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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 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...

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.

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...

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Updated: Feb 28, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Chiral Responsive Liquid Quantum Dots.

Jin Zhang¹, Junkai Ma^1,2, Fangdan Shi¹

¹Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, 430079, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|June 22, 2017

Summary

This summary is machine-generated.

This study introduces novel liquid quantum dots (liquid QDs) that exhibit selective chiral responses. These smart materials offer potential for advanced chiral fluidic sensors and separation technologies.

Keywords:

chiral responsiveness chiral separation fluidic behaviors liquid quantum dots

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Production and Targeting of Monovalent Quantum Dots

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Published on: October 23, 2014

Area of Science:

Materials Science
Supramolecular Chemistry
Nanotechnology

Background:

Converting weak chiral interactions into macroscopic material properties is a significant scientific challenge.
Developing responsive materials that can detect chirality is crucial for various applications.
Quantum dots (QDs) offer unique optical properties but integrating them with chiral responsiveness is complex.

Purpose of the Study:

To develop highly fluorescent, selectively chiral-responsive liquid quantum dots (liquid QDs).
To investigate the hydrophobic interactions enabling chiral recognition in a solvent-free system.
To explore the potential of these liquid QDs in chiral sensing and separation.

Main Methods:

Synthesis of oleic acid-stabilized quantum dots functionalized with chiral chains, designated as (S)-1810-QDs.
Characterization of fluorescence properties and fluidic behavior using fluorescence spectroscopy and thermal control.
Evaluation of chiral selectivity by testing responses to specific chiral molecules, such as (1R, 2S)-2-amino-1,2-diphenyl ethanol.

Main Results:

Demonstrated highly fluorescent and fluidic behavior of (S)-1810-QDs in a solvent-free state.
Achieved highly selective chiral response of (S)-1810-QDs towards a specific chiral molecule.
Established a mechanism based on hydrophobic interactions between chiral chains and QDs for chiral recognition.

Conclusions:

The developed (S)-1810-QDs successfully convert weak chiral interactions into observable macroscopic properties.
These liquid QDs show promise for the construction of smart chiral fluidic sensors.
The material presents an attractive platform for advanced chiral separation applications.