Thermodynamic study of heteroligand complex formation of copper(II) and nickel(II) nitrilotriacetates with amino acids in solution

摘要

Ternary complexes of copper(II) and nickel(II) nitrilotriacetate (MNta) with arginine (Arg), serine (Ser), glycine (Gly), aspartic acid (Asp), and iminodiacetic acid (Ida) have been calorimetrically, potentiometrically, and spectrophotometrically studied in aqueous solution at 298.15 K and ionic strength 0.5 (KNO3). The thermodynamic parameters of mixed-ligand complex formation have been determined. The probable coordination modes of amino acid residues in the heteroligand complexes were discussed.