The estimation of the stability or formation constants characterizing the equilibria corresponding to the successive addition of ligands provides a quantitative indication of a complex formation. The technique of paper ionophoresis is used to investigate equilibria in binary complex systems in solution. This method is based on the movement of a spot of metal ion in an electric field at various pH of background electrolyte. A graph of pH versus mobility was used to obtain information on the binary complexes and to calculate its stability constants. At an ionic strength of 0.1 M and 35ºC, the stability constants of ML and ML2 complex species of certain metal ions copper(II), manganese(II), and uranyl(II) with – α- Aminobutenoic acid and hydroxyproline were determined. The stability constants of ML and ML2 complex species of metal(II)-α-aminobutenoic acid and metal(II)– hydroxyproline were found to be [(7.70 ± 0.03, 6.38 ± 0.11), (3.19 ± 0.02, 2.07 ± 0.09), (7.32 ± 0.05, 5.49 ± 0.12)] and [(8.23 ± 0.05, 7.05 ± 0.03), (3.74 ± 0.06, 3.15 ± 0.09), (7.39 ± 0.11, 6.67 ± 0.02)] for copper(II), manganese(II) and uranyl(II) complexes, respectively. The electrophoretic technique described in this paper has proven to be useful in determining whether a complex system is formed or not, and if it is formed, its stability constants can also be determined.
Author (S) Details
Prof. Dr. Brij Bhushan Tewari
Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P.O. Box 101110, Georgetown, Guyana.
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