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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

Martinez-Martin, Paloma, Josefina Perles, and Juan Carlos Rodriguez-Ubis. "Crystal Structure Dependence of the Energy Transfer from Tb(III) to Yb(III) in Metal–Organic Frameworks Based in Bispyrazolylpyridines." Crystals 10, no. 2 (January 27, 2020): 69. http://dx.doi.org/10.3390/cryst10020069.

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Luminescent mixed lanthanide metal−organic framwork (MOF) materials have been prepared from two polyheterocyclic diacid ligands, 2,6-bis(3-carboxy-1-pyrazolyl)pyridine and 2,6-bis(4-carboxy-1-pyrazolyl)pyridine. The crystal structures of the two organic molecules are presented together with the structures for the MOFs obtained by hydrothermal synthesis either with Yb(III) or mixed Tb(III)/Yb(III) ions. Different coordination architectures result from each ligand, revealing also important differences between the lanthanides. The mixed lanthanide metal−organic frameworks also present diverse luminescent behavior; in the case of 2,6-bis(4-carboxy-1-pyrazolyl)pyridine, where no coordinated water is present in the metal environment, Tb(III) and Yb(III) characteristic emission is observed by excitation of the bispyrazolylpyridine chromophore.

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2

Sitran, Sergio, Dolores Fregona, and Giuseppina Faraglia. "Mixed Acetato-Dehydroacetato Complexes of Lanthanides." Journal of Coordination Chemistry 24, no. 2 (August 1991): 127–35. http://dx.doi.org/10.1080/00958979109409455.

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3

Chan, Eric J., Jack M. Harrowfield, Brian W. Skelton, and Allan H. White. "X-Ray Structural Studies of Small-Bite Ligands on Large Cations – Lanthanide(III) Ions and Dimethylphosphate." Australian Journal of Chemistry 73, no. 6 (2020): 539. http://dx.doi.org/10.1071/ch19506.

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Reactions of lanthanide chlorides or trifluoracetates (tfa) or picrates with trimethylphosphate alone in the first two cases or trimethylphosphate plus 1,10-phenanthroline or 2,2′;6′,2′′-terpyridine in the third, result in the formation of crystalline products containing dimethylphosphate (dmp–). Single crystal X-ray structural characterisation of these materials has shown that the stoichiometrically simple Ln(dmp)3 species obtained with chloride reactants and the lighter lanthanides are polymeric and commonly dimorphic, while the stoichiometrically more variable mixed dmp/tfa complexes have structures closely related to one phase of the Ln(dmp)3 family, and the presence of picrate and aza-aromatic ligands enables the isolation of Y and Lu derivatives containing binuclear species. In all, the dmp– ligands adopt exclusively the κ1O;κ1O′ bridging mode, the overall results indicating that this should apply to the complete lanthanide series.

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4

Beaudoux, Xavier, Matthieu Virot, Tony Chave, Gilles Leturcq, Nicolas Clavier, Nicolas Dacheux, and Sergey I. Nikitenko. "Catalytic dissolution of ceria–lanthanide mixed oxides provides environmentally friendly partitioning of lanthanides and platinum." Hydrometallurgy 151 (January 2015): 107–15. http://dx.doi.org/10.1016/j.hydromet.2014.11.011.

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5

Potts, Shannon Kimberly, Philip Kegler, Giuseppe Modolo, Simon Hammerich, Irmgard Niemeyer, Dirk Bosbach, and Stefan Neumeier. "Structural incorporation of lanthanides (La, Eu, and Lu) into U3O8 as a function of the ionic radius." MRS Advances 7, no. 7-8 (February 9, 2022): 128–33. http://dx.doi.org/10.1557/s43580-022-00226-1.

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AbstractThe International Atomic Energy Agency implements safeguard measures to verify the compliance of Member States to their international legal obligations using nuclear material and technology only for peaceful purposes. These safeguard measures, i.a., include analytical measurements of individual micrometer- and submicrometer particles taken by the IAEA on swipe samples during safeguard inspections at nuclear facilities. To ensure the quality control of the analytical results from particle analysis and to further develop mass spectrometric analysis methods, microparticles with well-defined properties as microparticulate reference materials are required. Therefore, mixed lanthanide/uranium oxide microparticles were produced as a first step towards composite reference materials with small amounts of fission products, Pu or Th. A deep understanding of the incorporation mechanisms of dopants into U3O8 structure is essential in this regard. Therefore, bulk-scale comparison materials were produced and doped with lanthanides by co-precipitation methods and systematically investigated by TG, XRD, and Raman. These results will be integrated into the particle production process to design well-defined microparticulate mixed-oxide reference materials. Graphical abstract

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6

Sulcová, P., L. Vitásková, and M. Trojan. "Study of Ce0.9Tb0.05Ln0.05O1.975 compounds as ceramic pigments." Journal of Mining and Metallurgy, Section B: Metallurgy 44, no. 1 (2008): 83–89. http://dx.doi.org/10.2298/jmmb0801083s.

