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Related Experiment Video

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Wave Function and Density Functional Theory Studies of Dihydrogen Complexes.

E Fabiano1,2, L A Constantin2, F Della Sala1,2

  • 1National Nanotechnology Laboratory (NNL), Istituto Nanoscienze-CNR , Via per Arnesano 16, 73100 Lecce, Italy.

Journal of Chemical Theory and Computation
|November 21, 2015
PubMed
Summary

This study benchmarks computational methods for dihydrogen bonds. Second-order correlation methods perform well, but triple contributions are needed for high accuracy. Density functional methods struggle with simultaneous accuracy for bond lengths and energies.

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Area of Science:

  • Computational chemistry
  • Quantum chemistry
  • Molecular interactions

Background:

  • Dihydrogen bonds are crucial non-covalent interactions.
  • Accurate computational modeling is essential for understanding these bonds.

Purpose of the Study:

  • To benchmark various computational methods for dihydrogen bond complexes.
  • To establish reference bond distances and interaction energies.

Main Methods:

  • Performed a benchmark study on dihydrogen bond complexes.
  • Assessed performance of wave function correlated and density functional theory (DFT) methods.

Main Results:

  • Second-order correlation methods provide good descriptions.
  • Inclusion of triple contributions is vital for high accuracy.
  • No tested DFT methods achieved simultaneous accuracy in bond lengths and interaction energies.
  • Nonlocal exchange contributions improved DFT results.

Conclusions:

  • Wave function methods, particularly with triple contributions, are recommended for accurate dihydrogen bond studies.
  • Current DFT methods require further development for precise dihydrogen bond characterization.