Liquid-Liquid Extraction of Strontium With Amido Podands

Stephan, Holger; Gloe, Karsten; Beger, J.; Mühl, P.

doi:10.1080/07366299108918063

Cited by 55 publications

(26 citation statements)

References 35 publications

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“…NpO2~ + C104~a) + 2DMDHOPDA(0) Np02(DMDHOPDA)2(C104)(0) (9) Eberle et al, reported that Np in NpO2+ can have tetracoordination to other donors.20 For the reaction in Eq. (9), we can assume that DMDHOPDA functions as a bidentate ligand.…”

Section: Resultsmentioning

confidence: 99%

Solvent Extraction of Eu, Th, U, Np and Am with N,N’-Dimethyl-N,N’-dihexyl-3-oxapentanediamide and Its Analogous Compounds

1996

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The diamide type extractants (N, DMDHOPDA, N, DHTPDA, and N, DHOPDA) were synthesized and tested for the extraction of the lanthanide and actinide elements. The elements, Eu3+, Am3+, Th4+, NpO2+ and U022+, when extracted by DMDHOPDA, showed no pH-dependence. The relationships between log[DMDHOPDA] and log D under different ionic strengths were investigated in order to clarify the extraction reactions. The separation factor for Eu3+/Am3+ is 8.64. KeywordsSolvent extraction, diamide, actinide element, separationStudy of the solvent extraction of lanthanide and actinide elements using monoamides and diamides has continued over the last 20 years. l-5 Daamides have several advantages in extraction, such as strong complexation and the ability to extract metal ion from low pH solutions. The extraction behavior of lanthanide and actinide elements3'5, the loading capacity of the extraction solvent3, the extraction reaction with water and anions6 and the extent of radiolytic degradation' have been studied for diamides of various structures.Previously, Stephan et al.8'9 and Yao et al.10 designed and synthesized ether type diamides, in which the oxygen or nitrogen is introduced into carbon chain connecting the amide groups. These studies focused on the extraction of divalent9 and trivalent10 metal ions with these diamides.In this research, N, N'-dimethyl-N, N'-dihexyl-3-oxapentanediamide, DMDHOPDA (CH3(CH6H13)NCOCH2-0-CH2CONCH3(C6H13)), and 2 analogous compounds (N, N'-dihexyl-3-thiopentanediamide, DHTPDA, and N, N'-dihexyl-3-oxapentanediamide, DHTPDA) were synthesized. These compounds offer the possibility of two or even three oxygen and/or sulfur donors that can be associated with the metal ion. The extraction of lanthanide and actinide elements was studied to test the separation value achieved by these diamides. The difficulty of separation of analogous 4f and 5f trivalent cations is well known and has attracted many researchers.lo-15 The separation of Eu and Am has been a focus in this study.In Fig. 1, the possible modes of complexation of these cations with the diamide are shown. In mode (A), the metal ion associates with two oxygen atoms of NC=O and NC=O to make an eight-membered ring. In (B) mode, it associates with two oxygen atoms of NC=O and CH2-0-CH2 to make a five-membered ring. While in mode (C), the metal ion associates with 3 oxygen atoms of two NC=O and CH2-0-CH2 to form 2 five-membered rings.

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Section: Resultsmentioning

confidence: 99%

Solvent Extraction of Eu, Th, U, Np and Am with N,N’-Dimethyl-N,N’-dihexyl-3-oxapentanediamide and Its Analogous Compounds

1996

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“…• C 12 The DGAA framework with a tertiary amide group (DODGAA) has a relatively rigid molecular geometry because of the partial double-bond character of the C-N bond of the amide group, which leads to a stronger basicity of the amide oxygen atom [27]. In contrast, the DGAA framework with a secondary amide group (C 12 DGAA) makes the basicity of the amide oxygen atom weaker.…”

Section: Classification Of Metal Ions Based On Extraction Efficiencymentioning

confidence: 99%

A Comprehensive Extraction Study Using a Mono-alkylated Diglycolamic Acid Extractant: Comparison Between a Secondary Amide Group and a Tertiary Amide Group

