Abstract
The aqueous complexation reactions of trivalent lanthanide and actinide cations with the hexadentate ligand N, N, N′, N′-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) have been characterized using potentiometric and spectroscopic techniques in 0.1 M NaClO 4. At 25°C, the stability constant of Am(TPEN) 3+ is two orders of magnitude larger than that of Sm(TPEN) 3+, reflecting the stronger interactions of the trivalent actinide cations with softer ligands as compared to lanthanide cations.
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