2,2'-(Methylimino)bis(-dioctylacetamide) (MIDOA), a new tridentate extractant for technetium(VII), rhenium(VII), palladium(II), and plutonium(IV)

Sasaki, Yuji  ; Ozawa, Masaki; Kimura, Takaumi ; Ohashi, Kozaburo*

2,2'-(Methylimino)bis(-dioctylacetamide) (MIDOA) was developed as a new extractant for Tc-extraction. MIDOA has a similar backbone to TODGA, -tetraoctyl-diglycolamimde, the nitrogen atom bonded with methyl group is introduced, instead of ether oxygen in TODGA. MIDOA has a high lipophilic property and is ready to use in the HNO--dodecane extraction system. Tc(VII), Cr(VI), Re(VII), Mo(VI), W(VI), Pd(II) and Pu(IV) are well-extracted by MIDOA. The (Tc) values decrease gradually with HNO, H, and NO concentrations, and log vs. log [MIDOA] relation supports the species extracted to be 1:1 metal-ligand complex. It is clear that MIDDA (2,2'-(Methylimino)bis(-didodecylacetamide)) and IDDA (2,2'-(Imino)bis(-didodecylacetamide)), which show analogous structures with MIDOA, have similar extraction behavior to that of MIDOA.