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New inorganic pigments based on CeO2 were synthesized as high-temperature Environment friendly inorganic pigments. This work is focused on mixed oxides based on ceria which are doped by rare earth elements, i.e. compounds with formula Ce0.9Tb0.05Ln0.05O1.975, where Ln means lanthanides. The pigments were prepared by the solid state reaction. Their colour properties were investigated depending on content of selected lanthanides and calcination temperature. All prepared pigments were applied into organic matrix and ceramic glaze. The pigments were evaluated from the standpoint of their structure, colour properties and particle sizes.

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7

Khan, Azad A., Arun K. Saxena, and K. Iftikhar. "Mixed-ligand lanthanide complexes—X. Interaction of trivalent lanthanides with 1,10-phenanthroline and thiocyanate in alcohol." Polyhedron 16, no. 23 (September 1997): 4143–51. http://dx.doi.org/10.1016/s0277-5387(97)00139-3.

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8

Bhattacharyya, Arunasis, and Prasanta K. Mohapatra. "Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review." Radiochimica Acta 107, no. 9-11 (September 25, 2019): 931–49. http://dx.doi.org/10.1515/ract-2018-3064.

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Abstract Separation of trivalent actinide (An) and lanthanide (Ln) elements is one of the burning topics in the back end of the nuclear fuel cycle due to the similarity in their chemical behaviour. A significant amount of research is being carried out worldwide to develop suitable ligands for the separation of the trivalent actinides and lanthanides. Some of the research groups are engaged in continuous improvement of the di-ethylene-triamine-penta acetic acid (DTPA) based Ln/An separation method, whereas extensive research is going on for the development of the lipophilic and hydrophilic ‘N’ donor heteropolycyclic ligands as the actinide selective ligand. A number of ‘S’ donor ligands are also explored for the Ln/An separation. In the present review, we made an attempt to highlight various separation processes based on soft donor ligands developed for Ln/An separations. Beside the conventional solvent extraction processes, separation possibilities membrane based and solid phase extraction techniques are evaluated for the Ln/An separation and are compiled in the present review.

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9

Liu, Jing, Elena Quinteiro González, Anna M. Kaczmarek, and Rik Van Deun. "Dual-mode upconversion and downshifting white-light emitting Ln3+:Gd2W2O9 materials." New Journal of Chemistry 42, no. 4 (2018): 2393–400. http://dx.doi.org/10.1039/c7nj04337f.

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Both approaches (mixing two samples and co-doping with all the lanthanides) yielded materials which showed nearly identical downshifting white-light emission, while significantly different upconversion luminescence was obtained for the mixed powders and the co-doped synthesized materials.

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10

Sliusarchuk, Lyudmila, Lidia Zheleznova, and Artem Mishchenko. "MIXED-LIGAND ACETYLACETONATE COMPLEXES OF LANTANUM (III) AND GADOLINIUM (III) WITH CARBOXYLIC ACIDS AND ACETONITRILE OR DIMETHYLFORMAMIDE." Ukrainian Chemistry Journal 85, no. 1 (April 4, 2019): 3–12. http://dx.doi.org/10.33609/0041-6045.85.1.2019.3-12.

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This paper presents the study of mixed-ligand complexes of Ln(III), which are used as volatile precursors in CVD processes for the preparation of lanthanide-containing films and coatings. New mixed-ligand acetylacetonate complexes of lanthanides (III) with acetic (propionic) acid and acetonitrile or dimethylformamide were synthesized and investigated by physic-chemical methods of analysis (elemental analysis, differential thermal analysis, IR spectroscopy, powder X-ray diffraction). Using mixed-ligand complexation, the properties of the initial lanthanide β-diketonates (in particular, chemical and thermal stability) can be changed significantly. To assess the stability of the synthesized mixed-ligand complexes, their quantum-chemical modeling was performed using the semi-empirical method Sparkle/PM7. Standard changes of the Gibbs energy ∆G0298 were calculated for the solution reaction of (1) synthesis of mixed-ligand complexes and (2) substitution of one of the β-diketonate ligands in the Ln(III) tris-acetylacetonates dihydrates by an acetate ion or propionate ion. The ∆G0298 values for the syntesis reaction mainly increases with increasing donor basicity and decreasing ionic radii Ln(III) in the La>Gd>Lu series. For all mixed ligand complexes of Ln(III), the heats of formation are negative, which indicates their thermodynamic stability in solution. It was established that the obtained complexes have the same composition of the general formula [Ln(AA)2·L·2D], where Ln (III) = La, Gd; НАА- acetylacetonе; L - anion of acetic (HAc) or propionic (HРrop) acids, D- acetonitrile (AN), dimethylformamide (DMFA). The results of the thermal analysis confirm the computational data: in the case of the lanthanum mixed-ligand complexes, the carboxylic acid is coordinated to the central ion through bridging carboxylate-ions, which contributes to the formation of oligomers. The lanthanum mixed-ligand complexes are not volatile due to their oligomeric structure. On the other hand, similar gadolinium complexes are monomeric and sublimate at 180 - 350 °C.

