2-Thiopheneacetato-based one-dimensional coordination polymer of Tb 3+: Enhancement of terbium-centered luminescence in the presence of bidentate nitrogen donor ligands

Shyni Raphael, M. L.P. Reddy, Alan H. Cowley, Michael Findlater

Research output: Contribution to journalArticle

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Abstract

Four new lanthanide(III) complexes of 2-thiopheneacetic acid (HTPAC), [Tb(TPAC)3·H2O]n (1), [Gd(TPAC)3· H2O]n (2), [Tb(TPAC)3(phen)]2 (3) and [Tb(TPAC)3(bath)]2 (4) (phen = 1,10-phenanthroline; bath = bathophenanthroline) have been synthesized and characterized by various spectroscopic techniques. The X-ray structure of 1 reveals that each Tb 3+ ion is connected to two neighboring ions by six thiopheneacetic acid ligands via the carboxylate groups to form an infinite one-dimensional polymer. The unit cell contains only one independent crystallographic site for the Tb ions. The carboxylate groups of the six molecules of the thiopheneacetate ligands are coordinated in both bidentate bridging and tridentate chelate-bridging modes. Each Tb3+ ion is coordinated by nine oxygen atoms in an overall distorted tricapped trigonal-prismatic geometry. Eight of the oxygen atoms are furnished by the carboxylate moieties, and the remaining oxygen atom is provided by the water molecule. The photophysical properties of these complexes in the solid state at room temperature have been investigated. The quantum yields of 3 (4.43 ± 0.44%) and 4 (9.06 ± 0.90%) were found to be significantly enhanced by the presence of the bidentate nitrogen donor ligands in comparison with that of 1 (0.07 ± 0.01%) due to effective energy transfer from the secondary ligands.

Original languageEnglish
Pages (from-to)4387-4394
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number28
DOIs
StatePublished - Oct 2008

Keywords

  • 1D coordination polymer
  • 2-Thiopheneacetic acid
  • Bidentate nitrogen donors
  • Enhanced terbium luminescence

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