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Divalent Thulium Triflate: A Structural and Spectroscopic Study.

Mathieu Xémard1, Arnaud Jaoul1, Marie Cordier1

  • 1LCM, Ecole polytechnique, CNRS, Université Paris-Saclay, Route de Saclay, 91128, Palaiseau cedex, France.

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|March 2, 2017
PubMed
Summary

Researchers report the first molecular thulium(II) luminescence and EPR studies. A new, stable thulium(II) complex offers a promising starting point for exploring divalent lanthanide chemistry in catalysis.

Keywords:
EPR spectroscopyNIR emission spectroscopylanthanidesmagnetismthulium

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Area of Science:

  • Coordination Chemistry
  • Lanthanide Chemistry
  • Organometallic Chemistry

Background:

  • Divalent lanthanide complexes are valuable for small-molecule activation and organic transformations.
  • These complexes are typically unstable and difficult to synthesize, limiting electronic property exploration.

Purpose of the Study:

  • To report the first molecular thulium(II) luminescence and electron paramagnetic resonance (EPR) measurements.
  • To synthesize and characterize a novel, stable divalent thulium complex, [Tm(μ-OTf)2(dme)2]n.
  • To compare the electronic structure of the new complex with its halide analog, TmI2(dme)3.

Main Methods:

  • Synthesis of [Tm(μ-OTf)2(dme)2]n.
  • X-ray diffraction analysis for structural characterization.
  • Molecular luminescence spectroscopy.
  • Magnetic, X-band, and Q-band electron paramagnetic resonance (EPR) studies.

Main Results:

  • Successful synthesis and structural characterization of the rare divalent thulium complex [Tm(μ-OTf)2(dme)2]n.
  • First reported molecular thulium(II) luminescence data.
  • Rare magnetic, X-band, and Q-band EPR studies on a divalent thulium complex.
  • Comparison of the electronic structure with TmI2(dme)3.

Conclusions:

  • The synthesized [Tm(μ-OTf)2(dme)2]n complex is a stable and simple coordination compound of divalent thulium.
  • This complex serves as a promising precursor for developing more intricate divalent lanthanide complexes.
  • The study provides crucial insights into the electronic properties of divalent thulium compounds.