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11

MEMON, A., M. N. KHAN, S. AL-DALLAL, D. B. TANNER, and C. D. PORTER. "FAR INFRARED REFLECTIVITY STUDY OF CERAMIC SUPERCONDUCTORS." International Journal of Modern Physics B 06, no. 21 (November 10, 1992): 3551–57. http://dx.doi.org/10.1142/s0217979292001572.

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We report on a study of the far-infrared reflectivity of mixed rare earths and lanthanides ceramic superconductors RBa 2 Cu 3 O 7 in the normal state. Our results show that the strength of the phonon modes is reduced when yittrium is partially replaced by gadolinium and europium. Also the critical temperature of these mixed materials is reduced as indicated by the four probe technique.

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12

Bochkarev, M. N., I. L. Fedyushkin, and R. B. Larichev. "Synthesis and characterization of mixed iodide-naphthalene complexes of lanthanides." Russian Chemical Bulletin 45, no. 10 (October 1996): 2443–44. http://dx.doi.org/10.1007/bf01435400.

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13

Shehata, N., K. Meehan, M. Hudait, N. Jain, and S. Gaballah. "Study of Optical and Structural Characteristics of Ceria Nanoparticles Doped with Negative and Positive Association Lanthanide Elements." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/401498.

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This paper studies the effect of adding lanthanides with negative association energy, such as holmium and erbium, to ceria nanoparticles doped with positive association energy lanthanides, such as neodymium and samarium. That is what we called mixed doped ceria nanoparticles (MDC NPs). In MDC NPs of grain size range around 6 nm, it is proved qualitatively that the conversion rate from Ce4+to Ce3+is reduced, compared to ceria doped only with positive association energy lanthanides. There are many pieces of evidence which confirm the obtained conclusion. These indications are an increase in the allowed direct band gap which is calculated from the absorbance dispersion measurements, a decrease in the emitted fluorescence intensity, and an increase in the size of nanoparticles, which is measured using both techniques: transmission electron microscope (TEM) and X-ray diffractometer (XRD). That gives a novel conclusion that there are some trivalent dopants, such as holmium and erbium, which can suppress Ce3+ionization states in ceria and consequently act as scavengers for active O-vacancies in MDC. This promising concept can develop applications which depend on the defects in ceria such as biomedicine, electronic devices, and gas sensors.

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14

Inoue, S., C. Fabara Ordonez, and H. Freiser. "MIXED LIGAND CHELATE EXTRACTION OF LANTHANIDES WITH N-m-TRIFLUOROMETHYLBENZOYL-PHENYLHYDROXYLAMINE SYSTEMS." Solvent Extraction and Ion Exchange 3, no. 6 (December 1985): 839–55. http://dx.doi.org/10.1080/07366298508918543.

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15

Gorantla, N. V. T. Sai Manoj, Saroj Kumar Kushvaha, Rajkumar Mandal, and Kartik Chandra Mondal. "A Series of Umbrella‐Shape Copper‐Lanthanides Based Mixed Metallic Coordination Complexes." ChemistrySelect 4, no. 29 (August 2019): 8424–28. http://dx.doi.org/10.1002/slct.201901352.

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16

Tai¨bi, M., J. Aride, E. Antic-Fidancev, M. Lemaitre-Blaise, P. Porcher, and P. Caro. "The optical properties of lanthanides in theLn2BaZnO5 area of the mixed oxide systemLnBaZnO." Journal of Solid State Chemistry 74, no. 2 (June 1988): 329–36. http://dx.doi.org/10.1016/0022-4596(88)90362-3.

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17

Fryzuk, Michael D., Peihua Yu, and Brian O. Patrick. "Synthesis, structure, and reactivity of diamidophosphine complexes of yttrium and the lanthanides." Canadian Journal of Chemistry 79, no. 7 (July 1, 2001): 1194–200. http://dx.doi.org/10.1139/v01-087.

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The reaction of the dilithiodiamidophosphine ligand precursor PhP(CH2SiMe2NPh)2Li2(THF)2([NPN]Li2(THF)2) with LnCl3(THF)3 (Ln = Y, Sm, Ho, Yb, Lu; THF = tetrahydrofuran) in refluxing toluene generates the mononuclear complexes [NPN]LnCl(THF) in good yield. The molecular structures have been shown to be five-coordinate in the solid state and in solution. Attempts to prepare alkyl derivatives have only met with partial success; the reaction of MeMgCl with [NPN]YCl(THF) generates the partially characterized mixed-metal derivative [NPN]YMe2MgCl. The reaction with LiAlH4 results in complete ligand exchange and the formation of the tetranuclear lithium aluminum hydride derivative {[NPN]AlH2Li(THF)}2. Reduction of the lutetium derivative with KC8 and naphthalene generated the dinuclear naphthalene-bridged species {[NPN]Lu}2(µ-η4:η4-C10H8) wherein each Lu centre engages in η4-coordination to opposite sides of the arene moiety. X-ray crystallography was used to characterize the four complexes.Key words: lanthanides, yttrium, mixed-donor ligands, aluminum, lithium, naphthalene.

