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Related Concept Videos

Chirality02:25

Chirality

23.4K
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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Prochirality02:05

Prochirality

3.8K
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
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

5.7K
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...
5.7K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.3K
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...
11.3K
Stereoisomerism02:52

Stereoisomerism

11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Related Experiment Video

Updated: Jun 9, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Responsive Chirality: Tailoring Supramolecular Assemblies with External Stimuli as Future Platforms for

Meenal Kataria1, Shu Seki1

  • 1Department of Molecular Engineering, Kyoto University, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 27, 2024
PubMed
Summary

Supramolecular chirality, crucial in biology and materials science, can be modulated by external stimuli. This review explores how stimuli like solvents and light alter supramolecular chirality for advanced electronic applications.

Keywords:
Chirality modulationExternal stimuliSelf-assemblySupramolecular chiralityWallach rule

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Area of Science:

  • Supramolecular Chemistry
  • Chirality Studies
  • Materials Science

Background:

  • Supramolecular chirality is vital in biological processes and synthetic systems.
  • Designing chiral ensembles mimicking biomolecules (DNA, RNA, amino acids) is key to understanding biological complexity.
  • Chiral systems with broken spatial inversion symmetry are essential for electronics, spintronics, chemistry, and physics.

Purpose of the Study:

  • To understand how external stimuli modulate spatial arrangements and packing in supramolecular systems.
  • To explore the tailoring of handedness in supramolecular chiral superstructures.
  • To review the role of stimuli in altering supramolecular chirality for future applications.

Main Methods:

  • This review focuses on analyzing existing literature and research findings.
  • It examines the impact of various external stimuli on supramolecular chiral systems.
  • The study highlights the principles of self-assembly and chiral recognition.

Main Results:

  • External stimuli such as solvents, chemical additives, and photo exposure can significantly alter supramolecular chirality.
  • Modulation of spatial arrangements and packing modes leads to predictable changes in handedness.
  • These stimuli-responsive chiral systems offer potential for dynamic control over material properties.

Conclusions:

  • External stimuli offer a powerful method for controlling supramolecular chirality.
  • Tailoring supramolecular chirality is crucial for developing advanced optoelectronic and spintronic devices.
  • Future research should focus on harnessing these stimuli-responsive systems as "active switches".