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Bioinorganic chemistry modeled with the TPSSh density functional.

Kasper P Jensen1

  • 1Department of Chemistry, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark. kpj@kemi.dtu.dk

Inorganic Chemistry
|October 16, 2008
PubMed
Summary

The TPSSh density functional accurately predicts structures and bond energies for transition metals. It significantly reduces errors in calculations for bioinorganic chemistry reactions compared to other functionals.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Bioinorganic Chemistry

Background:

  • Accurate theoretical methods are crucial for understanding transition metal chemistry.
  • Existing density functionals show systematic errors in predicting bond energies and reaction energetics.

Purpose of the Study:

  • To benchmark the TPSSh density functional against experimental data for transition-metal-containing diatomics.
  • To evaluate the performance of TPSSh for key bioinorganic reactions.

Main Methods:

  • Benchmarking TPSSh against experimental structures and bond energies for 80 transition-metal diatomics.
  • Investigating typical bioinorganic reactions using TPSSh, including spin inversion and bond breaking/formation.
  • Comparing TPSSh results with other functionals like B3LYP and BP86.

Main Results:

  • TPSSh provides structural accuracy comparable to B3LYP and BP86.
  • TPSSh reduces root-mean-square errors in bond energies from 46-57 to 34 kJ/mol.
  • Reaction energies calculated with TPSSh show a linear correlation with the percentage of exact exchange, outperforming other functionals in accuracy.

Conclusions:

  • TPSSh is a highly promising density functional for bioinorganic chemistry due to its improved accuracy in energetics.
  • The inclusion of 10% exact exchange in TPSSh is key to its success.
  • TPSSh offers a balanced approach, providing energies between nonhybrid and hybrid functionals.