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18

Farger, Pierre, Cédric Leuvrey, Mathieu Gallart, Pierre Gilliot, Guillaume Rogez, João Rocha, Duarte Ananias, Pierre Rabu, and Emilie Delahaye. "Magnetic and luminescent coordination networks based on imidazolium salts and lanthanides for sensitive ratiometric thermometry." Beilstein Journal of Nanotechnology 9 (October 30, 2018): 2775–87. http://dx.doi.org/10.3762/bjnano.9.259.

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The synthesis and characterization of six new lanthanide networks [Ln(L)(ox)(H2O)] with Ln = Eu3+, Gd3+, Tb3+, Dy3+, Ho3+ and Yb3+ is reported. They were synthesized by solvo-ionothermal reaction of lanthanide nitrate Ln(NO3)3·xH2O with the 1,3-bis(carboxymethyl)imidazolium [HL] ligand and oxalic acid (H2ox) in a water/ethanol solution. The crystal structure of these compounds has been solved on single crystals and the magnetic and luminescent properties have been investigated relying on intrinsic properties of the lanthanide ions. The synthetic strategy has been extended to mixed lanthanide networks leading to four isostructural networks of formula [Tb1− x Eu x (L)(ox)(H2O)] with x = 0.01, 0.03, 0.05 and 0.10. These materials were assessed as luminescent ratiometric thermometers based on the emission intensities of ligand, Tb3+ and Eu3+. The best sensitivities were obtained using the ratio between the emission intensities of Eu3+ (5D0→7F2 transition) and of the ligand as the thermometric parameter. [Tb0.97Eu0.03(L)(ox)(H2O)] was found to be one of the best thermometers among lanthanide-bearing coordination polymers and metal-organic frameworks, operative in the physiological range with a maximum sensitivity of 1.38%·K−1 at 340 K.

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19

Malmbeck, Rikard, Daniel Magnusson, Stéphane Bourg, Michael Carrott, Andreas Geist, Xavier Hérès, Manuel Miguirditchian, et al. "Homogenous recycling of transuranium elements from irradiated fast reactor fuel by the EURO-GANEX solvent extraction process." Radiochimica Acta 107, no. 9-11 (September 25, 2019): 917–29. http://dx.doi.org/10.1515/ract-2018-3089.

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Abstract The EURO-GANEX process was developed for co-separating transuranium elements from irradiated nuclear fuels. A hot flow-sheet trial was performed in a counter-current centrifugal contactor setup, using a genuine high active feed solution. Irradiated mixed (carbide, nitride) U80Pu20 fast reactor fuel containing 20 % Pu was thermally treated to oxidise it to the oxide form which was then dissolved in HNO3. From this solution uranium was separated to >99.9 % in a primary solvent extraction cycle using 1.0 mol/L DEHiBA (N,N-di(2-ethylhexyl)isobutyramide in TPH (hydrogenated tetrapropene) as the organic phase. The raffinate solution from this process, containing 10 g/L Pu, was further processed in a second cycle of solvent extraction. In this EURO-GANEX flow-sheet, TRU and fission product lanthanides were firstly co-extracted into a solvent composed of 0.2 mol/L TODGA (N,N,N′,N′-tetra-n-octyl diglycolamide) and 0.5 mol/L DMDOHEMA (N,N′-dimethyl-N,N′-dioctyl-2-(2-hexyloxy-ethyl) malonamide) dissolved in Exxsol D80, separating them from most other fission and corrosion products. Subsequently, the TRU were selectively stripped from the collected loaded solvent using a solution containing 0.055 mol/L SO3-Ph-BTP (2,6-bis(5,6-di(3-sulphophenyl)-1,2,4-triazin-3-yl)pyridine tetrasodium salt) and 1 mol/L AHA (acetohydroxamic acid) in 0.5 mol/L HNO3; lanthanides were finally stripped using 0.01 mol/L HNO3. Approximately 99.9 % of the TRU and less than 0.1 % of the lanthanides were found in the product solution, which also contained the major fractions of Zr and Mo.

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20

Chang, C. Allen, B. S. Garg, V. K. Manchanda, V. O. Ochaya, and V. C. Sekhar. "Mixed ligand complexes of lanthanides with macrocyclic and open-chained polyaminopolycarboxylic acids and acetylacetone." Inorganica Chimica Acta 115, no. 1 (May 1986): 101–6. http://dx.doi.org/10.1016/s0020-1693(00)87705-1.

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21

Mahmoud, Faten Z., and Mohamed F. M. Eid. "Thermodynamic behavior and stability constants of lanthanides–Schiff base complexes in mixed aqueous solvents." Structural Chemistry 23, no. 6 (March 6, 2012): 1723–28. http://dx.doi.org/10.1007/s11224-012-9976-3.

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22

Ramirez, A. "Study of the mixed-metal lanthanummagnesium-purpurin complex: spectrophotometric determination of yttrium and lanthanides." Talanta 33, no. 12 (December 1986): 1021–25. http://dx.doi.org/10.1016/0039-9140(86)80244-2.

