Abstract
The values of the free energy, enthalpy and entropy of complexation are reported for a series of aminocarboxylate ligands. For all the systems, a region of “compensation” between ΔH1, and ΔS1 exists between Nd(III) and Ho(III) which is related to dehydration effects. The entropies are a function of the number of ligand carboxylate groups coordinated. Correction of the enthalpy for the coordination of the carboxylate groups gives a residual enthalpy which is a linear function of the basicity of the nitrogen groups. In the HEDTA complexes, the data are consistent with outer sphere coordination of the alcohol group in the light lanthanides and with inner sphere coordination in the heavy members.
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