Cyclic Voltammetric Study of the Redox Behavior
of Fe(II)/Fe(III) Systems Forming During the Oxidation
of Fe(II) Complexes with Saccharin and with Saccharin
and 1,10-Phenanthroline¹

H. M. Naseem Akhtar, A. A. Shaikh, and M. Q. Ehsan

Department of Chemistry, University of Dhaka, Dhaka–1000, Bangladesh

Received March 21, 2007

Abstract—The electrochemical redox behavior of Fe(II)/Fe(III) systems formed during the oxidation of com-
plexes [Fe(C₇H₄NO₃S)₂(H₂O)₄] ·2H₂O (Fe-sac) and [Fe(C₇H₄NO₃S)₂(C₁₂H₈N₂] · 2H₂O (Fe-sac-phen) have been
investigated using cyclic voltammetry in the aqueous medium. In the CVs one pair of well-defined cathodic and
anodic peaks appear for the transfer of single electron in the Fe-sac complex. The peak potentials are much
wider separated as compared with the free (uncoordinated) Fe(II)/Fe(III) system. The E values demonstrate
that the electrode process is irreversible. In the presence of secondary ligand, 1,10-phenanthroline (Fe-sac-phen
complex), the redox behavior of iron complexes is quasireversible. The effect of pH on the redox behavior of
iron system is studied in acetate buffer.

Key words: saccharin, 1,10-phenanthroline, iron(II), iron(III), complex, cyclic voltammetry, electrode kinetics

DOI: 10.1134/S102319350812015X

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