The proton-ligand formation constant of N-methylisatin-β-amidinohydrazone (β-MIAG) and the metal-ligand formation constant of its complexes with UO2(II), Cu(II), Ni(II), Co(II), Pb(II), Zn(II), Cd(II) and Mn(II) have been determined at a definite ionic strength, μ = 0.1 M NaCIO4, and at temperature 30±0.5°C, in aqueous organic solvents of different compositions. The variance ofpKa and logβn with the inverse of the dielectric constant or the mole fraction of the solvent has also been studied. ThepKa and logβn increases with the decrease of dielectric constant and the increase of the mole fraction of organic solvent of the media. In all the systems, the order of logβn values of M(II)-β-MIAG chelates is in accordance with Irving-William’s series.
Volume 134, 2022
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