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Ortho-linked polyaryloxide ligands and their titanium complexes.

A Kayal1, A F Ducruet, S C Lee

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

Inorganic Chemistry
|February 24, 2001
PubMed
Summary

New multidentate polyaryloxide ligands, quaterphenol L(OH)4 and terphenol PhL(OH)3, were synthesized and used in titanium coordination chemistry. These ligands form diverse bridged titanium structures, showcasing their versatility in transition-metal applications.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Ligand Design

Background:

  • Development of novel multidentate ligands is crucial for advancing transition-metal chemistry.
  • Polyaryloxide ligands offer unique steric and electronic properties for metal coordination.
  • Titanium's diverse oxidation states and coordination numbers make it an ideal metal center for exploring new ligand systems.

Purpose of the Study:

  • To synthesize and characterize novel ortho-linked polyphenols, quaterphenol L(OH)4 and terphenol PhL(OH)3, as multidentate ligands.
  • To investigate the coordination chemistry of these ligands with Ti(IV) and Ti(III) precursors.
  • To explore the structural diversity and coordination behavior of titanium complexes formed with these polyaryloxide ligands.

Main Methods:

Related Experiment Videos

  • Synthesis of polyphenols via ortho-metalation and metal-catalyzed cross-coupling.
  • Coordination of ligands with Ti(IV) and Ti(III) precursors.
  • Structural characterization of resulting titanium complexes using X-ray crystallography.

    • Main Results:

    • Successful synthesis of quaterphenol L(OH)4 and terphenol PhL(OH)3 ligands with tunable properties.
    • Formation of diverse bridged Ti(IV) structures, including dimeric and trimeric complexes.
    • Observation of Ti(III) oxidation to Ti(IV) in the presence of THF solvent, forming an oxo-bridged dimer.
    • Titanium centers exhibit 5- or 6-coordinate geometries, with ligands bridging multiple titanium sites.

    Conclusions:

    • Ortho-linked polyphenols are effective multidentate ligands for titanium.
    • The synthetic flexibility allows for tailored ligand properties.
    • The ligands facilitate the formation of complex bridged titanium structures with varying coordination geometries.