1. Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid-Liquid Extraction.
- Author
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Tyumentsev, Mikhail S., Foreman, Mark R. St. J., Slawin, Alexandra M. Z., Cordes, David B., Savolainen, Otto, Ylmén, Rikard, Steenari, Britt‐Marie, and Ekberg, Christian
- Subjects
RARE earth metals ,COORDINATE covalent bond ,AMIDES ,LIGANDS (Chemistry) ,LIQUID-liquid extraction ,COMPLEXATION reactions - Abstract
The complexation of the bismalonamide ligand 2,2'-[1,2-phenylenebis(methylene)]bis(N,N,N',N'-tetraethylmalonamide) (L), bearing two C-alkylated N,N,N',N'-tetraethylmalonamide groups, onto an ortho-xylylene [C
6 H4 (CH2 )2 ] platform with trivalent lanthanides was investigated, both in solid and solution states. The crystal structures [Nd2 (NO3 )6 L2 ]·(CH3 CN)3 (2), [Nd2 (NO3 )4 L2 ]·[Nd(NO3 )5 ]·(CH3 CN)1.5 (3), Ce(NO3 )3 L2 (4), and [NdL2 ]·(ClO4 )3 ·C2 H5 OH (5) were analyzed by single-crystal X-ray diffraction. The ortho-bismalonamide (L) is tetradentate in structures 2, 3, and 5 and bidentate in 4 only. It was found that structures 2 and 3 are composed of dimeric species. According to electrospray-ionization mass spectrometry, the dimers are prevailing in acetonitrile solutions. The polydentate coordination of the ortho-bismalonamide (L) with trivalent lanthanides suggests that an entropy effect favors liquid-liquid extraction of metal ions with this type of ligand. [ABSTRACT FROM AUTHOR]- Published
- 2017
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