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In this report, the interaction of monoamide/diamide and monoamide/diglycolamide mixtures with    $${\text{UO}}_{2}^{2 + }$$    UO   2    2  +are investigated in pH = 1 methanolic nitric acid media. These monoamides include  N , N -dimethylacetamide (DMAA),  N , N -diethylacetamide (DEAA),  N , N -dibutylacetamide (DBAA) and  N , N -dibutylbutanamide (DBBA).  N , N , N ′ N ′-tetraethylmalonamide (TEMA) and  N , N , N ′, N ′-tetraethyldiglycolamide (TEDGA), which were chosen as model diamides and diglycolamides, respectively. Complex stability constants for each ligand were modelled using the Stability Quotients Using Absorbance Data program using UV–visible data. Complex stoichiometry of ligand mixtures was determined using Job plots and UV–Vis spectrometry. Monoamides were confirmed to produce only disolvate complexes with    $${\text{UO}}_{2}^{2 + }$$    UO   2    2  +in solution. The log 10 ( K ) values for monoamides were found to be independent of amine-side chain length, but were slightly dependent on the carbonyl-side chain length. TEDGA was found to produce multiple uranyl complexes in solution. Job plot data indicated that the uranyl cation strongly prefers to bond either only with the monoamide or diamide in ternary monoamide–diamide–UO 2  systems. Monoamide–diglycolamide–UO 2  systems were more complicated, with Job plot data indicating the potential for multiple ternary species being present is dependent on the monoamide structure.

Spectrophotometric Analysis of Ternary Uranyl Systems to Replace Tri-N-butyl Phosphate (TBP) in Used Fuel Reprocessing