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Covalent Three-Dimensional Titanium(IV)-Aryloxide Networks.

Thomas P. Vaid1, Joseph M. Tanski, John M. Pette

  • 1Cornell University, Baker Laboratory, Department of Chemistry & Chemical Biology, Ithaca, New York 14853.

Inorganic Chemistry
|October 24, 2001
PubMed
Summary
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Titanium isopropoxide reacts with hydroquinone and dihydroxynaphthalene to form novel 3D titanium-organic frameworks with dititanium building blocks.

Area of Science:

  • Materials Chemistry
  • Inorganic Chemistry
  • Crystallography

Background:

  • Titanium alkoxides are versatile precursors for synthesizing titanium-containing materials.
  • Hydroquinone and its derivatives are valuable organic ligands for metal complexation.
  • The development of novel 3D coordination polymers and metal-organic frameworks is an active area of research.

Purpose of the Study:

  • To synthesize and characterize new titanium-organic materials using hydroquinone and 2,7-dihydroxynaphthalene.
  • To investigate the structural diversity and dimensionality of the resulting titanium complexes.
  • To explore the crystallization behavior of titanium alkoxides with phenolic ligands.

Main Methods:

  • Reaction of titanium isopropoxide with hydroquinone and 2,7-dihydroxynaphthalene in various solvents.

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  • Isolation and purification of solid products.
  • Single-crystal X-ray diffraction analysis to determine crystal structures.
  • Characterization of materials using spectroscopic methods (implied by quenching studies).

    • Main Results:

    • Formation of three distinct titanium-organic materials (1, 2, 4, and 5) with varying structures and compositions.
    • Compounds 2, 4, and 5 were characterized as 3D coordination polymers based on dititanium building blocks.
    • Crystal structures revealed different packing arrangements, including body-centered and hexagonal motifs.
    • The solvent and presence of water influenced the final product structure and composition.

    Conclusions:

    • The reaction of titanium isopropoxide with phenolic ligands offers a route to diverse 3D titanium-organic materials.
    • The connectivity and arrangement of dititanium units dictate the overall framework structure.
    • Crystallization through alcoholysis is a key factor in controlling the formation of these materials.