Molecular design for hybrid donor type ligands with oxygen and nitrogen for simultaneous ion recognition of actinides (III, IV, VI) from lanthanides (III)

Yaita, Tsuyoshi; Kobayashi, Toru ; Shiwaku, Hideaki   ; Okamoto, Yoshihiro  ; Akutsu, Kazuhiro; Suzuki, Shinichi

Hybrid donor type ligand consistent of two aza-aromatic donors and an amide oxygen, N-alkyl-N-phenyl-1,10- phenanthroline-2-carboxamide (PTA) as ion recognition reagents for actinides, was successfully designed and synthesized. This compound presents a quite unique function never seen before, i.e., recognizes actinides (III, IV, VI) from lanthanides (III) in acidic solution. Generally, oxygen donor ligands show strong affinity to all actinides and lanthanides by electrostatic coupling, while nitrogen donor ligands recognize selectively trivalent actinides from lanthanides through covalent interaction. Therefore, this special property of the PTA is attributed to be an integrated compound by the two types of the ligands. In this presentation, mechanism for the recognition of trivalent actinides from lanthanides by syanchrotron based XAS, XES and RIXS will be also discussed.