Sugita

Fujiwara

Okamura

et al. 2017

SERDJ

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The extraction characteristics of N-dodecyldiglycolamic acid (C 12 DGAA), with a secondary amide group, for 56 metal ions have been investigated, and compared with those of N,N-dioctyldiglycolamic acid (DODGAA) with a tertiary amide group. C 12 DGAA is capable of quantitative transfer for a variety of metal ions through a proton-exchange reaction, and the extraction behavior as a function of the aqueous-phase pH is similar for C 12 DGAA and DODGAA. Compared with DODGAA, C 12 DGAA has a poor extraction performance and separation ability for rare-earth metal ions, except for Sc(III). However, C 12 DGAA tended to provide better extraction for relatively small-sized metal ions than DODGAA. In addition, it was found that C 12 DGAA enables the selective removal of Hg(II) from aqueous solutions containing various divalent metal ions (Hg(II), Pb(II), Cu(II), Cd(II), Zn(II), Mn(II), Co(II), and Ni(II)).

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“…We suggest that the -155 -difference in the extraction and separation performances between C 12 DGAA and DODGAA is likely attributable to the difference in the basicity of the amide oxygen atom. As shown in Figure 4, the DGAA framework with a tertiary amide group (DODGAA) has a relatively rigid molecular geometry because of the partial double-bond character of the C-N bond of the amide group, which leads to a stronger basicity of the amide oxygen atom [21]. This enhanced basicity is advantageous for coordinative and electrostatic interactions with metal ions.…”

Section: +mentioning

confidence: 99%

“…In the case of the DGAA framework with a secondary amide group (C 12 DGAA), it is obvious that the basicity of the amide oxygen atom is weaker than that of a tertiary amide oxygen atom. In addition, it is likely that a secondary amide group would form an intramolecular hydrogen bond with carbonyl oxygen or ether oxygen [21].…”

Section: +mentioning

confidence: 99%

Extraction Behavior of Rare-earth Elements Using a Mono-alkylated Diglycolamic Acid Extractant

Shimojo

Fujiwara

Fujisawa

et al. 2016

SERDJ

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Liquid-liquid extraction of rare-earth (RE) cations has been investigated using N-dodecyldiglycolamic acid (C 12 DGAA) with a secondary amide group, and compared with that using N,N-dioctyldiglycolamic acid (DODGAA) with a tertiary amide group. C 12 DGAA enables quantitative transfer of all RE cations from moderately acidic solution, while being selective toward the heavier RE cations, and performs better than typical carboxylic-acid-type extractants. However, C 12 DGAA provides low extraction performance and separation ability for RE cations compared with DODGAA because of the weaker basicity of the amide oxygen. Slope analysis demonstrated that RE 3+ transfer with C 12 DGAA proceeded through a proton-exchange reaction, forming a 1:3 complex, RE(C 12 DGAA) 3 . Structural characterization by X-ray diffraction revealed that three N-butyldiglycolamic acid (C 4 DGAA) molecules coordinated to the La 3+ central ion in a tridentate fashion and the La 3+ primary coordination sphere consisted of three oxygen atoms from the amide group, three oxygen atoms from the ether group, and three oxygen atoms from the carboxy group.

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Liquid-Liquid Extraction of Strontium With Amido Podands

Cited by 55 publications

References 35 publications

Solvent Extraction of Eu, Th, U, Np and Am with N,N’-Dimethyl-N,N’-dihexyl-3-oxapentanediamide and Its Analogous Compounds

Solvent Extraction of Eu, Th, U, Np and Am with N,N’-Dimethyl-N,N’-dihexyl-3-oxapentanediamide and Its Analogous Compounds

A Comprehensive Extraction Study Using a Mono-alkylated Diglycolamic Acid Extractant: Comparison Between a Secondary Amide Group and a Tertiary Amide Group

Extraction Behavior of Rare-earth Elements Using a Mono-alkylated Diglycolamic Acid Extractant

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