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

Table 2

Thermodynamic functions for the dissociation of ligand (L₂) in 10% (by volume) ethanol-water mixture and 0.1 mol · dm⁻³ KCl at different temperatures.

𝑇/K	Dissociation; constant	Gibbs energy; kJ⋅mol^−1	Enthalpy; kJ⋅mol^−1	Entropy; J⋅mol^−1⋅K^−1
	pK^H	Δ𝐺1	Δ𝐻1	−Δ𝑆1
298	4.26 (0.09)	24.31		24.92
308	4.09 (0.09)	24.12	31.73	24.72
318	3.91 (0.08)	23.81		24.92

Standard deviations are given in parentheses.