The association constants and Gibbs free energies of association are calculated from the conductometric titration curve of CuSO4, NiSO4 with ligand H2IH, (E)-3-(2-benzylidene hydrazinyl)-3-oxo-N-(thiazol-2-yl) propanehydrazide in ethanol solutions at 294.15K. The conductometric titration of CuSO4 and NiSO4 as titrant against the ligand (N'-(2-hydroxy-3H-indol-3-ylidene)-3-oxo-3-(thiazol-2-ylamino) propanehydrazide) in absolute ethanol as solvent at 294.15 K was constructed to evaluate the Gibbs free energies involving the different association constants. From the relation between molar conductivity and the molar ratio [L]/[M], various straight lines are gained detecting that the production of metal complexes with two stiochiometric which are 2:1 and 1:1 [L]/[M]. Gibbs free energies involving the formation constants for each stiochiometric type of complexes were calculated and their values were discussed. Preparation of new ligand is necessary for estimation and physicochemical studies of some transition metal ions like copper and nickel ions in absolute ethanol solutions. Many biological applications for copper and nickel salts are needed; therefore their estimation and conductometric studies were selected.
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K. M. Ibrahim, Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[2]
E. A. Gomaa, Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[3]
R. R. Zaki, Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[4]
M. Nabil Abd El-Hadi, Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Association, Complex Formation, Copper Sulfate, Nickel Sulfate, Propanehydrazide, Ethanol
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