Abstract
Formation of binary and ternary complexes of lead(II) ions with 1-(aminomethyl) cyclohexane acetic acid and some biologically important α-amino acids, such as glycine, l-alanine, l-valine, l-leucine, l-isoleucine, l-phenylalanine and l-proline was investigated using the potentiometric technique at 32°C. The properties of mixed ligands were investigated and discussed. The acidity constants of the ligands and their stability constants were determined in 50% (v/v) DMSO-water medium under experimental conditions. The ternary complex formation was found to occur in a stepwise manner. The stability of ternary complexes was investigated and compared with that of the corresponding binary complex in terms of the parameters, ΔlogK and logX. The concentration distribution of various species formed in the mixed ligand systems was evaluated.
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