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Computer Application in PH-Metric Investigation of Ternary Complexes of Ca(II),Mg(II) and Zn(II) with L-Aspartic Acid and Ethylenediaminein Propylene Glycol -Water Mixtures

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-3 Issue-6
	Year of Publication : 2020
	Unique Identification Number : IJSRED-V3I6P85
	Authors : Chandra Leela Athota, Vijaya Kumar Nethala, Rama Swamy Guttula, Nageswara Rao Gollapalli
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Abstract :

The stability constants of ternary complexes of Ca(II), Mg(II) and Zn(II) with L-Aspartic acid as primary ligands and Ethylenediamine as a secondary ligand were determined pH-metrically. The study was accompanied in varying concentrations (0-60% v/v) of propylene glycol-water mixtures at an ionic strength of 0.16 mol L-1 sing NaCl as an electrolyte at 303.0 K. The Value of Δ log K which is responsible for the extra stability of ternary complexes was conferred on the basis of statistical parameters and the nature of the species formed. The formation of various ternary species was established by modeling studies using the computer program MINIQUAD75. The formation and distribution of different species with relative concentrations of metal and ligands (M:L:X = 1.0:2.5:2.5, 1.0:2.5:5.0, 1.0:5.0:2.5) with varying pH were represented in the form of distribution diagrams. Influence of the solvent on the speciation was discussed based on the dielectric constant of the medium. The stability of the mixed ligand complexes are discussed in terms of the molecular structure of L – Aspartic acid and En as well as the nature of the metalion.