AI Article Synopsis

  • The study focuses on the solvent extraction and complexing ability of tetradentate N-donor ligands, specifically a compound called CyMe4-BT-Phen and its derivatives, including Br, hydroxyphenyl, and nitryl.
  • The ligands were found to selectively extract americium (Am(III)) over europium (Eu(III)), with the derivative 5-nitryl-CyMe4-BTPhen showing significantly lower efficiency for Eu(III) compared to CyMe4-BTPhen.
  • The researchers also analyzed how different substituents affect the ligands' affinity for lanthanides using UV/vis and fluorescence spectroscopy, determining stability constants and basicity,

Article Abstract

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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8949807PMC
http://dx.doi.org/10.3390/molecules27061786DOI Listing

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