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Novel tungsten calix[8]arene complexes.

Vernon C Gibson1, Carl Redshaw, Mark R J Elsegood

  • 1Department of Chemistry, Imperial College, South Kensington, London, UK SW7 2AY.

Chemical Communications (Cambridge, England)
|July 12, 2002
PubMed
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Researchers synthesized novel metallocalixarenes from p-tert-Butylcalix[8]areneH8 and WCl6. One derivative features the first metal-metal triple bond supported by a calixarene ligand, confirmed by X-ray diffraction.

Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Coordination Chemistry

Background:

  • Calixarenes are macrocyclic compounds with versatile coordination properties.
  • Tungsten halides are key precursors in organometallic synthesis.
  • Large macrocyclic ligands can stabilize unusual metal-metal bonding.

Purpose of the Study:

  • To synthesize new metallocalixarene complexes.
  • To investigate the formation of metal-metal bonds within these complexes.
  • To characterize the structure and conformation of the resulting compounds.

Main Methods:

  • Reaction of p-tert-Butylcalix[8]areneH8 with tungsten hexachloride (WCl6).
  • Reduction of a metallocalixarene intermediate.
  • Single crystal X-ray diffraction for structural determination.

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Main Results:

  • Synthesis of several novel metallocalix[8]arene complexes.
  • Formation of a tungsten-tungsten triple bond, stabilized by the calixarene ligand.
  • Detailed structural analysis revealing metallation degrees and conformations.

Conclusions:

  • The study demonstrates the utility of calixarenes in stabilizing reactive metal centers.
  • The discovery of a metal-metal triple bond in a calixarene complex opens new avenues in inorganic synthesis.
  • X-ray diffraction is crucial for understanding the structural intricacies of these large metallo-supramolecular systems.