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Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents

[Image: see text] Deep eutectic solvents are a new class of green solvents that are being explored as an alternative for used nuclear fuel and critical material recycling. However, there is a paucity of knowledge regarding metal behavior in them. This paper explores the underlying chemistry of rare-...

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Autores principales: Amphlett, James T. M., Lee, Yunu, Yang, Wonseok, Kang, Dokyu, Sung, Nark-Eon, Park, Jaeyeong, Jung, Euo Chang, Choi, Sungyeol
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8756809/
https://www.ncbi.nlm.nih.gov/pubmed/35036756
http://dx.doi.org/10.1021/acsomega.1c05386
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author Amphlett, James T. M.
Lee, Yunu
Yang, Wonseok
Kang, Dokyu
Sung, Nark-Eon
Park, Jaeyeong
Jung, Euo Chang
Choi, Sungyeol
author_facet Amphlett, James T. M.
Lee, Yunu
Yang, Wonseok
Kang, Dokyu
Sung, Nark-Eon
Park, Jaeyeong
Jung, Euo Chang
Choi, Sungyeol
author_sort Amphlett, James T. M.
collection PubMed
description [Image: see text] Deep eutectic solvents are a new class of green solvents that are being explored as an alternative for used nuclear fuel and critical material recycling. However, there is a paucity of knowledge regarding metal behavior in them. This paper explores the underlying chemistry of rare-earth elements in choline chloride-based deep eutectic solvents by using a multi-technique spectroscopic methodology. Results show that speciation is highly dependent on the choice of the hydrogen-bond donor. Collected EXAFS data showed Ln(3+) coordination with ethylene glycol and urea in their respective solvents and coordination with chloride in the lactic acid system. Generalized coordination environments were determined to be [LnL(4–5)], [LnL(7–10)], and [LnL(5–6)] in the ethylene glycol, urea, and lactic acid systems, respectively. Collected UV/vis spectra for Nd(3+) and Er(3+) showed variations with changing solvents, showing that Ln–Cl interactions do not dominate in these systems. Luminescence studies were consistent, showing varying emission spectra with varying solvent systems. The shortest luminescent lifetimes were observed in the choline chloride–ethylene glycol deep eutectic solvent, suggesting coordination through O–H groups. Combining all collected data allowed Eu(3+) coordination geometries to be assigned.
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spelling pubmed-87568092022-01-13 Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents Amphlett, James T. M. Lee, Yunu Yang, Wonseok Kang, Dokyu Sung, Nark-Eon Park, Jaeyeong Jung, Euo Chang Choi, Sungyeol ACS Omega [Image: see text] Deep eutectic solvents are a new class of green solvents that are being explored as an alternative for used nuclear fuel and critical material recycling. However, there is a paucity of knowledge regarding metal behavior in them. This paper explores the underlying chemistry of rare-earth elements in choline chloride-based deep eutectic solvents by using a multi-technique spectroscopic methodology. Results show that speciation is highly dependent on the choice of the hydrogen-bond donor. Collected EXAFS data showed Ln(3+) coordination with ethylene glycol and urea in their respective solvents and coordination with chloride in the lactic acid system. Generalized coordination environments were determined to be [LnL(4–5)], [LnL(7–10)], and [LnL(5–6)] in the ethylene glycol, urea, and lactic acid systems, respectively. Collected UV/vis spectra for Nd(3+) and Er(3+) showed variations with changing solvents, showing that Ln–Cl interactions do not dominate in these systems. Luminescence studies were consistent, showing varying emission spectra with varying solvent systems. The shortest luminescent lifetimes were observed in the choline chloride–ethylene glycol deep eutectic solvent, suggesting coordination through O–H groups. Combining all collected data allowed Eu(3+) coordination geometries to be assigned. American Chemical Society 2021-12-21 /pmc/articles/PMC8756809/ /pubmed/35036756 http://dx.doi.org/10.1021/acsomega.1c05386 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Amphlett, James T. M.
Lee, Yunu
Yang, Wonseok
Kang, Dokyu
Sung, Nark-Eon
Park, Jaeyeong
Jung, Euo Chang
Choi, Sungyeol
Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title_full Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title_fullStr Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title_full_unstemmed Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title_short Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents
title_sort spectroscopic study into lanthanide speciation in deep eutectic solvents
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8756809/
https://www.ncbi.nlm.nih.gov/pubmed/35036756
http://dx.doi.org/10.1021/acsomega.1c05386
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