Abstract
The formation of ternary complexes of the Cu(II), Co(II), Ni(II), and Zn(II) metal ions with some hydroxamic acids (acetohydroxamic acid, Aha; benzohydroxamic acid, Bha; salicylhydroxamic acid, Sham; and N-phenylbenzohydroxamic acid, N-PhBha) and some bioligands (α-alanine, α-ala; l-valine, l-val; norvaline, norval; aspartic acid, aspart; glutamic acid, glut; asparagines, asperg; histamine, Him; and imidazole, imid) was investigated using the potentiometric technique at 25 °C and I = 0.10 mol·dm−3 NaNO3. The stability constants of these ternary systems were calculated. The order of stability of the ternary complexes in terms of the nature of metal ions, hydroxamic acids, and bioligands was investigated and discussed as well as the values of Δ log K and log X for the ternary systems. The concentration distribution curves of the various binary and ternary complex species in solution were evaluated. The effect of temperature of the medium on both the ionization process of Aha, Sham, aspart, and glut and the ...
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