Study on Stabilization Effect of Neutral Soft Donor on Trivalent Lanthanide and Actinide Dicarboxylate Complexes by Time-Resolved Laser-Induced Fluorescence Spectroscopy

Abstract

Stability constants for trivalent f-elements of Eu, Am, and Cm with dicarboxylates containing neutral donors such as secondary amine and ether oxygen were determined by the solvent extraction method in 0.1 M NaClO₄ at 25°C. Six carboxylic acids of suberic acid, 3, 6-dioxaoctanedioic acid, ethylenediamine-N, N'-diacetic acid, glutaric acid, diglycolic acid, and iminodiacetic acid were examined for a systematic comparison. The hydration number of Eu³⁺ in the 1:2 complex was also determined by time resolved laser-induced fluorescence spectroscopy. The role of the softdonor atoms in the complex formation of f-elements and the impact of multiple softdonor atoms on An/Ln selectivity are discussed.