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Lithium amidohydridoaluminates.

J Pauls1, B Neumüller

  • 1Fachbereich Chemie der Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany.

Inorganic Chemistry
|February 24, 2001
PubMed
Summary
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New amidohydridometalates were synthesized and characterized. Structural analyses revealed distorted tetrahedral coordination spheres for the anions, with a notable Li-H interaction in one compound.

Area of Science:

  • Organometallic Chemistry
  • Inorganic Synthesis
  • Coordination Chemistry

Background:

  • Amidohydridometalates are compounds containing metal-hydride and metal-amide bonds.
  • Lithium aluminum hydride (LiAlH4) is a versatile reagent in organic and inorganic synthesis.
  • Understanding the coordination chemistry of these complexes is crucial for their reactivity.

Purpose of the Study:

  • To synthesize novel amidohydridometalate complexes.
  • To characterize the structural and bonding properties of these new compounds.
  • To investigate the coordination environment around the metal centers.

Main Methods:

  • Reaction of amines with lithium aluminum hydride (LiAlH4) in tetrahydrofuran (THF).
  • Recrystallization for obtaining suitable crystals for analysis.

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  • Characterization using elemental analyses, IR, NMR, and MS techniques.
  • X-ray structure analyses to determine molecular geometry.

    • Main Results:

    • Three new amidohydridometalates, [Li(THF)4][HAl(NPh2)3] (1), [Li(DME)3][HAl(N(CH2Ph)2)3] (2), and [((THF)3Li)-(H2Al(NcHex2)2)].0.5toluene (3), were successfully prepared.
    • X-ray diffraction studies revealed distorted tetrahedral coordination spheres for the anions in compounds 1, 2, and 3.
    • A significant Li...H contact (184(4) pm) was observed in compound 3, completing the tetrahedral coordination of the Li+ center.

    Conclusions:

    • The synthesis yielded novel amidohydridometalates with unique structural features.
    • The coordination geometry around the aluminum and lithium centers is primarily tetrahedral, albeit distorted.
    • The observed Li-H interaction highlights potential intra- or intermolecular bonding in related systems.