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The first structurally characterized cationic lanthanide-alkyl complexes.

Stefan Arndt1, Thomas P Spaniol, Jun Okuda

  • 1Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, Duesbergweg 10-14, D-55099 Mainz, Germany.

Chemical Communications (Cambridge, England)
|July 19, 2002
PubMed
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Rare earth metal complexes react with boron compounds and crown ethers to form novel ion pairs. These compounds were characterized using X-ray crystallography, revealing unique structural arrangements.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Rare earth metal-alkyl complexes are versatile precursors in synthesis.
  • Boron compounds, particularly triarylboranes, are important Lewis acids.
  • Crown ethers are known for their ability to coordinate metal cations.

Purpose of the Study:

  • To investigate the reaction of rare earth metal-alkyl complexes with triarylboranes in the presence of crown ethers.
  • To synthesize and characterize novel ion pair compounds.
  • To explore the structural diversity of these complexes.

Main Methods:

  • Synthesis of rare earth metal-alkyl complexes [Ln(CH2SiMe3)3(THF)2] (Ln = Y, Lu).
  • Reaction with triarylboranes B(C6X5)3 (X = H, F) and crown ethers (CE).

Related Experiment Videos

  • Crystallographic characterization of the resulting ion pairs [Ln(CH2SiMe3)2(CE)(THF)n]+[B(CH2SiMe3)(C6X5)3]-.

    • Main Results:

    • Formation of ion pairs involving rare earth metal cations and boron-based anions.
    • Structural characterization revealed varying coordination numbers for the metal center depending on the crown ether size.
    • The crown ether ([12]-crown-4, [15]-crown-5, [18]-crown-6) influences the number of THF ligands (n) coordinated to the metal.
    • Crystallographically characterized ion pairs: [Ln(CH2SiMe3)2(CE)(THF)n]+[B(CH2SiMe3)(C6X5)3]-.

    Conclusions:

    • The reaction provides a route to novel rare earth metal-containing ion pairs.
    • Crown ether size plays a crucial role in determining the structure and coordination of the rare earth metal complex.
    • This study expands the understanding of rare earth element coordination chemistry and ion pair formation.