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International Journal of Electrochemistry
Volume 2013 (2013), Article ID 257926, 7 pages
http://dx.doi.org/10.1155/2013/257926
Research Article

Electrochemical Behavior of Ni(II)-Salen at the Mercury Electrode

Department of Chemistry, Pontifícia Universidade Católica, Rua Marques de São Vicente 225, 22453-900 Rio de Janeiro, RJ, Brazil

Received 4 February 2013; Revised 26 March 2013; Accepted 1 April 2013

Academic Editor: Angela Molina

Copyright © 2013 Pércio Augusto Mardini Farias and Margarida Bethlem Rodrigues Bastos. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The complex Ni(II)-salen has been studied using cyclic and square-wave cathodic stripping voltammetry at the static mercury drop electrode in an aqueous media of phosphate and Hepes buffers (at pH 7.0). The resulting voltammograms consist of a totally irreversible one-electron transfer attributable to the coupling of Ni(II) salen/Ni(I) salen via an EC mechanism. The mean value for the transfer coefficient α in both supporting electrolytes was calculated as 0.35 ± 0.05. The amount of reactant adsorbed after 60 s of accumulation at −700 mV was calculated to be 2.8 × 10−8 mol·cm−2. The detection limit for nickel determination was found to be 3.4 × 10−9 mol L−1.