Potentiometric and Thermodynamic Studies of Some Schiff-Base Derivatives of 4-Aminoantipyrine and Their Metal Complexes

Table 1

Thermodynamic functions for the dissociation of ligand (L₁) in 10% (by volume) ethanol-water mixture and 0.1 mol · dm⁻³ KCl at different temperatures.

	Dissociation	Gibbs energy	Enthalpy	Entropy
𝑇/K	constant	kJ⋅mol^−1	kJ⋅mol^−1	J⋅mol^−1⋅K^−1
	pK^H	Δ𝐺1	Δ𝐻1	−Δ𝑆1
298	9.25 (0.10)	52.77		70.56
308	9.07 (0.09)	53.48	31.75	70.57
318	8.90 (0.09)	54.19		70.56

Standard deviations are given in parentheses.