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From clusters to ionic complexes: structurally characterized thallium titanium double alkoxides.

Timothy J Boyle1, Cecilia A Zechmann, Todd M Alam

  • 1Advanced Materials Laboratory, Sandia National Laboratories, Albequerque, New Mexico 87106, USA. tjboyle@sandia.gov

Inorganic Chemistry
|February 19, 2002
PubMed
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This study synthesized novel titanium-thallium alkoxide complexes with varying steric bulk. Structural analysis revealed diverse nuclearities and coordination geometries, with (205)Tl NMR confirming solution behavior consistent with solid-state structures.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Titanium alkoxides and thallium alkoxides are versatile precursors in inorganic synthesis.
  • Understanding the reactivity and structural diversity of mixed-metal alkoxide complexes is crucial for developing new materials and catalysts.

Purpose of the Study:

  • To synthesize and characterize novel titanium-thallium alkoxide complexes with systematically varied steric hindrance.
  • To investigate the structural diversity, including nuclearity and coordination geometry, of these mixed-metal compounds.
  • To explore the solution-state behavior of the synthesized complexes using (205)Tl NMR spectroscopy.

Main Methods:

  • Reaction of sterically varied titanium alkoxides with thallium alkoxides.
  • X-ray diffraction analysis for structural determination of crystalline products.

Related Experiment Videos

  • (205)Tl Nuclear Magnetic Resonance (NMR) spectroscopy for solution behavior analysis.

    • Main Results:

    • Synthesis of novel titanium-thallium alkoxide complexes with varying nuclearities (dinuclear, trinuclear, tetranuclear).
    • X-ray crystallography revealed diverse structures, including oxo-bridged complexes (1, 2) and non-oxo trinuclear (3, 4, 5) and dinuclear (6) species.
    • A unique ionic compound (7) featuring a "naked" thallium cation with pi-interactions was isolated.
    • (205)Tl NMR spectra correlated with solid-state structures, indicating ligand rearrangement sensitivity.

    Conclusions:

    • Steric bulk of alkoxide ligands significantly influences the nuclearity and structure of titanium-thallium alkoxide complexes.
    • The study demonstrates a versatile synthetic route to a range of novel mixed-metal alkoxide structures.
    • (205)Tl NMR is a valuable tool for probing the solution behavior and structural integrity of these thallium-containing compounds.