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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...

Metal-Semiconductor Junctions

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...

Racemic Mixtures and the Resolution of Enantiomers

Racemic Mixtures and the Resolution of Enantiomers

A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...

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...

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...

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

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Chiral light-matter interactions in solution-processable semiconductors.

Zachary A VanOrman^1,2, Winald R Kitzmann^1,3, Antti-Pekka M Reponen¹

¹Rowland Institute, Harvard University, Cambridge, MA, USA.

Nature Reviews. Chemistry

|February 17, 2025

Summary

This summary is machine-generated.

Chiral semiconductors offer new functionalities for spin-optoelectronics by enabling asymmetric light and spin interactions. These solution-processable materials pave the way for advanced applications in displays, imaging, and quantum technologies.

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Area of Science:

Materials Science
Condensed Matter Physics
Organic Electronics

Background:

Chirality, a property of non-superimposable mirror images, is fundamental in nature and influences material properties.
Chiral materials enable asymmetric interactions with light and spin, crucial for advanced functionalities.
Spin-optoelectronics and quantum information technologies benefit from chiral properties.

Purpose of the Study:

To review the emerging field of solution-processable chiral semiconductors.
To explore the interplay between chirality, light, charge, and spin in these materials.
To highlight current and future applications of chiral semiconductors.

Main Methods:

Discussion of various types of solution-processable chiral semiconductors (small molecules, polymers, supramolecular assemblies, halide perovskites).
Examination of chiral light-matter interactions and their mechanisms.
Overview of characterization techniques for chiral semiconductors.

Main Results:

Solution-processable chiral semiconductors offer tunable light-matter interactions.
Chirality enables simultaneous control of light, charge, and spin.
Diverse material classes exhibit promising chiral properties.

Conclusions:

Chiral semiconductors are a versatile platform for next-generation spin-optoelectronic devices.
Potential applications span energy-efficient displays, advanced imaging, and enantioselective chemistry.
Further research into chiral semiconductor design and application is warranted.