Study of Binary Complexes of Cu(II), Ni(II) and Co(II)
with Sulfamethazine by Voltammetry¹

I. Bulut^z and E. Biçer

Ondokuz Mayis University, Faculty of Arts and Sciences, Department of Chemistry, Kurupelit-Samsun, 55139 Turkey

Received December 24, 2008

Abstract—Cyclic voltammetry (CV) and square-wave voltammetry (SWV) techniques have been used to study
the binary complexes of Co(II), Ni(II) and Cu(II) with sulfamethazine (SMZ) at a static mercury drop electrode
(SMDE) in 0.04 M Britton–Robinson (B–R) buffer. SMZ gave three peaks at 0.01, –1.32 and –1.55 V. Cu(II)-SMZ
complex was recognized by a cathodic peak at –0.38 V. Ni(II)-SMZ complex was reduced at more positive poten-
tial (–0.77 V) than that of the hydrated Ni(II) ions (–1.08 V). Co(II)-SMZ complex is investigated at pH 7 and 8.
The Co(II) complex at pH 7 is appeared as a shoulder at –1.19 V, whereas this peak becomes a well-separated form
at pH 8. The study indicated that the SMZ serves as a catalyst in the reduction of Co(II) and Ni(II) ions. From
electronic spectra data of the complexes, their stoichiometries of 1 : 2 (metal-ligand) in aqueous medium are deter-
mined. The stability constants of the complexes are in agreement with the Irwing-Williams series (Co < Ni < Cu).

Key words: metal(II) complexes, sulfamethazine, voltammetry, interaction, catalytic effect

DOI: 10.1134/S1023193510010076

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