the ethylenediamine chelate ring. In the case of the Trien complex, the kinetic wave could be ascirbed to the reduction of the zinc(II)–Trien complex formed upon the slow configurational change of the tetrahedral zinc(II)–Trien complex at the electrode surface.
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