Electrochemical Behavior of Copper(II) salen in Aqueous Phosphate Buffer at the Mercury Electrode

The electrochemical behavior of copper(II) complexed with the Schiff base N,N´-ethylenebis(salicylidenimine) in aqueous phosphate (pH 7.0) was studied by polarographic and voltammetric techniques (DC, DPP, DPV, CV, and SWV) at a mercury electrode. The resulting polarograms and voltammograms consist...

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Bibliographic Details
Published in:International journal of electrochemical science 2009-03, Vol.4 (3), p.458-470
Main Authors: Mardini Farias, Percio Augusto, Rodrigues Bastos, Margarida Bethlem
Format: Article
Language:English
Subjects:
copper
polarography and voltammetry
salen
Schiff base
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Summary:The electrochemical behavior of copper(II) complexed with the Schiff base N,N´-ethylenebis(salicylidenimine) in aqueous phosphate (pH 7.0) was studied by polarographic and voltammetric techniques (DC, DPP, DPV, CV, and SWV) at a mercury electrode. The resulting polarograms and voltammograms consist of a single quasi-reversible one-electron transfer attributable to the coupling of Cu(II)salen/Cu(I) salen via an EC mechanism. In differential pulse adsorptive stripping voltammetry (DPV) the response of the Cu(II) salen complex is linear over the concentration range 0 to 3.2 x 10-7 mol.L-1. For an accumulation time of 30 seconds, the detection limit was found to be 1.0 x 10-8 mol L-1. Square-wave (SWV) and cyclic voltammetric (CV) measurements indicated that the Cu(II)-salen complex and its reduction product adsorb at the electrode surface.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)15156-X