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Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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(12)C2H2-Ar van der Waals complex.

C Lauzin1, K Didriche, P Macko

  • 1Laboratoire de Chimie quantique et Photophysique, CP160/09, Faculte des Sciences, Universite libre de Bruxelles, Ave. Roosevelt, 50, B-1050, Brussels, Belgium.

The Journal of Physical Chemistry. A
|March 14, 2009
PubMed
Summary
This summary is machine-generated.

This study explores the acetylene-argon van der Waals complex using advanced computational and experimental methods. Results reveal minimal structural changes and slight vibrational frequency shifts in acetylene upon complexation, with implications for understanding intermolecular interactions.

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Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Computational Chemistry

Background:

  • Van der Waals complexes are crucial for understanding intermolecular forces.
  • Acetylene-argon (C2H2-Ar) serves as a model system for studying weak interactions.
  • Previous studies provide a foundation for further theoretical and experimental investigations.

Purpose of the Study:

  • To present new theoretical and experimental findings on the acetylene-Ar van der Waals complex.
  • To review existing literature on the C2H2-Ar system.
  • To investigate the influence of complexation on acetylene's structure and vibrational properties.

Main Methods:

  • Ab initio calculations at the MP2 level with large basis sets and diffuse functions.
  • Accounting for basis set superposition error (BSSE) in calculations.
  • Experimental production of C2H2-Ar in a supersonic expansion at 9 K rotational temperature.
  • High-resolution spectroscopy using continuous-wave cavity ring-down spectroscopy (CW-CRDS).

Main Results:

  • Complexation minimally alters acetylene's structure and slightly lowers vibrational frequencies.
  • Calculated properties (structure, spectrum, dissociation energy) show low sensitivity to imposed acetylene structure.
  • Experimental recording and assignment of sub-bands (K(a) = 0, 1, 2) of the nu(1) + nu(3) band.
  • Determination of upper-state rotational constants and a mean lifetime of approximately 7.5 ns from line profile analysis.
  • Observation of K-doubling anomalies and local perturbations in the spectrum.

Conclusions:

  • Acetylene-Ar complexation has a limited impact on the internal structure and vibrational modes of acetylene.
  • Experimental spectroscopic data provide insights into the complex's dynamics and intermolecular interactions.
  • Observed spectral perturbations and K-doubling suggest complex interactions within the acetylene-Ar system.