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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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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Properties of Enantiomers and Optical Activity02:24

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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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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Prochirality02:05

Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Odd Dynamics of Passive Objects in a Chiral Active Bath.

Cory Hargus1, Federico Ghimenti1,2, Julien Tailleur1,3

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Passive objects in chiral active baths exhibit unique spinning and transport behaviors. Their dynamics reveal increasing irreversibility and distinct temperatures as object symmetry decreases, offering insights into non-equilibrium systems.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Chiral active baths create unique environments for passive objects.
  • Understanding object dynamics in non-equilibrium systems is crucial.

Purpose of the Study:

  • To present the most general Langevin dynamics for a rigid body in a chiral active bath.
  • To investigate the breakdown of Einstein relations and increasing irreversibility with decreasing object symmetry.

Main Methods:

  • Developing general Langevin dynamics for rigid bodies in chiral active baths.
  • Adiabatic limit approximation for large object masses.
  • Numerical simulations and analytical derivations.

Main Results:

  • Odd diffusion and mobility are linked by an Einstein relation for symmetric objects in the adiabatic limit.
  • This relation breaks down outside the adiabatic limit.
  • Decreasing object symmetry leads to irreversible dynamics, distinct translational/rotational temperatures (rods), and full irreversibility (wedges).

Conclusions:

  • Object symmetry dictates the degree of irreversibility and departure from equilibrium.
  • Far-field bath properties reflect the object's non-equilibrium dynamics.
  • The study provides a comprehensive framework for understanding passive object behavior in chiral active baths.