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Related Concept Videos

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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Chirality02:25

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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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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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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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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Induced CPL-Active Materials Based on Chiral Supramolecular Co-Assemblies.

Yuxia Zhang1,2, Wenting Yu1, Hang Li1

  • 1Nanjing University, State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing, 210023, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 23, 2023
PubMed
Summary

Chiral supramolecular co-assemblies enhance circularly polarized luminescence (CPL) by creating helical structures. This strategy significantly boosts the dissymmetry factor (g_em) for advanced chiral photonic and optoelectronic applications.

Keywords:
CPL amplification effectchiral supramolecular assemblychirality inductionchirality transfercircularly polarized luminescence

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Area of Science:

  • Chiral supramolecular chemistry
  • Luminescence
  • Materials Science

Background:

  • Circularly polarized luminescence (CPL) is crucial for chiral photonics and optoelectronics.
  • The dissymmetry factor (g_em) is key for evaluating CPL materials.
  • Increasing g_em is vital for practical CPL applications.

Purpose of the Study:

  • To review recent advances in CPL-active materials using chiral supramolecular co-assemblies.
  • To highlight strategies for enhancing CPL properties through supramolecular assembly.
  • To discuss applications in circularly polarized organic light-emitting diodes (CP-OLEDs).

Main Methods:

  • Utilizing chiral building blocks to form ordered helical supramolecular structures.
  • Investigating chirality transfer and induction mechanisms in co-assemblies.
  • Analyzing the impact of supramolecular organization on CPL properties.

Main Results:

  • Chiral supramolecular co-assemblies effectively improve the g_em value of CPL.
  • Helical superstructures amplify CPL signals through chirality induction.
  • Achiral dyes can exhibit enhanced CPL upon co-assembly with chiral units.

Conclusions:

  • Chiral supramolecular co-assembly is a powerful strategy for developing high-performance CPL materials.
  • These materials show significant promise for CP-OLEDs and other chiral photonic devices.
  • Further research is needed to address current challenges in the field.