Study of Complex Formation Constants for Some Cations With O-Phenylenediamine in Binary Systems Using Square Wave Polarography Technique
Azizollah Nezhadali, Hanieh Sharifi
DOI: 10.4236/eng.2010.212129   PDF    HTML     6,364 Downloads   11,839 Views   Citations


The formation of metal cation complexes between o-phenylenediamine with metal ions, Ni2+, Cu2+, Zn2+, Pb2+ and Cr3+ were studied in the dimethylformamide/water(DMF/H2O), acetonitrile/water(AN/H2O) and ethanol/water(EtOH/H2O) binary systems using square wave polarography (SWP) technique. The stoichiometry and stability of the complexes were determined by monitoring the shifts in half-waves or peak potentials of the polarographic waves of metal ions against the ligand concentration. In the most cases, the formation constants of complexes decreased with increasing amounts of H2O, DMF and EtOH in AN/H2O, DMF/H2O and EtOH/H2O binary systems, respectively. The stoichiometry of the complexes was found 1:1. The results obtained show that there is an inverse relationship between the formation constant of the complexes and the donor number of the solvents based on the Gatmann donocity scale. Also, the stability constants show a high sensitivity to the composition of the mixed solvent systems. In most of the systems investigated, Cr3+ cation forms a more stable complex with o-phenylenediamine than other four cations and the order of selectivity of this ligand for cations in pure water is:Cr3+>>Cu2+>Ni2+>Zn2+>Pb2+.

Share and Cite:

A. Nezhadali and H. Sharifi, "Study of Complex Formation Constants for Some Cations With O-Phenylenediamine in Binary Systems Using Square Wave Polarography Technique," Engineering, Vol. 2 No. 12, 2010, pp. 1026-1030. doi: 10.4236/eng.2010.212129.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] P. Arthur and H. Lyons, “Use of Asymmetrically Polarized Dropping-Mercury Electrodes in Controlled-Potential Polaro-graphy,” Analytical Chemistry. Vol. 24, No. 4, 1952, pp. 1422-1428..
[2] I. M. Kolthoff, and J. F. Coetzee, “Electro-chemical Reduction of Americium and Some Rare Earth Ele-ments in Acetonitril,” Journal of American Chemical Society, Vol. 79,No. 20, 1957, pp. 1852-1859.
[3] R. S. Pandey, and S. Dugar, “Thermodynamics Studies of Zinc Ethylenediamine Complexes in Aqueous-non-aqueous Media by Polarography,” Asian Journal of Experimental Sciences, Vol. 15, No. 1-2, 2001, pp. 49-62.
[4] D.K. Sharma, S. Kumar, C. Chauhan and A. Gupta, “A Pulse Polarographic Method for the Analysis of Zinc dithiocarbamates,” Indian Journal of Chemistry, Vol. 46, No. 7, 2007, pp. 1121-1124.
[5] E.-S. M. Mabrouk, H. M. Killa, et al., “Polarographic and Cyclic Voltammetric Behaviour of Some Azo Compounds Derived from Sulfonamide in DMF-Aqueous Solutions,” Collection of Czechoslovak Chemical Communications, Vol. 57, No 2, 1992, pp. 268-275.
[6] J. Rzeszotarska, P. Ranachowski and M. K. Kalinowski, “Donor Numbers for Binary Mixtures of Dimethyl Sulfoxide with Dipolar Aprotic Solvents,” Collection of Czechoslovak Chemical Communications, Vol. 59, No. 10, 1994, pp. 2201-2208.
[7] N. G. Tsierkezos, J. Roithova, D. Schr?der, I. E. Molinou and H. Schwarz, “Solvation of Copper(II) Sulfate in Binary Water/N,N-Dimethylformamide Mixtures: From the Solution to the Gas Phase,” The Journal of Physical Chemistry B, Vol. 10, No. 112, 2008, pp. 4365-4371.
[8] G. H. Rounaghi, Z. Eshagi and E. Ghiamati, “Study of the Complex Formation Between 18C6 Crown Ether and Tl+, Pb2+ and Cd2+ in Binary Non-aqueous Solvents Using Differential Pulse Polarography,” Talanta., Vol. 43, No. 7, 1996, pp. 1043-1048.
[9] G. H. Rounaghi, G. N. Gerey and M.S. Kazemi, “A Conductometric Study of Complexation Reactions Between Dibenzo-18-Crown-6 (DB18C6) with Cu2+, Zn2+, Tl+ and Cd2+ Metal Cations in Dimethylsulfoxide-Ethylacetate Binary Mixtures,” Journal of Inclusion Phenomena and Macrocyclic Chemistry, Vol. 56, No. 1, 2006, pp. 167-172.
[10] A. Nezhadali, P. Langara and H. A. Hosseini, “Study of Complex Formation Between Iodoquinol (IQ) and Co2+, Mn2+, Pb2+, Cd2+ and Zn2+ Cations in Binary Aqueous-/Non-aqueous Solvent Using Spectrophotometry,” Electronic Journal of Chemistry, Vol. 4, No. 4, 2007, pp. 581-586.
[11] A. Nezhadali, P. Langara and H. A. Hosseini, “Study of Complex Formation Between 5,7-Diiodo-8-hydroxy-quinoline and Zn2+, Cd2+, Pb2+ and Tl+ Cations in Binary Non-Aqueous Solvents Using Squre Wave Polarography Technique (SWP),” Journal of Chinese Chem-ical Society, Vol. 55, 2008, pp. 271-275.
[12] H. A. Azab, “Polarographic study of composition and stability constants of Pb(II) N-(2-acetamido) imino diacetate complexes,” Journal of Monatshefte für Chemie/Chemical Monthly, Vol.123, No. 12, 2004, pp.1107-1115.
[13] A. Nezhadali, G. H. Rounaghi and M. Chamsaz, “Stoichimetry and Stability of Complexes Formed between 18-Crown-6 as well as Dibenzo-18-Crown-6 Ligands and a Few Metal Ions in Some Non-aqueous Binary Systems Using Square Wave Polarography,” Bulletin of Korean Chemical Society, Vol. 21, No. 7, 2000, pp. 685-689.
[14] T. ?aykara, R. ?nam, Z. ?ztürk and O. Güven, “Determination of the Omplex Formation Constants for Some Water-soluble Polymers with Trivalent Metal ions by Differential Pulse Polarography,” Polymer Science, Vol. 282, No. 7, 2004, pp. 1282-1285.
[15] G. H. Rounaghi, M. Chamsaz and and A. Nezhadali, “A Polarographic Study Tl+, Pb2+ and Cd2+ Complexes with Azo-18-crown-6 and Dibenzopyridi-no-18-crown-6 in Some Binary mixed Non-aqueous Solvents,” Journal of Inclusion Phenomena and Macrocyclic Chemistry, Vol. 38, No. 1, 2000, pp. 153-161.
[16] B. S. Bairwa, M. Goy-al, I. K. Sharma, S. Varshney and P. S. Verma, “Electrochemical Behaviour of Ni(II) Lamino Acid in Aqueous Dimethyl-formamide,Nmethylfor-mamide and Formamide Media at Dme,” Indian Journal of Chemistry, Vol. 46, No. 10, 2007, pp. 778-782.
[17] J. N. Gaur, and N. K. Goswami, “Kinetics of the Reduction of Mn2+ at the Dropping Mercury Electrode in Non-aqueous Media,” Electrochimica Acta. Vol. 12, No. 11, 1967, pp. 1489-1493.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.