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Related Concept Videos

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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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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Stereoisomerism02:52

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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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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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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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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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A Multiple Chirality Switching Device for Spatial Light Modulators.

Guojian Yang1,2, Yang Yu1,2, Baige Yang1,2

  • 1State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, P. R. China.

Angewandte Chemie (International Ed. in English)
|September 5, 2020
PubMed
Summary
This summary is machine-generated.

A novel electric-field-driven device utilizes a chiroptical polymer and p-benzoquinone to achieve reversible triple chirality switching. This technology enables color and fluorescence modulation, with potential applications in spatial light modulators.

Keywords:
chirality switching deviceelectrobase/acidelectrofluorochromismproton-coupled electron transferspatial light modulators

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optoelectronics

Background:

  • Chiroptical polymers offer tunable optical properties.
  • Electric-field-driven switching is desirable for advanced devices.
  • Proton-coupled electron transfer (PCET) is a key mechanism in redox-responsive systems.

Purpose of the Study:

  • To design and fabricate a novel electric-field-driven multiple chirality switching device.
  • To explore the reversible regulation of triple chirality states using voltage programs.
  • To investigate the potential application of the device as a spatial light modulator.

Main Methods:

  • Synthesis of a new base-responsive chiroptical polymer (R-FLMA).
  • Fabrication of a device combining R-FLMA and p-benzoquinone (p-BQ).
  • Utilizing the proton-coupled electron transfer (PCET) mechanism for switching.
  • Characterization of chirality states, color, and fluorescence changes under voltage control.

Main Results:

  • Achieved clear, stable, and reversible triple chirality states (silence, positive, negative) in the visible band.
  • Demonstrated over 1000 cycles of reversible switching by adjusting voltage programs.
  • Observed apparent changes in color and fluorescence accompanying the chiral switching.
  • Successfully demonstrated the device's potential as a spatial light modulator.

Conclusions:

  • A simple and effective strategy for electric-field-driven multiple chirality switching has been developed.
  • The R-FLMA/p-BQ system exhibits robust and reversible switching behavior via PCET.
  • The device shows promise for applications in advanced optoelectronic devices, including spatial light modulators.