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[Ti]

Fischer1, Young Jr, Ellis

  • 1Department of Chemistry University of Minnesota Minneapolis, MN 55455 (USA).

Angewandte Chemie (International Ed. in English)
|January 29, 2000
PubMed
Summary

Researchers discovered a novel tridentate binding of borohydride (BH(4)(-)) to a zero-valent metal center for the first time. This finding led to the synthesis of the first metal(0) pyrrolyl complex.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Synthesis

Background:

  • Borohydride (BH(4)(-)) typically acts as a ligand in coordination complexes.
  • Zero-valent metal complexes are crucial in catalysis and synthesis.
  • The coordination modes of BH(4)(-) to metal centers are diverse but tridentate binding to zero-valent metals was previously unknown.

Purpose of the Study:

  • To investigate the coordination behavior of borohydride (BH(4)(-)) with zero-valent metal centers.
  • To synthesize and characterize novel organometallic complexes involving titanium.
  • To explore the reactivity of metal-borohydride complexes and synthesize metal(0) pyrrolyl complexes.

Main Methods:

  • Synthesis of the carbonyl metalate anion [Ti(CO)(6)](2-).
  • Reaction of [Ti(CO)(6)](2-) with borane tetrahydrofuran complex (BH(3)·THF) to form [Ti(CO)(4)(eta(3)-BH(4))](-).
  • Displacement of the borohydride ligand with a pyrrolyl anion to yield [Ti(CO)(4)(eta(5)-C(4)H(4)N)](-).

Main Results:

  • First observation of tridentate binding of BH(4)(-) to a zero-valent metal center in [Ti(CO)(4)(eta(3)-BH(4))](-).
  • Successful synthesis of the titanium-borohydride complex from [Ti(CO)(6)](2-) and BH(3)·THF.
  • Characterization of the first metal(0) pyrrolyl complex, [Ti(CO)(4)(eta(5)-C(4)H(4)N)](-), via ligand displacement.

Conclusions:

  • The study demonstrates a novel coordination mode for borohydride with zero-valent metals.
  • The synthesized titanium-borohydride complex serves as a precursor for new organometallic compounds.
  • This work expands the scope of metal(0) complexes and their ligand diversity.

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