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Divalent samarium compounds with heavier chalcogenolate (EPh; E = Se, Te) ligands.

D Freedman1, A Kornienko, T J Emge

  • 1Department of Chemistry, Rutgers, State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, USA.

Inorganic Chemistry
|January 16, 2003
PubMed
Summary
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Researchers synthesized novel samarium coordination complexes. A heterometallic polymer of samarium and zinc selenolates was formed, alongside a stable samarium tellurolate pyridine complex, expanding knowledge of f-element organometallic chemistry.

Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Samarium complexes with EPh ligands (E = Se, Te) are of interest for their unique coordination properties.
  • Understanding the stability and structure of these complexes is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize crystalline coordination complexes of samarium with selenolate and tellurolate ligands.
  • To investigate the formation of heterometallic complexes and their structural features.

Main Methods:

  • Synthesis of Sm(SePh)2 and Sm(TePh)2 complexes.
  • Formation of a heterometallic 1D coordination polymer with Zn(SePh)2.
  • Characterization using spectroscopic methods (e.g., NMR, IR).
  • Single-crystal X-ray diffraction for structural determination of the polymer.

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Main Results:

  • Sm(SePh)2 is unstable in solution but forms a stable heterometallic 1D coordination polymer, [(THF)3Sm(mu 2-SePh)3Zn(mu 2-SePh)]n, in the presence of Zn(SePh)2.
  • The polymer features alternating Sm(II) and Zn(II) ions bridged by selenolate ligands, with THF coordinated to samarium.
  • The tellurolate complex, (py)5Sm(TePh)2, is stable and isostructural with analogous Eu and Yb compounds.
  • Detailed crystal structure data for both compounds were obtained.

Conclusions:

  • The study successfully synthesized and characterized novel samarium coordination complexes.
  • The formation of a stable heterometallic polymer highlights the utility of co-crystallization strategies for unstable organometallic compounds.
  • The structural and spectroscopic data provide valuable insights into the coordination chemistry of samarium with chalcogenolate ligands.