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Muñoz, Eva
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article
Simultaneous determination of thermodynamic and kinetic parameters of aminopolycarbonate complexes of cobalt(II) and nickel(II) based on isothermal titration calorimetry data
Abstract
The influence of the different side chain residues on the thermodynamic and kinetic parametersfor complexation reactions of the Co2+and Ni2+ions has been investigated by using the iso-thermal titration calorimetry (ITC) technique supported by potentiometric titration data. Thestudy 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 acidbuffers (0.1 mol L−1, pH 6) at 298.15 K. The quantification of the metal‐buffer interactionsand their incorporation into the ITC data analysis enabled to obtain the pH‐independent andbuffer‐independent thermodynamic parameters (K, ΔG, ΔH, and ΔS) for the reactions understudy. 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 Co2+and Ni2+complexes and their thermodynamic stabil-ities are discussed.