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23

Joo, Min Hee, So Jeong Park, Hye Ji Jang, Sung-Min Hong, Choong Kyun Rhee, and Youngku Sohn. "Electrochemistry, Electrodeposition, and Photoluminescence of Eu (III)/Lanthanides (III) on Terpyridine-Functionalized Ti Nanospikes." Metals 11, no. 6 (June 18, 2021): 977. http://dx.doi.org/10.3390/met11060977.

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Terpyridine-functionalized Ti nanospike electrodes (TiNS-SiTpy) were developed and applied to cyclic voltammetry and amperometry of Ln (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) ions and mixed Eu (III) + Ln (III) ions in a 0.1 M NaClO4 electrolyte. Electrodeposition was successfully performed over TiNS-SiTpy electrodes, which were fully examined by scanning electron microscopy, X-ray diffraction crystallography, Fourier-transform infrared spectroscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, photoluminescence (PL), and PL decay kinetics. The Gd and Tb ions were found to increase PL intensities with 10× longer lifetimes of 1.32 μs and 1.03 μs, respectively, compared with that of the electrodeposited Eu sample. The crystal phase and the oxidation states were fully examined for the mixed Ln (Eu + Gd and Eu + Tb) complex structures.

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24

Reger, Daniel L., Andrew Leitner, and Mark D. Smith. "Homochiral, Helical Coordination Complexes of Lanthanides(III) and Mixed-Metal Lanthanides(III): Impact of the 1,8-Naphthalimide Supramolecular Tecton on Structure, Magnetic Properties, and Luminescence." Crystal Growth & Design 15, no. 11 (October 12, 2015): 5637–44. http://dx.doi.org/10.1021/acs.cgd.5b01387.

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25

Zhou, Yan, Heng-Yi Zhang, and Yu Liu. "Photochemically driven luminescence switch of metal supramolecular assembly incorporating mixed lanthanides and photochromic guest molecule." Journal of Photochemistry and Photobiology A: Chemistry 355 (March 2018): 242–48. http://dx.doi.org/10.1016/j.jphotochem.2017.09.024.

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26

Chang, C. Allen, B. S. Garg, V. K. Manchanda, V. O. Ochaya, and V. C. Sekhar. "Mixed ligand complexes of lanthanides with macrocyclic and open-chained polyamino-polycarboxylic acids and acetylacetone." Journal of the Less Common Metals 126 (December 1986): 397. http://dx.doi.org/10.1016/0022-5088(86)90333-4.

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27

Jia, Lipei, Zejun Li, Weiqun Shi, and Xinghai Shen. "A novel CPE procedure by oil-in-water microemulsion for preconcentrating and analyzing thorium and uranium." Radiochimica Acta 110, no. 4 (March 18, 2022): 239–49. http://dx.doi.org/10.1515/ract-2021-1139.

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Abstract A novel cloud point extraction (CPE) procedure was developed to preenrich Th4+ and UO2 2+ by oil-in-water (O/W) microemulsion. Coupling CPE to ICP-MS, the separation and analysis were achieved at a trace level, in which the low detection limits were 0.019 and 0.042 ng mL−1 for Th(IV) and U(VI), respectively. N,N′-diethyl-N,N′-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen), as an extremely hydrophobic extractant, was failed to dissolve in single or mixed micelles, but was successfully solubilized to CPE system owing to O/W microemulsion. The extraction efficiency and selectivity for Th4+ and UO2 2+ were excellent under acidic condition of 1.0 mol L−1 HNO3, and the recovery of ultra-trace Th4+ and UO2 2+ was almost 100% even at the presence of large amounts of lanthanides, exhibiting high tolerance limits for lanthanides. The solubilization, extraction and coordination behaviours were studied systematically via DLS, UV–vis, 1H NMR and FT-IR. Moreover, the solubilization of N,N′-dioctyl-N,N′-dioctyl-2,9-diamide-1,10-phenanthroline (Oct-Oct-DAPhen) and efficient extraction for UO2 2+ were also realized by O/W microemulsion, which further proved the feasibility of the method.

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28

Zhai, Rui, Fenglong Jiao, Duan Feng, Feiran Hao, Jiabin Li, Nannan Li, Hui Yan, et al. "Preparation of mixed lanthanides-immobilized magnetic nanoparticles for selective enrichment and identification of phosphopeptides by MS." ELECTROPHORESIS 35, no. 24 (July 15, 2014): 3470–78. http://dx.doi.org/10.1002/elps.201400139.

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29

Sulcová, P., and E. Proklesková. "The effect of lanthanides on color properties of the (Bi2O3)0.7(Ln2O3)0.3 compounds." Journal of Mining and Metallurgy, Section B: Metallurgy 44, no. 1 (2008): 27–33. http://dx.doi.org/10.2298/jmmb0801027s.

