4.7 Article

Thermodynamics of citrate complexation with Mn2+, Co2+, Ni2+ and Zn2+ ions

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SPRINGER
DOI: 10.1007/s10973-009-0523-4

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Citrate complexes; Thermodynamic parameters; Isothermal titration calorimetry

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  1. Polish State Committee for Scientific Research [DS/8230-4-0088-9]

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Isothermal titration calorimetry has been used to determine the stoichiometry, formation constants and thermodynamic parameters (Delta G (o), Delta H, Delta S) for the formation of the citrate complexes with the Mn2+, Co2+, Ni2+ and Zn2+ ions. The measurements were run in Cacodylate, Pipes and Mes buffer solutions with a pH of 6, at 298.15 K. A constant ionic strength of 100 mM was maintained with NaClO4. The influence of a metal ion on its interaction energy with the citrate ions and the stability of the resulting complexes have been discussed.

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