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Related Experiment Videos

A three-coordinate and quadruply bonded Mo-Mo complex.

Yi-Chou Tsai1, Yang-Miin Lin, Jen-Shiang K Yu

  • 1Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China. yictsai@mx.nthu.edu.tw

Journal of the American Chemical Society
|October 26, 2006
PubMed
Summary
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Researchers synthesized a new dimolybdenum complex with a triple bond and reduced it to form a quadruple bond. This quadruple bond is unusually long, offering insights into molybdenum-molybdenum bonding.

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Synthesis

Background:

  • Molybdenum-molybdenum bonding is a key area in inorganic chemistry.
  • Synthesis of low-valent molybdenum complexes is challenging.
  • Sterically hindered ligands can stabilize unusual metal-metal bonds.

Purpose of the Study:

  • To synthesize and characterize novel dimolybdenum complexes.
  • To investigate the formation and nature of metal-metal bonds in these complexes.
  • To explore the influence of bulky ligands on molybdenum-molybdenum bond characteristics.

Main Methods:

  • Reaction of MoCl3(THF)3 with a lithium amide reagent.
  • Characterization using NMR spectroscopy, elemental analysis, and X-ray crystallography.

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  • Reductive methods to achieve lower oxidation states.
  • Density Functional Theory (DFT) computations.

    • Main Results:

    • Synthesis of a triply bonded dimolybdenum complex, 1,2-Mo2Cl2[Me2Si(NDipp)2]2.
    • Characterization of the syn conformation and air-sensitive nature of complex 1.
    • Reduction to a quadruply bonded dimeric complex, Mo2[Me2Si(NDipp)2]2 (2).
    • Determination of a long Mo-Mo quadruple bond length of 2.1784(12) Å.
    • DFT calculations provided insights into the quadruple bond.

    Conclusions:

    • The bulky Me2Si(NDipp)2 ligand facilitates the formation of low-coordinate dimolybdenum species.
    • The synthesized quadruple bond is one of the longest reported, offering valuable data on metal-metal bonding.
    • DFT studies support the structural and bonding characteristics of the quadruple bond.