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Acid-base equilibria of Zn(II) and Fe(III) complexes with N',N'2-bis-[(1E)-1-(2-pyridyl)ethylidene]ethanedihydrazide (ligand L1) and N',N'2-bis[(1E)-- 1-(2-pyridyl)ethylidene]propanedihydrazide (ligand L2), i.e., [Fe(L1)Cl 2 (H 2 O)], [Fe(L2)Cl(H 2 O)] 2+ , [Zn(L1)(H 2 O) 3 ] + and [Zn(L2)(H 2 O) 2 ] 2+ , which expressed cytotoxic activity, were investigated in aqueous media. The equilibrium constants were determined potentiometrically at 25 °C at a constant ionic strength of 0.10 mol/dm 3 (Na 2 SO 4 ). The results showed that at pH < 8 both the Fe(III) complexes studied here have three, while [Zn(L1)(H 2 O) 3 ] + and [Zn(L2)(H 2 O) 2 ] 2+ have one and two titratable protons, respectively. Based on the obtained values for the equilibrium constants, protonation schemes of the examined complexes are proposed.

Acid-base equilibria of the Zn(II) and Fe(III) complexes with condensation products of 2-acetylpyridine and the dihydrazide of oxalic and malonic acid