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Solvent-hindered intramolecular vibrational redistribution.

John T King1, Jessica M Anna, Kevin J Kubarych

  • 1Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.

Physical Chemistry Chemical Physics : PCCP
|March 2, 2011
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Hydrogen bonds in linear alcohols slow vibrational energy transfer in dimanganese decacarbonyl. This study reveals how solvent interactions influence molecular dynamics and vibrational relaxation rates.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Manganese carbonyl complexes exhibit complex vibrational dynamics.
  • Solvent interactions significantly influence molecular properties and reaction pathways.

Purpose of the Study:

  • To investigate the effect of hydrogen bonding on vibrational energy redistribution in dimanganese decacarbonyl (Mn2(CO)10).
  • To elucidate the relationship between solvent structure and intramolecular vibrational energy transfer.

Main Methods:

  • Ultrafast two-dimensional infrared (2D IR) spectroscopy was employed to probe vibrational dynamics.
  • Molecular dynamics (MD) simulations were performed to model solute-solvent interactions and energy transfer pathways.

Main Results:

  • The rate of intramolecular vibrational redistribution (IVR) among terminal carbonyl stretches is directly correlated with the average number of hydrogen bonds formed between Mn2(CO)10 and linear alcohol solvents.
  • Hydrogen bond formation was observed to impede IVR between specific vibrational eigenstates.
  • The overall T(1) relaxation rate of the system remained unaffected by the varying hydrogen bond strengths.

Conclusions:

  • Hydrogen bonding acts as a significant factor in modulating vibrational energy flow within Mn2(CO)10.
  • The study highlights the importance of specific solute-solvent interactions in controlling ultrafast energy transfer processes.