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Nitrogen activation via three-coordinate molybdenum complexes: comparison of density functional theory performance

David C Graham1, Gregory J O Beran, Martin Head-Gordon

  • 1School of Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia.

The Journal of Physical Chemistry. A
|July 13, 2006
PubMed
Summary

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Accurately modeling dinitrogen activation by molybdenum amide complexes is challenging. While density functional theory offers insights, high-level wave function methods reveal subtle differences in reaction energetics and electronic structure.

Area of Science:

  • Computational Chemistry
  • Inorganic Chemistry
  • Quantum Chemistry

Background:

  • Dinitrogen activation by three-coordinate molybdenum amide complexes is mechanistically complex.
  • Accurate theoretical models require treating multiple open-shell spin states consistently.
  • Density functional theory (DFT) is often used but shows sensitivity to functional choice.

Purpose of the Study:

  • To assess the accuracy of DFT functionals for modeling dinitrogen activation.
  • To compare DFT results with high-level wave function based methods.
  • To understand the electronic structure and energetics of the reaction pathway.

Main Methods:

  • Utilized various Density Functional Theory (DFT) functionals.
  • Employed high-level wave function based methods, including coupled-cluster approaches (e.g., CCSD(T), OD(T), spin-flip CCSD).

Related Experiment Videos

  • Analyzed potential energy surfaces and reaction energetics.

    • Main Results:

    • DFT functionals provide qualitatively similar mechanistic details for dinitrogen activation.
    • Energetics of the dinitrogen activation reaction vary significantly across different DFT functionals.
    • High-level wave function methods yield a consistent, albeit slightly different, representation compared to DFT.

    Conclusions:

    • Current DFT functionals capture the general mechanism of molybdenum-mediated dinitrogen activation.
    • Precise energetics require advanced electron correlation methods beyond standard DFT.
    • Further refinement of theoretical models is needed for quantitative accuracy in open-shell reaction studies.