Stoichiometric Lanthanide Compounds with Diglycolamides
The date of：
2024-11-08
viewed:
0
Stoichiometric Lanthanide Compounds with Diglycolamides: A Synthetic Approach toward Understanding Rare-Earth Speciation in Solution
A fundamental understanding of coordination chemistry across the lanthanide series is essential for explaining the chemical behavior of rare-earth metals in complex liquid–liquid extraction processes. Probing the exact bonding between the extractant and the metal is sometimes done through the synthesis of solid-state compounds that can serve as models for metal speciation in solution. In the case of diglycolamide (DGA), a commonly used neutral diamide extractant, extensive studies identify the stepwise formation of 1:1 [Ln(DGA)(H2O)6]3+, 1:2 [Ln(DGA)2(H2O)3]3+, and 1:3 [Ln(DGA)3]3+ complexes in solution. The crystallographic reports, however, exclusively show a 1:3 [Ln(DGA)3]3+ moiety in the solid state, while the structures of 1:1 and 1:2 complexes are yet to be isolated and comprehensively studied. In this work, we report the synthesis and characterization of three new families of stoichiometric N,N,N′,N’-tetramethyldiglycolamide (TMDGA) compounds: [Ln(TMDGA)(H2O)5Cl]Cl2·2H2O, [Ln(TMDGA)2(H2O)3]Cl3·3H2O, and [Ln(TMDGA)3]Cl3·7H2O, where Ln = Nd, Eu, Gd, with Ln:TMDGA ratios of 1:1, 1:2, and 1:3, respectively. The compounds have been analyzed using vibrational spectroscopy (both Raman and FT-IR), as well as variable temperature fluorescence spectroscopy. A spectrophotometric titration of Eu(III) was performed to confirm the presence of the [Eu(TMDGA)n]3+ (n = 1, 2, and 3) species in solution and to compare the individual solid-state emission spectra to their respective analogues in solution.
Hot News
/
Related to recommend
2025
-
04
-
25
Click on the number of times:
0
source:ACS PubicationsRare-earth adatoms on surfaces have been studied for potential atomic-scale magnetic storage, quantum sensing, and quantum computing applications. Despite accumulating experiment...
2025
-
04
-
24
Click on the number of times:
0
source:National Research University Higher School of EconomicsResearchers at HSE University and the Institute of Petrochemical Synthesis of the Russian Academy of Sciences have discovered a way to con...
2025
-
04
-
23
Click on the number of times:
0
source:msnWestern Digital says it's created an initiative to retrieve rare earth metals from hard drives that are being cycled out of data centers.The tech company, best known for its digital stor...
2025
-
04
-
22
Click on the number of times:
0
source:TRELLISMicrosoft is expanding electronic waste collection from its data centers with a new initiative to recover rare earth elements and precious metals from hard drives without using acids.The...