Thermodynamic Study of Mixed-Ligand Complex Formation of Gadolinium(III) Ethylenediaminetetraacetate with Dipeptides in Solution

摘要

The mixed-ligand complex formation in the systems Gd-Edta-L (L = Ser, Cys, GlyGly, AlaAla) has been calorimetrically and pH-potentiometrically studied in aqueous solution at 298.15 K and the ionic strength of I = 0.5 (KNO_3). The full thermodynamic parameters of formation of the GdEdtaL complexes have been determined. The probable coordination mode of the complexone and dipeptide molecules in the mixed-ligand complexes was discussed.