Extraction of Some Lanthanides and Actinides by 15-Crown-5 Thenoyltrifluoroacetone Mixture in Chloroform

Aly, H. F.; Khalifa, S. M.; Navratil, J.D.; Saba, M.

doi:10.1080/07366298508918531

Cited by 46 publications

(18 citation statements)

References 7 publications

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“…Uranyl can easily form complexes with various types of ligands. Several studies have been carried out to enhance the selectivity in the separation of lanthanides and actinides elements in the extraction systems based on the size-fitting effect of the crown ethers [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Rounaghi

Nouri

Tarahomi

2011

J Incl Phenom Macrocycl Chem

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The complexation reaction of N-phenylaza-15-crown-5 (PhA15C5) with UO 2 2? cation was studied in acetonitrile-methanol (AN-MeOH), acetonitrile-butanol (ANBuOH), acetonitrile-dimethylformamide (AN-DMF) and methanol-propylencarbonate (MeOH-PC) binary solutions, at different temperatures by conductometry method. The conductance data show that the stoichiometry of the complex formed between PhA15C5 with UO 2 2? cation in most cases is 1:1 [M:L], but in some solvent systems a 1:2 [M:L 2 ] complex is formed in solutions. The results revealed that, the stability constant of (PhA15C5ÁUO 2 ) 2? complex in the binary mixed solvents varies in the order: AN-BuOH[ANMeOH[AN-DMF. In the case of the pure organic solvents, the sequence of the stability of the complex changes as: AN[PC[BuOH[DMF. A non-linear relationship was observed for changes of logK f of (PhA15C5ÁUO 2 ) 2? complex versus the composition of the binary mixed solvents. The corresponding standard thermodynamic parameters (DH c°, DS c°) were obtained from temperature dependence of the stability constant. The results show that the values and also the sign of these parameters are influenced by the nature and composition of the mixed solvents.

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Section: Introductionmentioning

confidence: 99%

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Rounaghi

Nouri

Tarahomi

2011

J Incl Phenom Macrocycl Chem

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“…Most recently, remarkable increases of an extractability and selectivity were achieved by Kitatsuji and coworkers [4] in the synergistic ion-pair extraction of lanthanides with 18-crown-6 or dicyclohexano-18-crown-6 in the presence of thenoyltrifluoroacetone (ΗΤΤΑ). Significant enhancement in the extraction of trivalent lanthanides with ΗΤΤΑ in the presence of 15-crown-5 was reported by Aly et al [5]. Compared with studies on the synergistic solvent extraction of trivalent lanthanides involving ΗΤΤΑ and crown ethers, the systematic study of the synergistic extraction systems involving crown ethers as synergists in the presence of 4-acyl pyrazolone is sparse [6,7], Among 4-acyl pyrazolones, l-phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5 (HPMTFP) exhibits an * Author for correspondence.…”

Section: Introductionmentioning

confidence: 54%

“…The extraction equilibria of Nd(III), Eu(III) and Tm(III) with HPMTFP in the presence of a crown ether (CE) can be written as Ln^ + 3HPMTFPOTg + nCEorg = • nCEOIg + 3H^ Ln(PMTFP)3 (5) where η = the number of crown ether molecules attached to the chelate system and is equal to 0 or 1. Then D can be written as chloroform as diluent as was confirmed experimentally.…”

Section: Extraction Of Trivalent Lanthanides With a Mixture Of Hpmtfpmentioning

confidence: 99%

Crown Ethers as Synergists in the Extraction of Trivalent Lanthanides by 1 -Phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5

et al. 1996

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Synergistic extraction of trivalent lanthanides such as Nd, Eu and Tm with mixtures of l-phenyl-3-methyl-4-trifluoroacetylpyrazolone-5 (HPMTFP) and 18-crown-6 or dibenzo-18-crown-6 or 15-crown-5 or monobenzo-15-crown-5 (CE) in chloroform has been investigated. Lanthanides are found to be extracted as Ln(PMTFP) 3 with HPMTFP alone and in the presence of crown ether (CE) as Ln(PMTFP) 3 · CE. The equilibrium constants of the above species are found to increase monotonically with decreasing ionic radii of these metal ions. The addition of a crown ether to the metal chelate system not only enhances the extraction efficiency but also improves the selectivities among these trivalent lanthanides.

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“…There are several reports in which crown ethers have been used for the transport of metal ions by ion-pair extraction using ␤-diketones along with crown ethers in the chloroform layer (10)(11)(12). In the presence of crown ethers alone in the membrane phase, the transport of the metal ions is negligible, but the presence of ␤-diketones results in the synergistic extraction of these metal ions into the organic phase.…”

Section: Introductionmentioning

confidence: 99%

Crown Ethers as Carriers for the Transport of Anionic Thiocyanate Complex of Uranyl Ion Across a Bulk Liquid Membrane

Ramkumar

Maiti

Mathur

et al. 2000

Separation Science and Technology

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Extraction of Some Lanthanides and Actinides by 15-Crown-5 Thenoyltrifluoroacetone Mixture in Chloroform

Cited by 46 publications

References 7 publications

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Crown Ethers as Synergists in the Extraction of Trivalent Lanthanides by 1 -Phenyl-3-methyl-4-trifluoroacetyl-pyrazolone-5

Crown Ethers as Carriers for the Transport of Anionic Thiocyanate Complex of Uranyl Ion Across a Bulk Liquid Membrane

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