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Chiral Imprinting in the Gas Phase
David W Pratt1, Brooks H Pate2
1University of Vermont, Department of Chemistry, Discovery Building, 82 University Place, Burlington, 05405, USA.
Angewandte Chemie (International Ed. in English)
|November 9, 2017
Summary
Scientists can now control molecular handedness. Using precise microwave pulses, they successfully altered the proportions of specific enantiomers in a large gas-phase molecule, a breakthrough in chiral chemistry.
Area of Science:
- Chirality and molecular symmetry
- Quantum control of molecular populations
- Gas-phase spectroscopy
Background:
- Enantiomers are non-superimposable mirror-image molecules with identical physical properties.
- Controlling enantiomeric populations is crucial for pharmaceuticals and materials science.
- Previous methods for enantiomeric separation or enrichment were often complex or inefficient.
Purpose of the Study:
- To demonstrate the selective manipulation of enantiomeric populations in large gas-phase molecules.
- To explore the use of resonant microwave fields for controlling molecular chirality.
- To establish a novel method for enantiomeric enhancement.
Main Methods:
- Application of phase- and polarization-controlled microwave pulse sequences.
- Targeting specific enantiomers of a chiral terpene in the gas phase.
- Monitoring changes in relative enantiomeric populations.
Main Results:
- Successful enhancement of one enantiomer's population over the other.
- Demonstration of precise control over molecular enantiomeric ratios.
- Validation of microwave-driven population transfer for chiral molecules.
Conclusions:
- Resonant microwave fields offer a viable pathway for controlling enantiomeric composition.
- This technique provides a new tool for enantioselective synthesis and separation.
- The findings open avenues for manipulating molecular chirality with high precision.
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