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Lanthanoid/Alkali Metal β-Triketonate Assemblies: A Robust Platform for Efficient NIR Emitters.

Brodie L Reid1, Stefano Stagni2, Joanna M Malicka3

  • 1Department of Chemistry and Nanochemistry Research Institute, Curtin University, Kent Street, Bentley 6102 WA (Australia).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 30, 2015
PubMed
Summary

New tetranuclear lanthanoid assemblies using a β-triketonate ligand offer efficient near-infrared (NIR) emission. These lanthanoid complexes provide a simpler route to bright NIR emitters compared to traditional methods.

Keywords:
diketonateslanthanidesluminescencenear-infrared emitterstriketonates

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Luminescence

Background:

  • Lanthanoid complexes are crucial for luminescence applications, particularly in the near-infrared (NIR) spectrum.
  • Traditional synthesis of efficient lanthanoid emitters often requires complex ligand modifications like perfluorination or deuteration.
  • Developing facile synthetic routes to tunable lanthanoid-based luminescent materials remains an active area of research.

Purpose of the Study:

  • To synthesize and characterize novel tetranuclear lanthanoid assemblies using a β-triketonate ligand.
  • To investigate the luminescent properties of these assemblies, focusing on NIR emission efficiency and excited-state lifetimes.
  • To explore the influence of alkali metal ions and lattice solvation on the coordination geometry and luminescence.

Main Methods:

  • Reaction of hydrated lanthanoid chlorides with tribenzoylmethane and alkali metal hydroxides.
  • Crystallization and structural analysis (X-ray diffraction) of the resulting tetranuclear assemblies.
  • Photoluminescence spectroscopy to measure emission spectra, excited-state lifetimes, quantum yields, and sensitization efficiencies.

Main Results:

  • Successfully synthesized neutral tetranuclear lanthanoid assemblies with the general formula [Ln(Ae⋅HOEt)(L)4 ]2.
  • Observed varied coordination geometries (square antiprism to triangular dodecahedron) dependent on alkali metal and solvation.
  • Achieved highly efficient NIR emission for Yb(3+) and Er(3+) assemblies with significantly longer excited-state lifetimes compared to related β-diketonate species.
  • Eu(3+) assemblies exhibited bright red emission with performance comparable to β-diketonate complexes.

Conclusions:

  • The β-triketonate ligand provides a facile and tunable platform for constructing efficient lanthanoid-based luminescent materials.
  • These assemblies demonstrate potential as NIR emitters without requiring complex synthetic modifications.
  • The study highlights a promising strategy for developing advanced luminescent materials for various applications.