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(Bi2O3)0.7(Ln2O3)0,3 solid solutions were synthesized as new inorganic yellow and orange pigments and their color properties have been investigated as possible ecological materials. The pigments were prepared by the solid state reaction of mixed oxides (Bi2O3)0.7(Ln2O3)0.3 of various rare earth cations (Ln = Eu, Gd, Tm, Yb and Lu). All the synthesized pigment samples were found to have color coordinates, low a* and high b* and exhibit the color from pale light yellow to orange. Reflectance spectra of the samples show high reflectance percentage in the 600 - 700 nm range. Characterization of the (Bi2O3)0.7(Ln2O3)0,3 solid solutions suggests that they have a potential to be alternative yellow colorants for paints, inks, plastics, and ceramics.

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30

Chang-ling, Qu, and Henry Freiser. "MIXED LIGAND CHELATE EXTRACTION OF LANTHANIDES WITH 2-(2-PYRIDYLAZO)-4-NONYLPHENOL AND TRI-N-OCTYLPHOSPHINE OXIDE." Solvent Extraction and Ion Exchange 7, no. 1 (January 1989): 31–45. http://dx.doi.org/10.1080/07360298908962295.

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31

Schumann, Herbert, Dominique M. M. Freckmann, and Sebastian Dechert. "Organometallic Compounds of the Lanthanides. 179.1Synthesis and Structural Characterization of a Mixed Alkyl (Benzhydryl, Trimethylsilylmethyl) Lutetium Complex." Organometallics 25, no. 10 (May 2006): 2696–99. http://dx.doi.org/10.1021/om0601201.

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32

FUJINAGA, K., M. HOJJATIE, and H. FREISER. "Mixed ligand chelate extraction of lanthanides with 5,7-dibromo-8-quinolinol and 4,4'-(5-nonyl)-2,2'-dipyridylamine systems." Analytical Sciences 4, no. 2 (1988): 139–42. http://dx.doi.org/10.2116/analsci.4.139.

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33

Metwally, S. S., and H. E. Rizk. "Preparation and Characterization of Nano-Sized Iron–Titanium Mixed Oxide for Removal of Some Lanthanides from Aqueous Solution." Separation Science and Technology 49, no. 15 (September 30, 2014): 2426–36. http://dx.doi.org/10.1080/01496395.2014.926457.

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34

Reddy, M. "Mixed-ligand chelate extraction of trivalent lanthanides with 4,4,4-trifluoro-1-phenyl-1,3-butanedione and neutral oxo-donors." Talanta 44, no. 1 (January 1997): 97–103. http://dx.doi.org/10.1016/s0039-9140(96)02024-3.

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35

Ferrence, Gregory M., Robert McDonald, Martin Morissette, and Josef Takats. "Mixed pyrazolylborate/cyclopentadienyl derivatives of divalent lanthanides: synthesis and structure of (TptBu,Me)Yb(C5H4R) (R=H, SiMe3)." Journal of Organometallic Chemistry 596, no. 1-2 (February 2000): 95–101. http://dx.doi.org/10.1016/s0022-328x(99)00559-8.

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36

Schumann, Herbert, Frank Erbstein, Katja Herrmann, Jörg Demtschuk, and Roman Weimann. "Organometallic compounds of the lanthanides. CXXI. Donor-substituted lanthanidocenes. Synthesis of mixed unbridged lanthanidocene chloride and alkyl derivatives." Journal of Organometallic Chemistry 562, no. 2 (July 1998): 255–62. http://dx.doi.org/10.1016/s0022-328x(98)00541-5.

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37

Lin, Xi, Tianfu Liu, Jingxiang Lin, Hongxun Yang, Jian Lü, Bo Xu, and Rong Cao. "Syntheses and characterizations of two new pillared-layer coordination polymers constructed from lanthanides and mixed O-donor ligands." Inorganic Chemistry Communications 13, no. 3 (March 2010): 388–91. http://dx.doi.org/10.1016/j.inoche.2009.12.030.

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38

Attallah, Mohamed F., Maha A. Youssef, and Diaa M. Imam. "Preparation of novel nano composite materials from biomass waste and their sorptive characteristics for certain radionuclides." Radiochimica Acta 108, no. 2 (January 28, 2020): 137–49. http://dx.doi.org/10.1515/ract-2019-3108.

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AbstractThe aim of this work is directed to prepare nanoparticles of egg shell hydroxyapatite-humic acid (ESHAP-HA) as a novel composite material. FTIR, EDX, TEM, XRD, and SEM identified it. Sorption characteristic studies on ESHAP-HA at different pH of solutions, shaking time, initial ion concentration and complexing agent were performed at 152,154Eu, 99Mo and 63Ni. The results were demonstrated that selectivity removal of 152,154Eu (~96 %) rather than 99Mo (8.5 %) and 63Ni (26.7 %). The sorption capacity of 152,154Eu(III), 63Ni(II) and 99Mo(VI) are 80.1, 12.5 and 2.3 mg/g, respectively, onto the ESHAP-HA nanoparticles. Application on the eclectic removal of 152,154Eu from mixed radionuclides (152,154Eu, 60Co, and 137Cs) solution has been evaluated. It concluded that the prepared ESHAP-HA composite material is a promising and recommended for separation of radio lanthanides and/or actinides (such as Am) from nuclear liquid waste and/or contaminated aquatic environmental.

