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Vanadium(III) and vanadium(V) amine tris(phenolate) complexes.

Stanislav Groysman1, Israel Goldberg, Zeev Goldschmidt

  • 1School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.

Inorganic Chemistry
|July 7, 2005
PubMed
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This study introduces new vanadium complexes with amine tris(phenolate) ligands, exploring their coordination chemistry and catalytic activity in olefin epoxidation, serving as models for vanadium-dependent haloperoxidase enzymes.

Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Vanadium complexes are crucial in catalysis and biological systems.
  • Amine tris(phenolate) ligands offer tunable steric and electronic properties.
  • Understanding vanadium speciation is key for designing efficient catalysts.

Purpose of the Study:

  • To synthesize and characterize novel vanadium(III) and vanadium(V) complexes with amine tris(phenolate) ligands.
  • To investigate the structural and electronic effects of ligand substituents on vanadium coordination.
  • To evaluate the catalytic activity of these complexes in olefin epoxidation.

Main Methods:

  • Synthesis of V(III) and V(V) complexes using VCl3(THF)3 and VO(OPr)3.
  • Characterization via X-ray crystallography and 1H NMR spectroscopy.

Related Experiment Videos

  • Catalytic testing for olefin epoxidation using tert-butyl hydroperoxide.

    • Main Results:

    • Pentacoordinate V(III) complexes with trigonal bipyramidal (TBP) geometry were obtained.
    • V(V) oxo complexes were synthesized, with some accessible via air oxidation of V(III) precursors.
    • Complex 6 exhibited TBP and octahedral equilibria, with the octahedral form favored at lower temperatures.
    • Complexes 4-6 showed slow catalytic activity in olefin epoxidation.

    Conclusions:

    • Amine tris(phenolate) ligands provide a versatile platform for vanadium coordination chemistry.
    • The steric and electronic properties of the ligands influence complex structure and reactivity.
    • These vanadium complexes serve as valuable structural and functional models for vanadium-dependent haloperoxidase enzymes.