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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Isomerism in Complexes
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Cobalt Boryl Complexes: Enabling and Exploiting Migratory Insertion in Base-Metal-Mediated Borylation.

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Angewandte Chemie (International Ed. in English)
|June 30, 2015
PubMed
Summary

Cobalt boryl complexes show controllable M-B bond variations. Strong trans donors yield inert complexes, while CO ligands enable boryl transfer reactions, mimicking noble metal chemistry.

Keywords:
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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry

Background:

  • Cobalt boryl complexes are rarely reported.
  • Understanding M-B bond nature is crucial for reactivity.

Purpose of the Study:

  • To systematically synthesize cobalt boryl complexes.
  • To investigate the influence of trans ligands on M-B bond stability and reactivity.
  • To explore boryl transfer reactions using base-metal complexes.

Main Methods:

  • Synthesis of cobalt boryl complexes with varying trans ligands (strong σ-donor vs. CO).
  • Characterization of M-B bond properties under different electronic conditions.
  • Investigation of reactivity, including acid stability and CO migratory insertion.

Main Results:

  • Remarkable and controllable variation in cobalt-boron (Co-B) bond nature achieved.
  • Complexes with strong trans σ-donors exhibit high inertness, retaining the Co-B bond in strong acid.
  • The π-acceptor CO ligand in the trans position labilizes the boryl ligand via migratory insertion, enabling coordinative unsaturation.

Conclusions:

  • Cobalt boryl complexes offer tunable reactivity through ligand design.
  • CO migratory insertion in cobalt boryl complexes provides access to reactive intermediates.
  • This base-metal chemistry facilitates alkene functionalization via boryl transfer, similar to noble metal catalysis.