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39

Iftikhar, Khalid, Anis U. Malik, and Naseer Ahmad. "Mixed-ligand complexes of trivalent lanthanides. Part 3. Complexes of heptafluorodimethyloctane-3,5-dione and pyrazine: syntheses and spectral studies." Journal of the Chemical Society, Dalton Transactions, no. 12 (1985): 2547. http://dx.doi.org/10.1039/dt9850002547.

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40

Sharma, Renu, and Peter Crozier. "Quantification of CeO2 Reduction By In Situ Electron Energy-Loss Spectroscopy." Microscopy and Microanalysis 6, S2 (August 2000): 12–13. http://dx.doi.org/10.1017/s1431927600032554.

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CeO2 is an important material in many catalyst applications. CeO2, PrO2 and TbO2 are the only lanthanides known to exist as oxides in both 3+ and 4+ oxidation states. The high oxygen mobility at low temperature (≈300°C) results in easy oxidation-reduction cycles; a property utilized in the catalyst industry, especially for CeO2. Studying the oxidation-reduction behavior is thus very important to understanding the reactivity of CeO2 as a catalyst. We have studied CeO2 by in situ electron diffraction, high resolution electron microscopy (HREM) and electron energy-loss spectroscopy (EELS), not only to understand the reduction behavior but also to develop a method to quantify the reducibility of CeO2 or mixed oxides containing CeO2 by EELS. We have applied this method to study the behavior of ZrO2-CeO2 catalyst during reduction.Experiments were performed on a PHILIPS-430 electron microscope operated at 300KV, fitted with a differentially pumped environmental cell and a Gatan Imaging Filter (GIF).

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41

Umetani, Shigeo, and H. Freiser. "Mixed-ligand chelate extraction of lanthanides with 1-phenyl-3-methyl-4-(trifluoroacetyl)-5-pyrazolone and some phosphine oxide compounds." Inorganic Chemistry 26, no. 19 (September 1987): 3179–81. http://dx.doi.org/10.1021/ic00266a023.

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42

Motoc, Adrian Mihail, Sorina Valsan, Anca Elena Slobozeanu, Mircea Corban, Daniele Valerini, Mythili Prakasam, Mihail Botan, et al. "Design, Fabrication, and Characterization of New Materials Based on Zirconia Doped with Mixed Rare Earth Oxides: Review and First Experimental Results." Metals 10, no. 6 (June 3, 2020): 746. http://dx.doi.org/10.3390/met10060746.

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Monazite is one of the most valuable natural resources for rare earth oxides (REOs) used as dopants with high added value in ceramic materials for extreme environments applications. The complexity of the separation process in individual REOs, due to their similar electronic configuration and physical–chemical properties, is reflected in products with high price and high environmental footprint. During last years, there was an increasing interest for using different mixtures of REOs as dopants for high temperature ceramics, in particular for ZrO2-based thermal barrier coatings (TBCs) used in aeronautics and energy co-generation. The use of mixed REOs may increase the working temperature of the TBCs due to the formation of tetragonal and cubic solid solutions with higher melting temperatures, avoiding grain size coarsening due to interface segregation, enhancing its ionic conductivity and sinterability. The thermal stability of the coatings may be further improved by using rare earth zirconates with perovskite or pyrochlore structures having no phase transitions before melting. Within this research framework, firstly we present a review analysis about results reported in the literature so far about the use of ZrO2 ceramics doped with mixed REOs for high temperature applications. Then, preliminary results about TBCs fabricated by electron beam evaporation starting from mixed REOs simulating the real composition as occurring in monazite source minerals are reported. This novel recipe for ZrO2-based TBCs, if optimized, may lead to better materials with lower costs and lower environmental impact, as a result of the elimination of REOs extraction and separation in individual lanthanides. Preliminary results on the compositional, microstructure, morphological, and thermal properties of the tested materials are reported.

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43

Loufouilou, Edouard Laurent, and Jean Paul Gisselbrecht. "Stepwise reduction of samarium cryptates in propylene carbonate: anions and water concentration effects on the redox behavior of the Sm(III)/Sm(II) couple." Canadian Journal of Chemistry 66, no. 9 (September 1, 1988): 2172–76. http://dx.doi.org/10.1139/v88-345.

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The polarographic reduction of samarium(III) cryptates with cryptands 222, 221, and 22 was investigated in propylene carbonate. The samarium(III) cryptates are reduced in two consecutive steps, the first step was reversible and corresponded to the reduction of the Sm(III) to the Sm(II) cryptate. The Sm(III)/Sm(II) redox potential of the cryptates depended on the anion used in the complex and, in the case of the cryptate with chloride anions, a stable mixed complex was observed in propylene carbonate. The Sm(III)/Sm(II) redox potentials of the cryptates were more cathodic than the redox potential of the uncomplexed Sm(III)/Sm(II) couple, which is typical of a lower stability of the reduced cryptate. Propylene carbonate does not stabilize low oxidation states of lanthanides by cryptation. This is at variance with behavior observed previously in other media like water and methanol. Variations of redox potentials as a function of increasing amounts of water were accounted for by solvent shielding of samarium(III) upon encapsulation in cryptands.

