Aqueous complexation of trivalent lanthanide and actinide cations by N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine

Jensen, Mark P.; Morss, Lester R.; Beitz, James V.; Ensor, D.D.

doi:10.1016/s0925-8388(00)00620-4

Cited by 87 publications

(70 citation statements)

References 16 publications

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“…The other was N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN, Fig. 1), [8][9][10][11] which is a neutral hexadentate ligand with four pyridyl groups connected by ethylenediamine. Diglycolamide and nitrogen-donor type extractants have been under intense study concerning extraction and group separation of actinides and lanthanides in the field of nuclear industry, 12,13 and also offer considerable potential as extractants for mutual separation among lanthanide elements.…”

Section: Introductionmentioning

confidence: 99%

Extraction Behavior and Separation of Lanthanides with a Diglycol Amic Acid Derivative and a Nitrogen-donor Ligand

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Extraction Behavior and Separation of Lanthanides with a Diglycol Amic Acid Derivative and a Nitrogen-donor Ligand

et al. 2007

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“…The other complexants selected for testing included N,N,N,N-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) and ammonium thiocyanate (NH 4 SCN). TPEN complexes of Am and Sm have modest stability constants, but do show selectivity for the actinide over the lanthanide element [13]. Ammonium thiocyanate has been used as a complexing agent in transuranic actinide/lanthanide separation processes in analytical chemistry [14,15].…”

Section: Introductionmentioning

confidence: 99%

Distribution of lanthanide and actinide elements between bis-(2-ethylhexyl)phosphoric acid and buffered lactate solutions containing selected complexants

Rudisill

DiPrete

Thompson

2012

J Radioanal Nucl Chem

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With the renewed interest in the closure of the nuclear fuel cycle, the TALSPEAK process is being considered for the separation of Am and Cm from the lanthanide fission products in a next generation reprocessing plant. However, an efficient separation requires tight control of the pH which likely will be difficult to achieve on a large scale. To address this issue, we measured the distribution of lanthanide and actinide elements between aqueous and organic phases in the presence of complexants which were potentially less sensitive to pH control than the diethylenetriaminepentaacetic (DTPA) used in the process. To perform the extractions, a rapid and accurate method was developed for measuring distribution coefficients based on the preparation of lanthanide tracers in the Savannah River National Laboratory neutron activation analysis facility. The complexants tested included aceto-, benzo-, and salicylhydroxamic acids, N,N,N,N-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN), and ammonium thiocyanate (NH 4 SCN). The hydroxamic acids were the least effective of the complexants tested. The separation factors for TPEN and NH 4 SCN were higher, especially for the heaviest lanthanides in the series; however, no conditions were identified which resulted in separations factors which consistently approached those measured for the use of DTPA.

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“…[5][6][7][8] N,N,N¢,N¢-(tetrakis-2-pyridylmethyl)ethylenediamine is recognized as a hexadentate ligand with six nitrogen donors and has been shown to chelate a variety of soft metal ions such as Hg, Cd, Au and Pd. [9][10][11][12][13] It was also shown to be effective for the chelation of f-block metals; the separation of minor actinides from high-level radioactive waste is a pressing issue. [14][15][16][17][18][19][20][21][22][23] Derivatives of TPEN have been used as extracting agents for a variety of metal ions in organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive extraction of cadmium(II) ions by poly(TPEN–NIPA) gels. Effect of chain length and branched spacer structure on gel formation and extraction behavior

Inaba

Tsumagari

Kida

et al. 2011

Polym J

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N,N,N¢,N¢-(tetrakis-2-pyridylmethyl)ethylenediamine (TPEN) derivatives bearing a polymerizable double bond in the substituent structure of the pyridine ring were synthesized and subjected to copolymerization with N-isopropylacrylamide in the presence of azobisisobutyronitrile. The obtained poly(TPEN-NIPA) gels show thermoresponsive swelling/shrinking behaviors, and are used for the extraction of cadmium(II) (Cd II ) ions from an aqueous solution to examine the relationship between gel characteristics and extraction performance. Polymer gels composed of TPEN derivatives bearing C3, C4, C10 and branched C3 spacer chains were synthesized, and the temperature-dependent Cd ion extraction behaviors of the gels were compared. The gels extracted Cd II ions efficiently from the aqueous solution in a swelling state at 5 1C, whereas little extraction was observed at 45 1C in the shrinking state. Poly(TPEN-NIPA) gel with branched C3 spacers (C3b) shows excellent thermoresponsive extraction performance.

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Aqueous complexation of trivalent lanthanide and actinide cations by N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine

Cited by 87 publications

References 16 publications

Extraction Behavior and Separation of Lanthanides with a Diglycol Amic Acid Derivative and a Nitrogen-donor Ligand

Extraction Behavior and Separation of Lanthanides with a Diglycol Amic Acid Derivative and a Nitrogen-donor Ligand

Distribution of lanthanide and actinide elements between bis-(2-ethylhexyl)phosphoric acid and buffered lactate solutions containing selected complexants

Thermoresponsive extraction of cadmium(II) ions by poly(TPEN–NIPA) gels. Effect of chain length and branched spacer structure on gel formation and extraction behavior

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