Exploring the Subtle Effect of Aliphatic Ring Size on Minor Actinide Extraction Properties and Metal Ion Speciation in Bis‐1,2,4‐Triazine Ligands

Zaytsev, Andrey, Bulmer, Rachel, Kozhevnikov, Valery, Sims, Mark, Modolo, Giuseppe, Wilden, Andreas, Waddell, Paul, Geist, Andreas, Panak, Petra, Wessling, Patrik and Lewis, Frank (2020) Exploring the Subtle Effect of Aliphatic Ring Size on Minor Actinide Extraction Properties and Metal Ion Speciation in Bis‐1,2,4‐Triazine Ligands. Chemistry: A European Journal, 26 (2). pp. 428-437. ISSN 0947-6539

[img]
Preview
Text (Final published version)
chem.201903685.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (1MB) | Preview
[img]
Preview
Text (Advance online version)
Zaytsev_et_al-2019-Chemistry_-_A_European_Journal.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (1MB) | Preview
[img] Text
Zaytsev et al - Exploring the Subtle Effect of Aliphatic Ring Size on Minor Actinide Extraction Properties and Metal Ion Speciation in Bis‐1,2,4‐Triazine Ligands AAM.pdf - Accepted Version
Restricted to Repository staff only until 5 September 2020.

Download (772kB) | Request a copy
Official URL: https://doi.org/10.1002/chem.201903685

Abstract

The synthesis and evaluation of three novel bis‐1,2,4‐triazine ligands containing five‐membered aliphatic rings are reported. Compared to the more hydrophobic ligands 1–3 containing six‐membered aliphatic rings, the distribution ratios for relevant f‐block metal ions were approximately one order of magnitude lower in each case. Ligand 10 showed an efficient, selective and rapid separation of AmIII and CmIII from nitric acid. The speciation of the ligands with trivalent f‐block metal ions was probed using NMR titrations and competition experiments, time‐resolved laser fluorescence spectroscopy and X‐ray crystallography. While the tetradentate ligands 8 and 10 formed LnIII complexes of the same stoichiometry as their more hydrophobic analogues 2 and 3, significant differences in speciation were observed between the two classes of ligand, with a lower percentage of the extracted 1:2 complexes being formed for ligands 8 and 10. The structures of the solid state 1:1 and 1:2 complexes formed by 8 and 10 with YIII, LuIII and PrIII are very similar to those formed by 2 and 3 with LnIII. Ligand 10 forms CmIII and EuIII 1:2 complexes that are thermodynamically less stable than those formed by ligand 3, suggesting that less hydrophobic ligands form less stable AnIII complexes. Thus, it has been shown for the first time how tuning the cyclic aliphatic part of these ligands leads to subtle changes in their metal ion speciation, complex stability and metal extraction affinity.

Item Type: Article
Uncontrolled Keywords: actinide, triazine ligand, spent nuclear fuel, solvent extraction, lanthanide
Subjects: F100 Chemistry
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Paul Burns
Date Deposited: 13 Sep 2019 10:33
Last Modified: 10 Apr 2020 17:45
URI: http://nrl.northumbria.ac.uk/id/eprint/40677

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics