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Related Concept Videos

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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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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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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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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Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Updated: Dec 8, 2025

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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Chiral 3D CdSe Nanotetrapods.

Xiao Shao1,2, Yue Wu1,2, Shuang Jiang1

  • 1Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China.

Inorganic Chemistry
|September 18, 2020
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Summary

Researchers synthesized uniform 3D cadmium selenide nanotetrapods and introduced chiral ligands to create enantiopure nanomaterials. These chiral 3D nanomaterials exhibit unique circular dichroism properties influenced by their size and structure.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Physics

Background:

  • Three-dimensional (3D) nanomaterials offer unique properties for diverse applications.
  • Ligand-induced chirality in 3D semiconductor nanocrystals remains underexplored.

Purpose of the Study:

  • To synthesize uniform 3D cadmium selenide (CdSe) nanotetrapods (Tps).
  • To introduce chirality into these 3D nanomaterials using enantiopure ligands.
  • To investigate the structure-dependent circular dichroism (CD) properties.

Main Methods:

  • Hot-injection synthesis of CdSe nanotetrapods with controlled morphology.
  • Surface ligand exchange with enantiopure cysteine to induce chirality.
  • Circular dichroism spectroscopy to analyze chiral properties.

Main Results:

  • Uniform 3D CdSe Tps with distinct core and arm crystal structures (intracrystal heterojunction) were synthesized.
  • Chiral l- and d-cysteine-capped CdSe Tps were successfully prepared.
  • CD line shapes correlated with excitonic transitions in core and arms; CD activity depended on aspect ratio.

Conclusions:

  • A mechanism for induced CD in chiral 3D CdSe Tps involving excitonic states and charge transfer is proposed.
  • Chiral 3D nanomaterials with anisotropic morphologies show promise for novel applications.