Thermodynamics of Mixed-Ligand Nickel(II) Complex Formation with Ornithine and Histidine in Aqueous Solutions

The formation of various mixed-ligand complexes in the Ni(II)–L-histidine (His)–L-ornithine (Orn) system was studied by potentiometric titration, calorimetry, and spectrophotometry. The thermodynamic parameters (log K , Δ r G 0 , Δ r H , and Δ r S ) of complex formation reactions at 298.15 K and ion...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2021-10, Vol.66 (10), p.1569-1576
Main Authors: Nikitina, M. G., Pyreu, D. F.
Format: Article
Language:English
Subjects:
Amino acids
Aqueous solutions
Chemistry
Chemistry and Materials Science
Complex formation
Coordination compounds
Histidine
Inorganic Chemistry
Ligands
Nickel
Parameters
Physical Chemistry of Solutions
Spectrophotometry
Titration
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Summary:The formation of various mixed-ligand complexes in the Ni(II)–L-histidine (His)–L-ornithine (Orn) system was studied by potentiometric titration, calorimetry, and spectrophotometry. The thermodynamic parameters (log K , Δ r G 0 , Δ r H , and Δ r S ) of complex formation reactions at 298.15 K and ionic strength I = 0.5 (KNO 3 ) were determined. A comparative analysis of the thermodynamic parameters served as the basis to suggest the most likely coordination mode of amino acid moieties in mixed-ligand complexes.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023621100120