Lanthanide extraction selectivity of a tripodal carbamoylmethylphosphine oxide ligand system

Two Beta-Phosphorylamide Compounds as Ligands for Sm3+, Eu3+, and Tb3+: X-ray Crystallography and Luminescence Properties

This paper describes the synthesis of two beta-phosphorylamide ligands and their coordination chemistry with the Ln ions Tb³⁺, Eu³⁺, and Sm³⁺. Both the ligands and Ln complexes were characterized by IR, NMR, MS, and X-ray crystallography. The luminescence properties of the Tb³⁺ and Eu³⁺ complexes were also characterized, including the acquisition of lifetime decay curves. In the solid state, the Tb³⁺ and Sm³⁺ ligand complexes were found to have a 2:2 stoichiometry when analyzed by X-ray diffraction. In these structures, the Ln ion was bound by both oxygen atoms of each beta-phosphorylamide moiety of the ligands. The Tb³⁺ and Eu³⁺ complexes were modestly emissive as solutions in acetonitrile, with lifetime values that fell within typical ranges.

Supramolecular ligands for the extraction of lanthanide and actinide ions

A selection of supramolecular ligands designed to extract f-elements.