Authors: D Wyrzykowski D Zarzeczańska D Jacewicz L Chmurzyński
Publish Date: 2011/03/04
Volume: 105, Issue: 3, Pages: 1043-1047
Abstract
Isothermal titration calorimetry ITC and potentiometric titration methods have been used to study the process of proton transfer in the copperII ionglycylglycine reaction The stoichiometry conditional stability constants and thermodynamic parameters ΔG ΔH and ΔS for the complexation reaction were determined using the ITC method The measurements were carried out at 29815 K in solutions with a pH of 6 and the ionic strength maintained with 100 mM NaClO4 Carrying out the measurements in buffer solutions of equal pH but different enthalpies of ionization of its components Mes Pipes Cacodylate enabled determination of the enthalpy of complex formation independent of the enthalpy of buffer ionization The number of protons released by glycylglycine on account of complexation of the copperII ions was determined from calorimetric and potentiometric measurements
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