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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...

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 at Nitrogen, Phosphorus, and Sulfur

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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...

Molecules with Multiple Chiral Centers

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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...

Radical Halogenation: Stereochemistry

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

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Directional Crystal Jumping Controlled by Chirality.

Yifu Chen¹, Jiaxing Zhang², Jie Zhang¹

¹Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.

Journal of the American Chemical Society

|March 13, 2024

Summary

This summary is machine-generated.

Chiral crystals of asparagine monohydrate exhibit directional jumping when heated, demonstrating molecular chirality

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Area of Science:

Crystallography
Materials Science
Chemical Physics

Background:

Molecular chirality is fundamental to chemical and biological systems.
Understanding the macroscopic consequences of molecular chirality is an ongoing scientific challenge.

Purpose of the Study:

To investigate the role of molecular chirality in directing macroscopic crystal motion.
To explore the potential of chiral crystal dynamics for applications such as chiral resolution.

Main Methods:

Synthesis and characterization of racemic asparagine monohydrate crystals.
Controlled heating experiments to observe crystal behavior.
Analysis of crystal structure and hydrogen-bonding networks.

Main Results:

Single crystals of asparagine monohydrate exhibit directional jumping when heated.
Enantiomorphs of the crystals jump in opposite directions.
Directional jumping is attributed to oriented channels facilitating water molecule escape during dehydration.

Conclusions:

Molecular chirality is a key factor governing the direction of macroscopic crystal motion.
Chiral crystal jumping offers a novel method for chiral resolution.
Findings provide a basis for developing actuation systems using dynamic crystals and understanding chirality-motion correlations.