3-d Water-soluble reversible neodymium (III) and lanthanum (III) coordination polymers

T. Vermonden, W.M. de Vos, A.T.M. Marcelis, E.J.R. Sudhölter

Research output: Contribution to journalArticleAcademicpeer-review

52 Citations (Scopus)

Abstract

The formation of soluble supramolecular 3-D coordination polymers with Nd3+ and La3+ in aqueous solution has been studied for two bifunctional ligands consisting of two pyridine-2,6-dicarboxylate groups connected at the 4-position by O(CH2CH2O)4 and O(CH2CH2O)6 spacers (C4 and C6, respectively). Viscosity measurements were used to monitor the network formation as a function of the ligand concentration, and the ratio between metal ions and ligands. For corresponding conditions C4 solutions with Nd3+ always gave much higher viscosities than C6 solutions with Nd3+. C6 is long, and flexible enough to bind with both chelating groups to only one metal ion (ring formation). This causes the polymers to stop growing, resulting in smaller average sizes of the 3-D polymers. The ring-structures could be demonstrated by 1H NMR spectroscopy using C6 and La3+ at low concentrations
Original languageEnglish
Pages (from-to)2847-2852
JournalEuropean Journal of Inorganic Chemistry
Volume2004
Issue number14
DOIs
Publication statusPublished - 2004

Keywords

  • crystal-structure
  • complexes

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