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Chirality

Chirality

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...

Chirality in Nature

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...

Chirality at Nitrogen, Phosphorus, and Sulfur

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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Related Experiment Video

Updated: Jun 26, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

Published on: March 5, 2019

Chiral gold nanoparticles.

Cyrille Gautier¹, Thomas Bürgi

¹Université de Neuchâtel, Institut de Microtechnique, Rue Emile-Argand 11, 2009 Neuchâtel, Switzerland.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|January 15, 2009

Summary

This summary is machine-generated.

Chiral gold nanoparticles exhibit unique chiroptical properties, enabling advancements in chiral technologies. This review covers their preparation, optical activity models, and applications in sensing and catalysis.

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Area of Science:

Nanomaterials Science
Physical Chemistry
Organic Chemistry

Background:

Monolayer-protected gold nanoparticles possess unique quantum size effects, surface plasmon resonance, and catalytic activity.
These hybrid organic-inorganic nanomaterials are valuable in nanotechnology, catalysis, and sensing.
The chirality of gold nanoparticles is a recent area of interest for chiral technologies.

Purpose of the Study:

To review the preparation of chiral gold nanoparticles.
To discuss their chiroptical properties and models explaining optical activity.
To explore applications in chiral technologies.

Main Methods:

Preparation of chiral gold nanoparticles.
Analysis of chiroptical properties.
Quantum chemical calculations.
Circular dichroism spectroscopy.
Vibrational circular dichroism spectroscopy.

Main Results:

Chiral gold nanoparticles exhibit distinct chiroptical properties.
Various models are discussed to explain optical activity in metal-based electronic transitions.
Vibrational circular dichroism can determine adsorbate structure and metal interactions.

Conclusions:

Chiral gold nanoparticles offer exciting possibilities for chiral technologies.
Understanding their chiroptical properties is key to unlocking their potential.
These nanomaterials show promise in advanced sensing and catalytic applications.