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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 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

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...

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:

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...

Thermal Electrocyclic Reactions: Stereochemistry

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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Temperature-Dependent Chirality in Halide Perovskites.

Mike Pols¹, Geert Brocks^1,2, Sofía Calero¹

¹Materials Simulation & Modelling, Department of Applied Physics and Science Education, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands.

The Journal of Physical Chemistry Letters

|July 31, 2024

Summary

This summary is machine-generated.

Chiral organic cations induce chirality in 2D metal halide perovskites, creating unique optical and spin properties. Temperature affects chirality transfer from organic cations to inorganic layers due to hydrogen bond breaking.

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Area of Science:

Materials Science
Solid-State Physics
Organic Chemistry

Background:

Two-dimensional metal halide perovskites exhibit unique optoelectronic properties.
Incorporating chiral organic cations induces chirality in these materials.
Temperature significantly influences the chiral properties of these semiconductors.

Purpose of the Study:

To investigate the temperature dependence of chirality in 2D metal halide perovskites.
To identify key descriptors for characterizing perovskite chirality.
To understand the mechanism of chirality transfer between organic and inorganic components.

Main Methods:

Density functional theory (DFT) calculations.
On-the-fly machine learning force fields.
Molecular dynamics (MD) simulations.
Analysis of chiral descriptors (e.g., MBA2PbI4).

Main Results:

Organic cation arrangements maintain chirality at higher temperatures.
The inorganic perovskite framework loses chirality more rapidly with increasing temperature.
Breaking of hydrogen bonds between organic and inorganic units is identified as the cause.

Conclusions:

Chirality transfer from organic cations to inorganic layers is temperature-dependent.
Hydrogen bond dynamics are crucial for maintaining chirality in the inorganic framework.
Understanding these mechanisms is key for designing chiral perovskite-based devices.