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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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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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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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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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...
11.6K
Stereoisomerism02:52

Stereoisomerism

11.9K
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-Induced Spin Selectivity in Composite Materials: A Device Perspective.

Seyedamin Firouzeh1, Md Anik Hossain1, Juan Manuel Cuerva2

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Chirality-induced spin selectivity (CISS) offers a new route for spintronic devices, bypassing ferromagnets. Chiral composite materials show promise for advanced spin injection and detection at the nanoscale.

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Area of Science:

  • Nanospintronics
  • Quantum Technologies
  • Materials Science

Background:

  • Magnetism, originating from electron spin, is crucial for data storage and sensing.
  • Current nanospintronics relies on ferromagnets, which have limitations like stray fields and thermal instability.
  • Emerging phenomena like chirality-induced spin selectivity (CISS) offer new possibilities.

Purpose of the Study:

  • To review spintronic device applications of CISS.
  • To explore chiral composite materials as a promising platform for CISS devices.
  • To highlight the potential of CISS for future spintronics beyond ferromagnets.

Main Methods:

  • Review of spintronic device results utilizing CISS.
  • Discussion of chirality transfer mechanisms in chiral composite materials.
  • Analysis of CISS device studies on chiral organic-carbon allotrope composites.

Main Results:

  • CISS enables spin injection and detection without ferromagnets, enabling molecular-scale control.
  • Chiral composite materials offer a versatile platform for CISS, combining desirable properties.
  • CISS signals in hybrid chiral systems can differ from purely chiral systems.

Conclusions:

  • Chiral composite materials are a promising avenue for advancing CISS-based spintronic devices.
  • Further research into diverse chiral composites is encouraged to unlock their full potential in spintronics.
  • CISS technology could revolutionize future nanoscale electronic and quantum devices.