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44

Wong-Ng, W., G. Liu, Y. G. Yan, and J. A. Kaduk. "Structure and X-ray reference diffraction patterns of (Ba6−xSrx)R2Co4O15 (x = 1, 2) (R = lanthanides)." Powder Diffraction 28, no. 3 (April 25, 2013): 212–21. http://dx.doi.org/10.1017/s0885715613000171.

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The structure and X-ray patterns of two series of barium lanthanide cobaltates, namely, Ba4Sr2R2Co4O15 (R = La, Nd, Sm, Eu, Gd, and Dy), and Ba5SrR2Co4O15 (R = La, Nd, Sm, Eu, and Gd) have been determined. These compounds crystallize in the space group P63mc; the unit-cell parameters of Ba4Sr2R2Co4O15 (R from La to Dy) decrease from a = 11.6128(2) Å to 11. 5266(9) Å, c = 6.869 03(11) to 6. 7630(5) Å, and V = 802.23(3) Å3 to 778.17(15) Å3, respectively. In the Ba5SrR2Co4O15 series (R = La to Gd), the unit-cell parameters decrease from a = 11.735 44(14) Å to 11.619 79(12) Å, c = 6.942 89 (14) Å to 6.836 52(8) Å, and V = 828.08(3) Å3 to 799.40(2) Å3. In the general structure of (Ba6−xSrx)R2Co4O15, there are four Co ions per formula unit occupying one CoO6 octahedral and three CoO4 tetrahedral units. Through corner-sharing of these polyhedra, a larger Co4O15 unit is formed. Sr2+ ions adopt both octahedral and 8-fold coordination environment. R3+ ions adopt 8-fold coordination (mixed site with Sr), while the larger Ba2+ ions assume both 10- and 11-fold coordination environments. The samples were found to be insulators. X-ray diffraction patterns of these samples have been determined and submitted to the Powder Diffraction File (PDF).

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45

Turanov, Alexander N., Anna G. Matveeva, Igor Yu Kudryavtsev, Margarita P. Pasechnik, Sergey V. Matveev, Maria I. Godovikova, Tatyana V. Baulina, Vasilii K. Karandashev, and Valery K. Brel. "Tripodal organophosphorus ligands as synergistic agents in the solvent extraction of lanthanides(III). Structure of mixed complexes and effect of diluents." Polyhedron 161 (March 2019): 276–88. http://dx.doi.org/10.1016/j.poly.2019.01.036.

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46

Madanhire, Tatenda, Hajierah Davids, Melanie C. Pereira, Eric C. Hosten та Abubak'r Abrahams. "Mixed-ligand complexes of lanthanides derived from an α-hydroxycarboxylic acid (benzilic acid) and 1,10-phenanthroline: Physicochemical properties and anticancer activity". Polyhedron 185 (липень 2020): 114583. http://dx.doi.org/10.1016/j.poly.2020.114583.

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47

Gbehi, T., J. Théry та D. Vivien. "Synthesis characterization and spectroscopic investigations of mixed barium lanthanides (La, Nd) hexaaluminates, with a structure related to magnetoplumbite and β alumina". Materials Research Bulletin 22, № 1 (січень 1987): 121–29. http://dx.doi.org/10.1016/0025-5408(87)90159-0.

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48

Ikeda, Atsushi, Tatsuya Suzuki, Masao Aida, Yasuhiko Fujii, Keisuke Itoh, Toshiaki Mitsugashira, Mitsuo Hara, and Masaki Ozawa. "Effect of alcohols on elution chromatography of trivalent actinides and lanthanides using tertiary pyridine resin with hydrochloric acid–alcohol mixed solvents." Journal of Chromatography A 1041, no. 1-2 (July 2004): 195–200. http://dx.doi.org/10.1016/j.chroma.2004.04.045.

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49

Wang, Suning. "Copper(II)/alkaline-earth metal(II) and copper(II)/lanthanides(III) mixed metal complexes containing bifunctional pyridyl alcohol or amino alcohol ligands." Polyhedron 17, no. 5-6 (March 1998): 831–43. http://dx.doi.org/10.1016/s0277-5387(97)00291-x.

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50

Murthy, K. S. R., R. J. Krupadam, and J. Anjaneyulu. "Separation and Estimation of Lanthanides as Mixed-Ligand Complexes with Hexafluoroacetylacetone and Tri-n-octylphosphine Oxide Using Solvent Extraction and Gas Chromatography." Journal of Chromatographic Science 36, no. 12 (December 1, 1998): 595–99. http://dx.doi.org/10.1093/chromsci/36.12.595.

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