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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Chirality in Nature02:30

Chirality in Nature

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. The...
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Stereoisomerism02:52

Stereoisomerism

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...
Prochirality02:05

Prochirality

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...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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Updated: Jun 18, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

In-Situ Ligand-Induced Chirality Transfer in Emissive CdSe Nanoplatelets.

William Girten1,2, Farwa Awan2, Nikita S Dutta1

  • 1National Laboratory of the Rockies, Golden, Colorado 80401, United States.

The Journal of Physical Chemistry Letters
|June 17, 2026
PubMed
Summary

Researchers developed a single-step synthesis for chiral cadmium selenide (CdSe) nanoplatelets (NPLs). This method overcomes solvent issues, yielding highly emissive chiral CdSe NPLs with enhanced chiroptical properties.

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Published on: August 10, 2017

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Last Updated: Jun 18, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
09:12

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Published on: August 10, 2017

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Semiconductor nanocrystals (NCs) can exhibit chiroptical properties when functionalized with chiral ligands.
  • Current synthesis methods face challenges due to solvent incompatibility and ligand dissolution, limiting NC quality and chiroptical control.

Purpose of the Study:

  • To develop a facile, single-step synthesis for chiral cadmium selenide (CdSe) nanoplatelets (NPLs).
  • To achieve in situ ligand binding and chirality transfer without post-synthetic ligand exchange.
  • To produce highly emissive chiral CdSe NPLs with tunable chiroptical properties.

Main Methods:

  • Single-step synthesis of CdSe NPLs incorporating chiral aminodecanoic acid ligands directly during growth.
  • Elimination of post-synthetic ligand exchange in aqueous solvents.
  • Characterization of photoluminescence quantum efficiency (PLQE) and circular dichroism (CD) dissymmetry factors (gCD).

Main Results:

  • Successful synthesis of chiral CdSe NPLs via a one-step process.
  • Achieved high photoluminescence quantum efficiencies (PLQE) of 50%.
  • Obtained circular dichroism dissymmetry factors (gCD) on the order of 10-4.

Conclusions:

  • The developed single-step synthesis effectively integrates chiral ligands, enabling direct chirality transfer to CdSe NPLs.
  • This approach overcomes previous limitations, yielding high-quality, emissive chiral nanomaterials.
  • The method offers a promising route for manipulating chiroptical properties in semiconductor nanocrystals.