Infrared spectra of rare-earth metal, yttrium, and scandium succinates

Azikov, B. S.; Kharzeeva, S. E.; Grankina, Z. A.; Serebrennikov, V.V.

doi:10.1007/bf00843581

Cited by 2 publications

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“…As mentioned briefly, succinic acid represents a weak chelating ligand. Complexation constants (p K C ) of lanthanide ions with the dianionic succinic acid ligand are reported to be in the range of 3.38 (Nd)−4.54 (Er). − It was therefore necessary to maintain the pH at 5.4 ± 0.1, which proved to be the optimum range for quantitative complexation. In the case of a lower pH, the carboxylic acid groups become protonated and are no longer available for complexation.…”

Section: Resultsmentioning

confidence: 99%

Selective Extraction of Rare-Earth Elements from Rocks Using a High-Capacity cis-1,4-Butanedioic Acid-Functionalized Resin

et al. 1998

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A high-capacity carboxylic acid-functionalized resin prepared by ring-opening metathesis polymerization containing cis-1,4-butanedioic acid (succinic acid) units was used for the extraction of rare-earth elements (REEs) from rock digests. Extraction efficiencies measured by means of ICP-AES were found to be in the range of 90−100% for standards containing 5 and 500 ppb of each REE, respectively. The optimum extraction pH was found to be between 5.3 and 5.5. Three different rock standard reference materials (SRMs), GSR-1 granite, GSR-2 andesite, and GSR-3 basalt, were digested by fusion of the corresponding rock with lithium metaborate (LiBO2) and subsequent dissolution in nitric acid. As a consequence of the different compositions of the three investigated SRMs, the resulting digest showed different concentrations of the REEs as well as of SiO2, Fe, Al, Mg, and Ca. The entire extraction procedure was additionally supported by masking of the interfering metal ions using 5-sulfosalicylic acid. Small amounts of methanol were added to prevent silicate from precipitating. Following this setup, REEs occurring in the digest solutions in the range of 40 ppt to 150 ppb were retained selectively, with recoveries ranging for most elements from 75 to 110%. The high performance of the entire system is underlined by the fact that relative standard deviations were <10% for most of the REEs.

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Section: Resultsmentioning

confidence: 99%

Selective Extraction of Rare-Earth Elements from Rocks Using a High-Capacity cis-1,4-Butanedioic Acid-Functionalized Resin

et al. 1998

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“…However few data exist on lanthanide adipates [3]. Stability constants of ion association complexes of several rare earth metal adipates [4][5][6], and a brief thermal dehydration study of Ce2(C6HaO,) 3.2H20 , Eu2(CrHaO4)3"6H20 and Nd2(C6HsO4)a.SH20 [8][9][10] This paper reports the synthesis and characterization of ianthanide (excluding promethium) adipal~e decahydrates and the thermal behaviour of these complexes LnE(C6H804) a 9 10H20 (where Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) is reported and discussed. Thermal stability ranges for these complexes and the corresponding intermediate pyrolysis products are deduced for conditions prevailing.…”

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A thermal analysis study of lanthanide adipate hydrates

Dabkowska

1987

Journal of Thermal Analysis

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The multi-step dehydration and decomposition of trivalent lanthanide adipate hydrates has been investigated by TG, DTG and DTA, together with infrared study of these compounds and the corresponding intermediate decomposition products. X-ray diffraction data for adipate complexes of general stoichiometry Ln2(CrHaO,) 3-10H20 , where Ln = La, Ce, Pr, Nd, Sin, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu are also reported.Adipic acid, HOOC(CH2)4COOH, behaves as dicarboxylic acid and on heating undergoes a variety of transformations such as cyclisation, decarboxylation and polymerization. Adipic acid and adipates are used m the polymer and rood industries. Adipic acid exhibits a sharp melting Point at 424.56 K and is recommended as a temperature standard for DTA calibration [1]. Adipic acid is also used as an analytical reagent for the quantitative precipitation of aluminium, zirconium and uranium [2].Adipic acid functions as bidentate ligand and forms complexes with a wide variety of metals. However few data exist on lanthanide adipates [3]. Stability constants of ion association complexes of several rare earth metal adipates [4][5][6], and a brief thermal dehydration study of Ce2(C6HaO,) 3.2H20 , Eu2(CrHaO4)3"6H20 and Nd2(C6HsO4)a.SH20 [8][9][10] This paper reports the synthesis and characterization of ianthanide (excluding promethium) adipal~e decahydrates and the thermal behaviour of these complexes LnE(C6H804) a 9 10H20 (where Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) is reported and discussed. Thermal stability ranges for these complexes and the corresponding intermediate pyrolysis products are deduced for conditions prevailing.

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Infrared spectra of rare-earth metal, yttrium, and scandium succinates

Cited by 2 publications

References 0 publications

Selective Extraction of Rare-Earth Elements from Rocks Using a High-Capacity cis-1,4-Butanedioic Acid-Functionalized Resin

Selective Extraction of Rare-Earth Elements from Rocks Using a High-Capacity cis-1,4-Butanedioic Acid-Functionalized Resin

A thermal analysis study of lanthanide adipate hydrates

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