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Intrinsic rotation and molecular structure.

Prasad L Polavarapu1, Ana Petrovic, Feng Wang

  • 1Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA.

Chirality
|July 29, 2003
PubMed
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The specific rotation of (R)-(-)-epichlorohydrin changes sign depending on the solvent, explained by two conformations with opposite rotation. This study combines experimental measurements with computational predictions for molecular structure determination.

Area of Science:

  • * Chirality and Stereochemistry
  • * Computational Chemistry
  • * Organic Chemistry

Background:

  • * The specific rotation of chiral molecules can be influenced by solvent interactions.
  • * Understanding conformational preferences is key to predicting molecular properties.
  • * (R)-(-)-epichlorohydrin is a chiral epoxide with potential applications.

Purpose of the Study:

  • * To investigate the solvent-dependent specific rotation of (R)-(-)-epichlorohydrin.
  • * To elucidate the conformational behavior of epichlorohydrin in different solvents.
  • * To validate density functional theory (DFT) in predicting molecular rotation.

Main Methods:

  • * Measurement of intrinsic rotation of (R)-(-)-epichlorohydrin in methanol, dichloromethane, chloroform, and carbon tetrachloride.

Related Experiment Videos

  • * Density functional calculations of specific rotation using large basis sets.
  • * Analysis of conformational populations (g-I and g-II) and their contribution to rotation.

    • Main Results:

    • * Solvent-dependent sign changes in specific rotation were observed.
    • * Methanol and dichloromethane showed opposite rotation compared to carbon tetrachloride.
    • * Chloroform resulted in near-zero net rotation due to equal populations of conformations.
    • * DFT calculations supported the experimental findings, identifying two conformations with opposite specific rotation signs.

    Conclusions:

    • * The observed solvent effects on epichlorohydrin's rotation are due to the relative populations of two conformations with opposing specific rotations.
    • * DFT calculations accurately predict specific rotation and conformational preferences.
    • * Combining experimental rotation measurements with DFT predictions offers a practical approach for molecular structure determination.