Tripodal organophosphorus ligands as synergistic agents in the solvent extraction of lanthanides(III). Structure of mixed complexes and effect of diluents

Туранов, А. Н.; Матвеева, А. Г.; Kudryavtsev, I. Yu.; Пасечник, М. П.; Матвеев, С. В.; Godovikova, M. I.; Баулина, Т. В.; Карандашев, В. К.; Brel, V. K.

doi:10.1016/j.poly.2019.01.036

Cited by 14 publications

(3 citation statements)

References 44 publications

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“…In particular, in the field of metal extraction, separation, and recycling by liquid-liquid processes, hydrophobic ILs of the imidazolium type [C n C m im + ][Tf 2 N − ] have already proved to be tremendously efficient media for a large variety of metals in the periodic table including lanthanoids (cations are denoted as [C n C m im + ] for n-alkyl-m-alkylimidazolium, whereas they are denoted as the anion [(CF 3 SO 2 ) 2 N − ] (bis(trifluoromethylsulfonyl) for imide, [Tf 2 N − ]) [10][11][12][13][14][15]. However, in one way or another, the prediction of diluent effects is a challenging task in solvent extraction chemistry [16][17][18] or separation methods such as adsorption, biosorption, precipitation, reverse osmoses, ion exchange, [19][20][21][22][23][24][25][26], etc.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Gd(III) Solvent Extraction by 4-Benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one: Non-Aqueous Systems

Atanassova

Kukeva

2023

Separations

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The study of the liquid–liquid extraction of gadolinium (Gd(III) ion) with a chelating compound, 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP), and the determination of the process parameters are presented by employing two ionic liquids, namely, ([C1Cnim+][Tf2N−], n = 4, 10) and CHCl3, as diluents. Compared to CHCl3, the ionic liquid offers increased distribution ratios in an aqueous medium. A step forward, enhanced solvent extraction, and improved separation upon the addition of ethylene glycol are demonstrated, i.e., a boost of two immiscible organic phases, compared to traditional aqueous solutions. However, this is noticeable when using CHCl3, but unfortunately not with ionic liquid combination, [C1C10im+][Tf2N−]. Several conclusions are given, highlighting the role of the ionic diluent in complexation processes and selectivity with an employment of the chelating agent HP for various metal s-, p-, d-, and f-cations, i.e., nearly 25 metals. A detailed evaluation of the selectivity between these metals was made when changing both the aqueous phase completely with ethylene glycol or partially with glycerol (1:1). Electron paramagnetic resonance (EPR) spectroscopy has been used to study the established chemical species in the obtained organic extracts, such as Gd3+, Fe3+, Cu2+, and Cr3+, with unpaired electrons.

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Section: Introductionmentioning

confidence: 99%

Improvement of Gd(III) Solvent Extraction by 4-Benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one: Non-Aqueous Systems

Atanassova

Kukeva

2023

Separations

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“…Further, in general, the tetradentate diiminedioxime ligands behaved like dioxime or aminooximes by enveloping themselves around the metal ions in a planar geometry, forming a hydrogen bond between the two oxime groups by removing one hydrogen ion [23][24][25]. As a whole, lanthanoid ions preferred to bind to hard donors such as O and F, rather than to soft bases, such as P and S donor ligands [26,27]. On the other hand, nitrogen-containing ligands were an apparent anomaly, since they could form relatively few complexes, at least partly due to the high basicity of some specific molecules.…”

Section: Introductionmentioning

confidence: 99%

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Atanassova,

Kukeva,

Kurteva

2023

Molecules

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A study on the synergistic extraction of Eu(III) ions with a series of chelating ligands and determination of the process parameters is presented by employing ionic liquids and typical organic diluents. The investigations of the liquid–liquid extraction, commonly applied in the separation science of 4f and 5f-ions acidic chelating compounds, 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (HP), 4-benzoyl-3-phenyl-5-isoxazolone (HPBI), and 2-thenoyltrifluoroacetone (HTTA) alone and in combination with two synergistic agents, meso-hexamethylpropyleneamine oxime (S2: HM-PAO) and its bis-imine precursor (S1: pre-HM-PAO), are presented. The interaction between the two extractants (acidic/neutral) in deuterochloroform was studied using 1H, 13C, and 1H-1H NOESY experiments. Several conclusions are given highlighting the role of the ionic diluent in complexation processes and selectivity with an employment of the two synergistic agents for various metal s-, p-, d-, and f-cations in the Periodic table, with almost 25 metal ions. The objective was to optimize a system for 4f-ions solvent extraction based on the new oxime molecules with β-diketone/isoxazolone/pyrazolone partnership. As detailed above, slight enhancements of extraction efficiencies were obtained either by using basic synergistic agents such as HM-PAO and/or using pre-HM-PAO. A competitive solvent extraction test of nearly 18 f-ions by various ligands (HTTA, S1, S2, and HPBI) and the two mixtures HTTA−S1 and HTTA−S2 diluted in ILs or organic diluents was also conducted in order to evaluate the switchable diluent impact. Additionally, electron paramagnetic resonance (EPR) spectroscopy was used to study the established chemical species with Cu2+ cations in the obtained organic extracts involving the two synergistic molecules.

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“…The use of triphenylphosphine oxide fragment as the core of a tripodal ligand can favor the complex formation with metal ions [25][26][27][28][29]. The combination of the P=O fragment and tetrazole functional groups in hybrid ligands affords the compounds promising as ligands and biologically active molecules.…”

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confidence: 99%

Tripodal Phosphine Oxide Ligand with Tetrazole Functionality

et al. 2021

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Tris[2-(3′-cyanopropoxy)phenyl]phosphine oxide has been obtained via the alkylation of tris(2hydroxyphenyl)phosphine oxide with 4-bromobutyronitrile in the presence of K2CO3. The product structure has been elucidated by means of X-ray diffraction analysis. The terminal cyano groups in the obtained phosphine oxide have been converted into tetrazole rings via the click-reaction with NH4N3 to give a new hybrid tripodal propeller ligand, tris{2-[3′-(tetrazol-5′′-yl)propoxy]phenyl}phosphine oxide. Palladium(II) complexes of the prepared ligand and its short-linker analog, tris[2-(tetrazol-5′-ylmethoxy)phenyl]phosphine oxide, have been synthesized. Cytotoxicity of the ligands and their Pd(II) complexes has been studied.

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Tripodal organophosphorus ligands as synergistic agents in the solvent extraction of lanthanides(III). Structure of mixed complexes and effect of diluents

Cited by 14 publications

References 44 publications

Improvement of Gd(III) Solvent Extraction by 4-Benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one: Non-Aqueous Systems

Improvement of Gd(III) Solvent Extraction by 4-Benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one: Non-Aqueous Systems

New Sustainable Solvent Extraction Pathways for Rare Earth Metals via Oximes Molecules

Tripodal Phosphine Oxide Ligand with Tetrazole Functionality

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