Abstract
The stability constants of the Co(II), Ni(II), Cu(II) and Zn(II) complexes of serine and threonine were determined pH-metrically at an ionic strength of 0·05 at 20, 25, 30 and 35°C, while those of the α-aminobutyric acid complexes were determined at 25°C. The enthalpy changes of the α-aminobutyric acid complexes were obtained calorimetrically, and those of the serine and threonine complexes were determined both by the temperature coefficient method and calorimetrically. The data obtained by the two procedures agreed quite well with each other. A comparison of the thermodynamic data for the α-alanine and α-aminobutyric acid complexes with those for the serine and threonine chelates permit the conclusion that the non-ionised hydroxyl groups in the latter ligands also participate in complex formation.
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