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Chirality in Nature02:30

Chirality in Nature

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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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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.
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The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Molecules with Multiple Chiral Centers02:25

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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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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Related Experiment Video

Updated: Jan 8, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Dumbbell dimer dynamics in three-dimensional chiral fluids.

Michalis Chatzittofi1,2, Yuto Hosaka1

  • 1Max Planck Institute for Dynamics and Self-Organization, (MPI-DS), Am Fassberg 17, 37077 Göttingen, Germany.

Physical Review. E
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

Chirality in a chiral environment with odd viscosity induces rotational dynamics in dumbbell dimers. Thermal fluctuations further influence rotational diffusivity by coupling conformational changes and motion.

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Area of Science:

  • Soft Matter Physics
  • Chemical Physics
  • Materials Science

Background:

  • Classical systems with conserved parity symmetry typically do not exhibit rotational motion from reciprocal oscillations.
  • Understanding emergent dynamics in chiral environments is crucial for designing novel molecular machines and materials.

Purpose of the Study:

  • To investigate the orientational dynamics of a dumbbell dimer in a three-dimensional chiral environment with odd viscosity.
  • To determine how chirality and thermal fluctuations influence the rotational motion and diffusivity of the dimer.

Main Methods:

  • Analytical calculations were performed to model the dimer's behavior.
  • The study incorporated thermal fluctuations to explore their impact on rotational dynamics.

Main Results:

  • The presence of chirality was found to induce rotational dynamics dependent on the dimer's expansion/contraction.
  • Rotational diffusivity is significantly affected by the coupling between conformational fluctuations and rotational motion.

Conclusions:

  • This research provides insights into systems where parity symmetry is broken, particularly in odd-viscous fluids.
  • The findings can serve as a foundation for studying collective behaviors in complex systems like multicomponent molecular machines and charged polymers.