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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.
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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.
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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...
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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.
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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...
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Updated: Sep 10, 2025

A Micropatterning Assay for Measuring Cell Chirality
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Selectividad del espín inducida por la quiralidad: un modelo mínimo

Lorenzo Savi1, Leonardo Celada2,3, D K Andrea Phan Huu2

  • 1Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parma 43124, Italy.

The journal of physical chemistry letters
|August 26, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La selectividad de espín inducida por quiralidad (CISS) es un fenómeno en el que el espín del electrón es seleccionado por moléculas quirales. Este estudio simula el CISS en sistemas moleculares, encontrando amplificación en sistemas no medio llenos y nuevas vías a través de vibraciones.

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Área de la Ciencia:

  • La mecánica cuántica
  • Física de la materia condensada
  • Sistemas moleculares

Sus antecedentes:

  • La selectividad de espín inducida por quiralidad (CISS) es un fenómeno mecánico cuántico poco comprendido.
  • CISS describe la selectividad de espín observada cuando los electrones atraviesan entornos quirales.

Objetivo del estudio:

  • Investigar la selectividad de espín inducida por quiralidad (CISS) en sistemas moleculares utilizando un nuevo enfoque de simulación.
  • Explorar el papel de la correlación de electrones y las vibraciones moleculares en el CISS.

Principales métodos:

  • Se utilizó un enfoque restringido por corriente para simular el transporte de electrones a través de una cadena lineal de Hubbard de orbitales p retorcidos.
  • El modelo incorpora electrones correlacionados acoplados a vibraciones moleculares no adiabáticas.

Principales resultados:

  • Se observaron respuestas CISS mensurables dentro de rangos de parámetros específicos.
  • Se encontró una clara amplificación del CISS en sistemas no medio llenos.
  • Se demostró que las vibraciones de Peierls, particularmente los modos de estiramiento fuera de equilibrio, inducen una polarización finita.

Conclusiones:

  • El método de simulación propuesto modela efectivamente el CISS en sistemas moleculares quirales.
  • La correlación de electrones y las vibraciones moleculares influyen significativamente en el CISS.
  • Los modos vibratorios pueden inducir CISS incluso en sistemas que carecen de interacciones específicas.