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Thermodynamic Studies On Metal Complexes Of Cd2+, Ni2+, Cu2+ And Co2+ With Pyridine-2,6-Dicarboxylic Acid In Water, Methanol And Water-Methanol Binary Solvent Systems At 298.15, 308.15 And 318.15 K By Conductometric Method

Khushbu K. Mehta, Raviprakash S. Chandra, Dhruvi R. Mehta, M. M. Maisuria
2018 Zenodo  
Stability constants are measured for complexes of Cd2+, Ni2+, Cu2+ and Co2+ with pyridine-2,6-dicarboxylic acid(PDA) in water, methanol and water-methanol binary solvent systems at 298.15, 308.15 and 318.15 K by conductometric method. The result shows that the stoichiometry of the complexes of PDA with all metals in all binary solvent systems is 1:2 [ML2]. The logKf values of PDA-M2+ complexes in H2O-MeOH binary solvent systems increase with increasing % of MeOH and temperature. The ΔH0 and ΔS0
more » ... re. The ΔH0 and ΔS0 of the complexation reaction in the different H2O-MeOH binary solvent systems were evaluated by the temperature dependence of the formation constants using a linear least square analysis according to van't Hoff equation.
doi:10.5281/zenodo.1475326 fatcat:4fzjfkeymrcyrcicqkkmfr7myu