Coordination of trivalent lanthanides with bismalonamide ligands: implications for liquid-liquid extraction

Mikhail Tyumentsev, Mark R. St. J. Foreman, Alexandra M. Z. Slawin, David B. Cordes, Otto Savolainen, Rikard Ylmén, Britt-Marie Steenari, Christian Ekberg

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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 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 the structures 2, 3 and 5 and bidentate in 4 only. It was found that the 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 the metal ions with this type of ligands.
Original languageEnglish
Pages (from-to)4285-4298
JournalEuropean Journal of Inorganic Chemistry
Volume2017
Issue number37
Early online date6 Oct 2017
DOIs
Publication statusPublished - Oct 2017

Keywords

  • Lanthanides
  • Bismalonamides
  • Single-crystal X-ray diffraction
  • Electrospray ionization - mass spectrometry
  • Liquid-liquid extraction

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