Technetium(VII) and Rhenium(VII) Extraction by a New Diamide Reagent, 2,2&apos;-(Imino)bis(<i>N,N</i>-dialkylacetamide) (IDAA)

Abstract

A new diamide-type extractant, 2,2'-(Imino)bis(N,N-dialkylacetamide) (IDAA), was developed for Tc recovery.IDAA has a nitrogen donor atom introduced into the center of the molecule backbone and the hybrid donor atoms, consisting of two carbonyl oxygen and a nitrogen exhibit the tridentate behavior.

Structural Study on 2,2′-(Methylimino)bis(N,N-Dioctylacetamide) Complex with Re(VII)O4– and Tc(VII)O4– by 1H NMR, EXAFS, and IR Spectroscopy

“…They can be classified under the ammonia-based receptors. On the other hand, 2,2′-(methylimino)bis( N , N -dioctylacetamide) (MIDOA; shown in Figure a) was recently found to be a compatible receptor for Tc(VII)O 4 – in the liquid–liquid extraction. − The MIDOA molecule is obtained by replacing methyl groups with octyl groups in 2,2′-(methylimino)bis( N , N -dimethylacetamide) (MIDMA; shown in Figure b), which is derived from trimethylamine (TMA; Figure c) by replacing terminal hydrogen atoms with amide groups. The MIDOA molecule has a high ability for complexation with the Tc(VII)O 4 – ion; the distribution ratio between the organic and the aqueous phase is >10 3 in various extraction systems …”

A Demonstration Test to Separate Minor Actinides in High-Level Liquid Waste by <i>N,N,N',N',N'',N''</i>-Hexaoctyl Nitrilotriacetamide (HONTA) Using Mixer-Settler Extractors in a Hot Cell

“…However, mutual separation is essential for increasing transmutation efficiency because some lanthanides have large neutron-capture cross-sections. Various extractants and complexing agents were synthesized, and the extraction and separation properties of many metallic elements were investigated [9][10][11]. Based on the investigations, several hydrometallurgical processes were proposed such as TALSPEAK (trivalent actinide-lanthanide separation using phosphorus-reagent extraction from -1 -aqueous complexes) [12], SANEX (selective actinide extraction) [13], i-SANEX (innovative-SANEX) [14],…”

Studies on the Extraction of Soft Acid Metal Species Using MIDOA and Analogous Compounds

“…The extractant, MIDOA (methylimino-bis-N,N'-dioctylacetamide) used mainly here was developed in our group and reported on in 2007 for the first time [12][13]. This compound belongs to the podand-type, which has a structure similar to diglycolamide, with a nitrogen atom introduced into the carbon chain connected the two amide groups.…”