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- W2765463990 abstract "A COMPARATIVE STUDY OF THE COMPLEXATION OF URANIUM(VI) WITH OXYDIACETIC ACID AND ITS AMIDE DERIVATIVES Linfeng Rao and Guoxin Tian Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA. E-mail: lrao@lbl.gov 1 INTRODUCTION There has been significant interest in recent years in the studies of alkyl-substituted amides as extractants for actinide separation because the products of radiolytic and hydrolytic degradation of amides are less detrimental to separation processes than those of organophosphorus compounds traditionally used in actinide separations. Stripping of actinides from the amide-containing organic solvents is relatively easy. In addition, the amide ligands are completely incinerable so that the amount of secondary wastes generated in nuclear waste treatment could be significantly reduced. One group of alkyl-substituted oxa-diamides have been shown to be promising in the separation of actinides from nuclear wastes. 1-3 For example, tetraoctyl-3-oxa-glutaramide 1 and tetraisobutyl-oxa-glutaramide 3 form actinide complexes that can be effectively extracted from nitric acid solutions. To understand the thermodynamic principles governing the complexation of actinides with oxa-diamides, we have studied the complexation of U(VI) with dimethyl-3-oxa-glutaramic acid (DMOGA) and tetramethyl-3- oxa-glutaramide (TMOGA) in aqueous solutions, in comparison with oxydiacetic acid (ODA) (Figure 1). Previous studies have indicated that the complexation of U(VI) with ODA is strong and entropy-driven. 4-6 Comparing the results for DMOGA and TMOGA with those for ODA could provide insight into the energetics of amide complexation with U(VI) and the relationship between the thermodynamic properties and the ligand structure. O C OH HO O O CH 3 H 3 C C N CH 3 O O C N CH 3 CH 3 O C HO O O C O C N CH 3 (a) Figure 1 (b) (c) (a) Oxydiacetic acid (ODA); (b) dimethyl-3-oxa-glutaramic acid (DMOGA); (c) tetramethyl-3-oxa-glutaramide (TMOGA)." @default.
- W2765463990 created "2017-11-10" @default.
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- W2765463990 date "2005-05-01" @default.
- W2765463990 modified "2023-09-23" @default.
- W2765463990 title "A comparative study of the complexation of uranium(VI) with oxydiacetic acid and its amide derivatives - eScholarship" @default.
- W2765463990 hasPublicationYear "2005" @default.
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