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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.

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 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...

Properties of Enantiomers and Optical Activity

Properties of Enantiomers and Optical Activity

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,...

Molecules with Multiple Chiral Centers

Molecules with Multiple Chiral Centers

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...

Prochirality

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...

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Related Experiment Video

Updated: Dec 24, 2025

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

The chiral nano-world: chiroptically active quantum nanostructures.

Finn Purcell Milton¹, Joseph Govan, Maria V Mukhina

¹School of Chemistry and CRANN, University of Dublin, Trinity College, Dublin 2, Ireland. igounko@tcd.ie.

Nanoscale Horizons

|April 9, 2020

Summary

Chiral nanoparticles are crucial for molecular recognition. This review highlights advances in creating and applying these advanced nanomaterials in fields like medicine and catalysis.

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Area of Science:

Nanoscience and Nanotechnology
Materials Science
Chemistry
Biochemistry
Pharmacology
Medicine

Background:

Chirality is fundamental to molecular recognition, driving demand for chiral nanoparticles across scientific disciplines.
Understanding chirality in nanosystems is vital for advancing nanoscience and nanotechnology.
Stereospecific chiral stabilizing molecules have enabled new approaches in nanocrystal research.

Purpose of the Study:

To review recent progress in the development of chiroptically active quantum nanostructures.
To discuss preparation methods and intrinsic chirality in nanostructures.
To analyze potential applications of chiral nanomaterials.

Main Methods:

Review of recent literature on chiral nanostructures.
Discussion of preparation techniques for chiroptically active quantum nanostructures.
Analysis of structure-property relationships and applications.

Main Results:

Recent advances in synthesizing various chiroptically active quantum nanostructures are presented.
Intrinsic chirality arising from defects like screw dislocations is considered.
Potential applications in sensing, catalysis, cell imaging, and spintronics are analyzed.

Conclusions:

Chiroptically active quantum nanostructures offer significant potential across diverse scientific fields.
Continued research into their synthesis and properties will drive future innovations.
Chiral nanomaterials are poised to impact areas from medicine to advanced electronics.