Simultaneous determination of thermodynamic and kinetic parameters of aminopolycarbonate complexes of cobalt(II) and nickel(II) based on isothermal titration calorimetry data
Aleksandra Tesmar , Dariusz Wyrzykowski , Eva Muñoz , Bogusław Pilarski , Joanna Pranczk , Dagmara Jacewicz , Lech Chmurzyński
AbstractThe influence of the different side chain residues on the thermodynamic and kinetic parameters for complexation reactions of the Co 2+ and Ni 2+ ions has been investigated by using the iso- thermal titration calorimetry (ITC) technique supported by potentiometric titration data. The study was concerned with the 2 common tripodal aminocarboxylate ligands, namely, nitrilotriacetic acid and N‐(2‐hydroxyethyl) iminodiacetic acid. Calorimetric measurements (ITC) were run in the 2‐(N‐morpholino)ethanesulfonic acid hydrate (2‐(N‐morpholino) ethanesulfonic acid), piperazine‐N,N′‐bis(2‐ethanesulfonic acid), and dimethylarsenic acid buffers (0.1 mol L −1 , pH 6) at 298.15 K. The quantification of the metal‐buffer interactions and their incorporation into the ITC data analysis enabled to obtain the pH‐independent and buffer‐independent thermodynamic parameters (K, ΔG, ΔH, and ΔS) for the reactions under study. Furthermore, the kinITC method was applied to obtain kinetic information on complex- ation reactions from the ITC data. Correlations, based on kinetic and thermodynamic data, between the kinetics of formation of Co 2+ and Ni 2+ complexes and their thermodynamic stabil- ities are discussed.
|Journal series||Journal of Molecular Recognition, ISSN 0952-3499|
|Publication size in sheets||0.5|
|Keywords in English||buffer, Co(II) and Ni(II) complexes, competitive binding, isothermal titration calorimetry, kinITC method, thermodynamic parameters|
|Score|| = 25.0, 20-12-2017, ArticleFromJournal|
= 25.0, 20-12-2017, ArticleFromJournal
|Publication indicators||: 2016 = 2.175 (2) - 2016=2.051 (5)|
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