Abstract
Small size benzo-substituted crown ethers are attractive complexing agents for lithium isotope separation by solvent extraction. Low transfer of the crown ethers from solvent to water is a key point for applicability of the extractants. In the present study, 9- and 12-membered crown ethers were synthesized, and their distribution between chloroform and water was studied. Polyether ring size, benzene substituents and addition of LiCl to water were found to effect on distribution constants. Low losses of the macrocycles were observed at single-stage contact with aqueous phase. However, these losses should be taken into account in the design of multistage processes for the preparation of highly enriched lithium isotopes.
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Acknowledgements
We thank Dr. N.A. Shmakova for performing the IR measurements. The work at Enikolopov Institute of Synthetic Polymer Materials was financially supported by The Federal Agency for Scientific Organizations (FASO Russia) under contract 115060840014, synthesis of the crown ethers was carried out at Topchiev Institute of Petrochemical Synthes within the framework of State Program supported by FASO Russia.
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Procedure of DB12C4 synthesis, NMR spectra of B9C3, B12C4 and DB12C4 (Figures S1–S10), Tables S1 (λmax and ε), Figures S11, S13 (UV–Vis spectra of CE solutions) and Figure S12 (calibration curves). Supplementary material 1 (PDF 1298 kb)
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Zakurdaeva, O.A., Asachenko, A.F., Topchiy, M.A. et al. Distribution of benzo-substituted crown-ethers between chloroform and water: effects of macrocycle ring size and lithium chloride. J Radioanal Nucl Chem 316, 535–541 (2018). https://doi.org/10.1007/s10967-018-5773-9
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DOI: https://doi.org/10.1007/s10967-018-5773-9