An Additional insight into the correlation between the distribution ratios and the aqueous acidity of the TODGA system

Sasaki, Yuji  ; Rapold, P.*; Arisaka, Makoto ; Hirata, Masaru ; Kimura, Takaumi ; Hill, C.*; Cote, G.*

Extraction of Eu(III) and Am(III) from HNO into the organic solvents using N,N,N',N'-tetraoctyl-diglycolamide (TODGA) was investigated in order to study the detailed extraction reaction. The chemical species: 1:2 for metal:TODGA complex is present in polar diluents. On the other hand, the metal complexes need three or more number of TODGA molecules to remain stable in non-polar diluents. The HNO concentration dependence on the distribution ratio suggests that HNO participates in the metal extraction. Infrared spectra indicate that the carbonyl oxygen coordinates with Eu(III), and luminescence lifetimes suggest that there is no water molecule in the inner coordination sphere of Eu-complex extracted.