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Moeller, Katrin; Vogel, Lutz

doi:10.7788/9783412511937.433

Cited by 2 publications

(2 citation statements)

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“…Specifically, we monitored the transchelation reaction of these Ln 3+ complexes by UV−Vis spectroscopy in the presence of 100-fold excess DTPA at pH 7.4 and RT (22 °C), conditions that thermodynamically favor loss of the Ln 3+ ion from both py-macrodipa and macrodipa. [54][55][56] With the large excess of DTPA used, this reaction follows pseudo-first-order kinetics, enabling us to use readily determined half-lives (t 1/2 ) as a comparative measure of the complex kinetic stability. These t 1/2 values are listed in Table 2.…”

Section: Dtpa Transchelation Challenge Assaysmentioning

confidence: 99%

Py-Macrodipa: A Janus Chelator Capable of Binding Medicinally Relevant Rare-Earth Radiometals of Disparate Sizes

Aluicio‐Sarduy

Brown

et al. 2021

J. Am. Chem. Soc.

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Supporting InformationThe Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/jacs.1c05339. Experimental procedures and supplementary data for syntheses, potentiometric titrations, UV−Vis spectrophotometric titrations, NMR spectroscopy studies, X-ray crystallography studies, DFT calculations, photophysical studies, DTPA transchelation challenges, radiolabeling studies, and human serum challenges (PDF) Crystallographic data for La 3+ −, Lu 3+ −, and Sc 3+ −py-macrodipa complexes (CIF) Geometry outputs for all DFT-optimized structures (ZIP) Accession Codes CCDC 2085495-2085497 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk

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Section: Dtpa Transchelation Challenge Assaysmentioning

confidence: 99%

Py-Macrodipa: A Janus Chelator Capable of Binding Medicinally Relevant Rare-Earth Radiometals of Disparate Sizes

Aluicio‐Sarduy

Brown

et al. 2021

J. Am. Chem. Soc.

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“…Afterward, the oxidation process was conducted to change Cerium trivalent (Ce 3+ ) to Cerium Tetravalent (Ce 4+ ) which has the lowest Ksp value that is insoluble and easier to precipitate than other RE in feed [15,17]. The oxidation process was carried out by adding Potassium Permanganate for 75 minutes at 80 o C conditions.…”

Section: Resultsmentioning

confidence: 99%

Preliminary Study of the Effect of pH on Ce, Nd, La, Pr Recovery from REOH Concentrate

Perwira,

Aziz,

Basuki

et al. 2024

MSF

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The separation of uranium, thorium, and rare earth elements (REE) from monazite sand was carried out using the PLUTHO pilot plant facility. The REEs were produced in the form of hydroxide concentrates (REOH). Further separation process must be carried out to obtain high-purity elements for application in advanced industries such as polisher material for hard materials, infrared protective glass, and Ni-metal hydride batteries. The Major Element of REEs are Cerium (Ce), Lanthanum (La), Neodynium (Nd), and Praseodymium (Pr). Those elements can be separated by various methods such as fractional precipitation, extraction, ion exchange, and others. This research was carried out using the Fractional Precipitation method. Rare earth elements have chemical properties that permit ready dissolution and easy precipitation. The fractional precipitating reagent commonly used is NH4OH because it will not contaminate the precipitate due to the volatility of NH3. The parameter used in this preliminary study was pH from 4 to 9. The separation process was started with the dissolution of the REOH concentrate in a solution of HNO3 to obtain RE nitrate. After the dissolution process, oxidation and precipitation were carried out by the addition of KMnO4 as an oxidizing agent and Na2CO3 as a precipitating agent at pH 4 to obtain high recovery efficiency of cerium. The precipitation was pH varies continued by pH adjustment using NH4OH starting from pH 4 to pH 9 to separate La, Nd, and Pr. The analysis of Ce, La, Nd, and Pr concentration was carried out using ICP-OES. The optimum pH recovery for Ce, Nd, and Pr was found at pH 4 with a concentration of 19986.4 ppm, 3532.34 ppm, and 3796.81 ppm, respectively, while at pH 8.5 for La with a concentration of 5846.59 ppm.

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Cited by 2 publications

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Py-Macrodipa: A Janus Chelator Capable of Binding Medicinally Relevant Rare-Earth Radiometals of Disparate Sizes

Py-Macrodipa: A Janus Chelator Capable of Binding Medicinally Relevant Rare-Earth Radiometals of Disparate Sizes

Preliminary Study of the Effect of pH on Ce, Nd, La, Pr Recovery from REOH Concentrate

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