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S0 ring-puckering potential energy function for coumaran.

Juan Yang1, Katsuhiko Okuyama, Kevin Morris

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA.

The Journal of Physical Chemistry. A
|July 13, 2006
PubMed
Summary
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Far-infrared spectroscopy reassigned coumaran

Area of Science:

  • Molecular Spectroscopy
  • Quantum Chemistry
  • Physical Chemistry

Background:

  • Coumaran's ring-puckering vibration is crucial for understanding its molecular dynamics.
  • Previous studies have provided limited data on coumaran's potential energy surface.

Purpose of the Study:

  • To reassign the far-infrared spectrum of coumaran.
  • To determine the one-dimensional potential energy function for coumaran's ring-puckering vibration.
  • To investigate the barrier to planarity and dihedral angle.

Main Methods:

  • Analysis of far-infrared spectrum using reported inversion splitting value.
  • Determination of the one-dimensional potential energy function.
  • Comparison with millimeter wave spectroscopy and ab initio calculations (MP2/cc-pvtz).

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Main Results:

  • The barrier to planarity was determined to be 155 ± 4 cm⁻¹ with a dihedral angle of 25 degrees.
  • These results show good agreement with millimeter wave data (152 cm⁻¹, 23 degrees).
  • Ab initio calculations yielded higher values (238 cm⁻¹, 26.5 degrees).
  • The calculated barrier decreased to 204 cm⁻¹ when the benzene ring was assumed rigid.
  • Barriers for ring-flapping and ring-twisting excited states were 149 cm⁻¹ and 156 cm⁻¹, respectively.

Conclusions:

  • The reassignment of the far-infrared spectrum provides a refined potential energy function for coumaran.
  • The study validates experimental findings through comparison with different spectroscopic techniques and computational methods.
  • Understanding coumaran's vibrational dynamics is essential for its chemical characterization.