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Related Experiment Videos

Dinitrogen activation in sterically-hindered three-coordinate transition metal complexes.

Gemma Christian1, Jenni Driver, Robert Stranger

  • 1Department of Chemistry, The Australian National University, Canberra ACT 0200, Australia.

Faraday Discussions
|October 7, 2003
PubMed
Summary

Sterically-hindered transition metal complexes show promise for activating dinitrogen (N2). Strong pi donor ligands and d3 metal ions, particularly third-row metals like tungsten, optimize N2 activation and cleavage.

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Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Sterically-hindered, three-coordinate transition metal complexes (ML3) are promising for small molecule activation.
  • Activation and scission of dinitrogen (N2), nitric oxide (NO), and nitrous oxide (N2O) are synthetically important.

Purpose of the Study:

  • To identify optimal metal/ligand combinations for dinitrogen (N2) activation and cleavage using density functional methods.
  • To investigate the electronic and steric factors influencing N2 activation in dinuclear metal systems.

Main Methods:

  • Density functional theory (DFT) calculations were employed.
  • Analysis of N-N bond lengths in intermediate dimer complexes (L3Mo(μ-N2)MoL3).
  • Fragment bonding analysis to understand ligand orientation effects.

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Main Results:

  • Strong pi donor ligands (e.g., NH2, OH) significantly enhance N2 activation compared to weak pi donors.
  • Ligand orientation is crucial; a 90-degree rotation of amide ligands in Mo-NH2 and W-NH2 systems increases activation.
  • d3 metal ions, especially third-row Ta(II), W(III), and Re(IV), show the highest N2 activation, decreasing with increasing nuclear charge.

Conclusions:

  • The electronic configuration of the metal (d3) and the nature of ancillary ligands are key to efficient N2 activation.
  • Ligand orientation and metal's ability to back-donate electrons into N2 π* orbitals dictate the extent of activation.
  • Third-row d3 transition metals offer the most potent systems for dinitrogen cleavage.