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Issue
Korean Journal of Chemical Engineering,
Vol.31, No.1, 109-119, 2014
Equilibrium studies of ternary systems containing some selected transition metal ions, triazoles and aromatic carboxylic acids
Khalil MM, Radalla AE, Qasem F, Khaled R
Solution equilibria of the binary and ternary complex systems of the divalent transition metal ions Cu2+, Ni2+, Zn2+, and Co2+ with 1,2,4-triazole (TRZ), 3-mercapto-1,2,4-triazole (TRZSH), and 3-amino-1,2,4-triazole (TRZAM) and aromatic carboxylic acids (phthalic, anthranilic, salicylic, and 5-sulfosalicylic acid) have been studied pH-metrically at (25.0±0.1) ℃, and a constant ionic strength I=1×10^(-1) mol L^(-1) NaNO3 in an aqueous medium. The potentiometric titration curves show that binary and ternary complexes of these ligands are formed in solution. The stability constants of the different binary and ternary complexes formed were calculated on the basis of computer analysis of the titration data. The relative stability of the different ternary complex species is expressed in terms of Δ log K values, log X and R. S.% parameters. The effect of temperature of the medium on both the proton-ligand equilibria for TRZAM and phthalic acid and their metal-ligand equilibria with Cu2+, Ni2+, and Co2+ has been studied along with the corresponding thermodynamic parameters. The complexation behavior of ternary complexes is ascertained using conductivity measurements. In addition, the formation of ternary complexes in solution has been confirmed by using UV-visible spectrophotometry.
Keywords: Triazoles; Equilibrium Studies; Stability Constants; Binary and Ternary Complexes; Aromatic Carboxylic Acids
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