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Related Concept Videos

Chirality02:25

Chirality

24.2K
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

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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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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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...
3.8K
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

17.0K
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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A Micropatterning Assay for Measuring Cell Chirality
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A 2D chiral microcavity based on apparent circular dichroism.

Tzu-Ling Chen1,2, Andrew Salij3, Katherine A Parrish1

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI, 53706, USA.

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Researchers achieved asymmetric light transmission in microcavities using 2D chiral organic films, avoiding complex nanofabrication. This breakthrough enables new chiral light-matter interactions for advanced optics and spintronics.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Chiral Photonics

Background:

  • Asymmetric light transmission in microcavities is crucial for chiral light-matter interactions.
  • Conventional methods often require complex Faraday rotators or nanofabrication.
  • Low mode volumes are desirable for enhanced light-matter coupling.

Purpose of the Study:

  • To demonstrate a simple, nanofabrication-free method for inducing asymmetric transmission in planar Fabry-Pérot microcavities.
  • To leverage apparent circular dichroism (ACD) in 2D chiral organic thin films for symmetry breaking.
  • To preserve low mode volumes for efficient chiral light-matter phenomena.

Main Methods:

  • Embedding organic thin films with apparent circular dichroism (ACD) into Fabry-Pérot microcavities.
  • Utilizing the opposite ACD interactions for counter-propagating light.
  • Characterizing chiroptical responses using circular dichroism spectroscopy and Mueller matrix ellipsometry.
  • Employing theoretical scattering matrix methods for simulation.

Main Results:

  • Achieved significant asymmetric transmission of cavity modes, exceeding that of the isolated thin film by over an order of magnitude.
  • Demonstrated a nanofabrication-free approach to break symmetry in microcavities.
  • Successfully preserved low mode volumes within the microcavity structure.

Conclusions:

  • The proposed method offers a simple and effective route to engineer asymmetric light transmission in microcavities.
  • Apparent circular dichroism in 2D chiral organic films is a viable mechanism for creating chiral optical devices.
  • This work paves the way for advancements in spintronics, polaritonics, and chiral lasing applications.