Synthesis and Biological Evaluation of Novel Zn(II) and Cd(II) Schiff Base Complexes as Antimicrobial, Antifungal, and Antioxidant Agents

Table 8

Thermodynamic parameters for the protonation of the ligand (DMPTHP) in 50% DMSO-H₂O (V/V) solution at I = 0.1 mol·dm⁻³ NaNO₃.

Parameter^a	Reaction
	L + H = HL^a			L + 2H = H2L			L + 3H = H3L
	288	293	298	288	293	298	288	293	298
	46.95	47.44	47.85	20.88	20.89	21.06	18.59	18.67	18.88
−ΔH	33.99			17.01			14.47
ΔS	44.99			13.09			14.16

ΔG, Gibbs energy/kJ·mol⁻¹; ΔH, enthalpy/kJ·mol⁻¹; ΔS, entropy/J·mol⁻¹·K⁻¹.