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Polyhapto-aromatic interactions in lead(II) coordination.

Jack M Harrowfield1, Saeed Maghaminia, Ali A Soudi

  • 1Chemistry, School of Biomedical and Chemical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. cages@chem.uwa.edu.au

Inorganic Chemistry
|March 17, 2004
PubMed
Summary

The lead(II) complex with dibenzoylmethanide (DBM) forms polymeric chains with high lead atom hapticity. This unique structure suggests lead(II) can act as both a Lewis acid and base.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • The coordination chemistry of lead(II) complexes is less understood compared to other metal ions.
  • 1,3-diphenylpropane-1,3-dionate (dibenzoylmethanide, DBM(-)) is a versatile bidentate ligand.
  • Understanding metal-ligand interactions is crucial for designing novel materials.

Purpose of the Study:

  • To elucidate the crystalline structure and coordination behavior of the Pb(II)-DBM complex.
  • To investigate the bonding interactions and hapticity of lead atoms within the complex.
  • To compare the coordination properties of Pb(II) with analogous Sn(II) compounds.

Main Methods:

  • Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.

Related Experiment Videos

  • Analysis of Pb-phenyl interactions, including hexahapto and dihapto-aromatic bonding.
  • Comparative study with the structure of the analogous tin(II) complex.

    • Main Results:

    • The Pb(II)-DBM complex crystallizes into polymeric chains of dimeric Pb(2)(DBM)(4) units.
    • Lead atoms exhibit hexahapto interactions with phenyl groups of adjacent units and dihapto-aromatic interactions within the unit.
    • The lead atoms attain an unusually high total hapticity of thirteen.
    • Comparison with Sn(II) suggests Pb(II)'s capacity for Lewis acid and base behavior contributes to high coordination.

    Conclusions:

    • The Pb(II)-DBM complex displays a unique polymeric structure with high lead atom hapticity.
    • The observed coordination behavior highlights the dual Lewis acid/base nature of Pb(II).
    • This study provides insights into the coordination chemistry of lead and potential applications in materials science.