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Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction

Coordination of Trivalent Lanthanides with Bismalonamide Ligands: Implications for Liquid–Liquid Extraction
Christian Ekberg, Otto Savolainen, Mikhail S. Tyumentsev, Britt-Marie Steenari, Alexandra M. Z. Slawin, David B. Cordes, Rikard Ylmén, Mark R. St. J. Foreman
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 [C6H4(CH2)2] platform with trivalent lanthanides was investigated, both in solid and solution states. The crystal structures [Nd2(NO3)6L2]·(CH3CN)3 (2), [Nd2(NO3)4L2]·[Nd(NO3)5]·(CH3CN)1.5 (3), Ce(NO3)3L2 (4), and [NdL2]·(ClO4)3·C2H5OH (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.The dimeric cation [Nd2(NO3)4L2]2+ of the structure [Nd2(NO3)4L2]·[Nd(NO3)5]·(CH3CN)1.5 is presented in the figure (color code: Nd – yellow, O – red, N – blue, C – gray, H – white), where L stands for 2,2′-[1,2-phenylenebis(methylene)]bis(N,N,N′,N′-tetraethylmalonamide). Such a coordination mode is new for complexes of multi-coordinate ligands with trivalent lanthanides.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700801

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