Thermodynamic study of heteroligand complex formation of copper(II) and nickel(II) nitrilotriacetates with amino acids in solution
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.
KeywordsThermodynamic parameters Heteroligand complex Calorimetry Copper (II) nitrilotriacetate Aspartic acid Iminodiacetic acid Arginine Serine Dentate number
We thank A.V. Kulikov from the Institute of Problems of Chemical Physics of the Russian Academy of Science (Chernogolovka) for ESR spectra recording. Appreciation is expressed to V.G. Shtyrlin and M.S. Bukharov from Kazan Federal University for ESR spectra treatment. This work was supported by Russian Foundation for Basic Research (Project No. 14-03-00360-a) and Ministry of Science and Education of Russian Federation (Project No. 526).
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