Influence of Electronic Modulation of Phenanthroline-Derived Ligands on Separation of Lanthanides and Actinides

Ming-Ming Li; Xiao-Juan Liu; Qi Yang; Yue-Kun Liu; Jiang Nie; Shu-Ming Yang; Ya-Ya Yang; Fu-Yan Lou; Song-Tao Xiao; Ying-Gen Ouyang; Guo-An Ye

doi:10.3390/molecules27061786

Molecules (Mar 2022)

Influence of Electronic Modulation of Phenanthroline-Derived Ligands on Separation of Lanthanides and Actinides

Ming-Ming Li,
Xiao-Juan Liu,
Qi Yang,
Yue-Kun Liu,
Jiang Nie,
Shu-Ming Yang,
Ya-Ya Yang,
Fu-Yan Lou,
Song-Tao Xiao,
Ying-Gen Ouyang,
Guo-An Ye

Affiliations

Ming-Ming Li: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Xiao-Juan Liu: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Qi Yang: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Yue-Kun Liu: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Jiang Nie: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Shu-Ming Yang: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Ya-Ya Yang: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Fu-Yan Lou: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Song-Tao Xiao: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Ying-Gen Ouyang: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China
Guo-An Ye: Department of Radiochemistry, China Institute of Atomic Energy, P.O. Box 275, Beijing 102413, China

DOI: https://doi.org/10.3390/molecules27061786
Journal volume & issue: Vol. 27, no. 6
p. 1786

Abstract

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The solvent extraction, complexing ability, and basicity of tetradentate N-donor 2,9-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-1,10-phenanthroline (CyMe4-BT- Phen) and its derivatives functionalized by Br, hydroxyphenyl, nitryl were discussed and compared. It was demonstrated that four BTPhen ligands are able to selectively extract Am(lll) over Eu(lll). It was notable that the distribution ratio of 5-nitryl-CyMe4-BTPhen for Eu(lll) was suppressed under 0.02, which was much lower compared to DEu(lll) = 1 by CyMe4-BTPhen. The analysis of the effect of the substituent on the affinity to lanthanides was conducted by UV/vis and fluorescence spectroscopic titration. The stability constants of various ligands with Eu(lll) were obtained by fitting titration curve. Additionally, the basicity of various ligands was determined to be 3.1 ± 0.1, 2.3 ± 0.2, 0.9 ± 0.2, 0.5 ± 0.1 by NMR in the media of CD3OD with the addition of DClO4. The basicity of ligands follows the order of L1 > L2 > L3 > L4, indicating the tendency of protonation decreases with the electron-withdrawing ability increase.

Published in Molecules

ISSN: 1420-3049 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/molecules

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