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Related Concept Videos

Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Chirality in Nature02:30

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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Sensing Chirality with Rotational Spectroscopy.

Sérgio R Domingos1,2,3, Cristóbal Pérez1,2,3, Melanie Schnell1,2,3

  • 1Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany.

Annual Review of Physical Chemistry
|March 1, 2018
PubMed
Summary

This study introduces microwave three-wave mixing, a novel gas-phase technique for analyzing molecular chirality. It enables unambiguous determination of molecular structure, handedness, and enantiomeric excess, advancing chiral molecule research.

Keywords:
chiralitycooled buffer gasdiastereomersenantiomershigh-resolution spectroscopymicrowave spectroscopypopulation transferrotational coherencestructure determinationsupersonic expansion

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Molecular Chirality

Background:

  • Chiroptical spectroscopy traditionally differentiates enantiomers in condensed phases using circularly polarized light.
  • A new paradigm is needed for studying chiral molecules in the gas phase.

Purpose of the Study:

  • To review a novel broadband rotational spectroscopy technique for gas-phase chiral molecule analysis.
  • To highlight microwave three-wave mixing as a robust method for studying molecular chirality.

Main Methods:

  • Utilizing microwave three-wave mixing, a coherent, nonlinear, resonant process.
  • Generating a detectable coherent molecular rotational signal.
  • Employing tailored microwave fields for analysis.

Main Results:

  • Unambiguous determination of gas-phase sample structure, conformation distribution, handedness, and enantiomeric excess.
  • Demonstration of enantiomer differentiation using the technique.
  • Extension to enantiomer-selective population transfer for potential spatial separation.

Conclusions:

  • Microwave three-wave mixing is a rapidly advancing, robust technique for gas-phase molecular chirality studies.
  • The method offers precise structural and enantiomeric information.
  • Recent advancements pave the way for on-the-fly enantiomer separation.