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Anharmonicity of weakly bound M(+)-H2 complexes.

Nuwan De Silva1, Bosiljka Njegic, Mark S Gordon

  • 1Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.

The Journal of Physical Chemistry. A
|March 31, 2011
PubMed
Summary
This summary is machine-generated.

This study investigates the anharmonicity of metal cation dihydrogen complexes using vibrational self-consistent field (VSCF) methods. Calculations reveal red-shifted H-H stretching frequencies, consistent with experimental data.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Weakly bound complexes exhibit unique vibrational properties.
  • Understanding anharmonicity is crucial for characterizing molecular interactions.
  • Metal cation dihydrogen (M(+)-H(2)) complexes serve as model systems for studying these phenomena.

Purpose of the Study:

  • To investigate the anharmonicity of M(+)-H(2) complexes.
  • To calculate H-H stretching frequency shifts for various metal cations.
  • To analyze trends in frequency shifts and compare with existing data.

Main Methods:

  • Vibrational self-consistent field (VSCF) approach for anharmonicity.
  • Coupled-cluster method (CCSD(T)) with cc-pVTZ basis set for frequency calculations.
  • Symmetry adapted perturbation theory (SAPT) for analyzing trends.

Main Results:

  • Calculated red shifts in H-H stretching frequencies for Li(+)-H(2), B(+)-H(2), Na(+)-H(2), and Al(+)-H(2) complexes.
  • Specific red shift values: 121 cm(-1) for Li(+)-H(2), 202 cm(-1) for B(+)-H(2), 74 cm(-1) for Na(+)-H(2), and 62 cm(-1) for Al(+)-H(2).
  • Observed trends in red shifts show good agreement with experimental and prior computational results.

Conclusions:

  • The VSCF and CCSD(T) methods accurately predict the anharmonicity and vibrational frequency shifts in M(+)-H(2) complexes.
  • The calculated red shifts provide valuable insights into the nature of the interactions within these weakly bound systems.
  • The findings support the use of these computational methods for studying similar molecular complexes.