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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...

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...

Stereoisomerism

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...

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...

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...

Radical Halogenation: Stereochemistry

Radical Halogenation: Stereochemistry

Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:

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Related Experiment Video

Updated: May 19, 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 Molecular Intercalation Enables Light-Controlled 2D Multiferroic Heterostructures.

Zhongxuan Wang¹, Yong Hu², Zhenyao Fang³

¹Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742. United States.

|May 18, 2026

Summary

Researchers developed chiral 2D multiferroics using molecular intercalation. This strategy enhances magnetic and ferroelectric properties, enabling light-controlled spintronic devices at room temperature.

Keywords:

Chiral 2D multiferroics Circularly polarized light Magnetoelectric coupling Molecular intercalation

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

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Chiral materials and multiferroics offer unique symmetry-controlled functionalities.
Integrating these properties into 2D systems is challenging due to temperature limitations and simultaneous property sustainment.
Existing 2D systems struggle to maintain chirality, ferroelectricity, and ferromagnetism concurrently at practical temperatures.

Purpose of the Study:

To engineer novel chiral 2D multiferroics by overcoming integration challenges.
To develop a general strategy for creating light-responsive 2D multiferroic heterostructures.
To enable optically tunable magnetoelectric and spintronic devices.

Main Methods:

Introduced a chiral molecular intercalation strategy.
Inserted enantiomeric molecules into layered ferroelectric CuInP2S6 and ferromagnetic Fe3GaTe2.
Analyzed the effects of molecular insertion on interfacial electrostatics, charge distribution, and interlayer spacing.

Main Results:

Achieved enhanced ferroic order, including a 5-fold increase in magnetic anisotropy energy (0.35 to 1.6 meV/Fe) and strengthened ferroelectric polarization.
Constructed chiral CIPS-FGT heterostructures exhibiting robust room-temperature magnetoelectric coupling (approx. 4.8% magnetization modulation).
Demonstrated helicity-dependent control of ferroic states using circularly polarized light, resulting in a 54.4% resistance modulation.

Conclusions:

Molecular intercalation is a viable general strategy for engineering advanced 2D multiferroics.
The developed chiral 2D multiferroics exhibit significant room-temperature magnetoelectric coupling.
These materials enable light-responsive spintronic devices with tunable properties.