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Chirality in Nature02:30

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...
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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.
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...
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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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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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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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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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Quiralidad emergente en el hielo de espín artificial.

W R Branford1, S Ladak, D E Read

  • 1Blackett Laboratory, Imperial College, London, UK. w.branford@imperial.ac.uk

Science (New York, N.Y.)
|March 31, 2012
PubMed
Resumen
Este resumen es generado por máquina.

El hielo de espín artificial exhibe fases magnéticas exóticas y formación de bucle quiral. Las mediciones de magnetotransporte revelan una señal Hall anómala vinculada a estos estados topológicos inducidos por bordes.

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Área de la Ciencia:

  • Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada Física de la materia condensada
  • El magnetismo es el magnetismo.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los sistemas de hielo de espín artificial (ASI) exhiben comportamientos magnéticos complejos debido a la frustración geométrica.
  • Las fases exóticas, incluidos los monopolos magnéticos y las texturas de espín quiral, se predicen en ASI.

Objetivo del estudio:

  • Para investigar las propiedades de magnetotransporte de las estructuras ASI de panal conectadas.
  • Explorar la relación entre la formación del bucle quiral y los efectos anómalos de Hall en ASI.

Principales métodos:

  • Fabricación de matrices de barras ferromagnéticas planas nanoestructuradas en una red de nido de abeja.
  • Mediciones de magnetotransporte, incluidas las mediciones del efecto Hall anómalo (AHE).

Principales resultados:

  • Se observó una señal anómala de Hall a 50 Kelvin en ASI de panal conectado.
  • La temperatura de inicio se correlaciona con la fase de hielo dipolar de largo alcance.
  • Se identificaron bucles quirales que se forman en los bordes de la muestra como la fuente de la señal topológica de Hall.

Conclusiones:

  • La estructura de borde en nanoarrays proporciona una ruta para diseñar estados topológicos exóticos en hielo de espín artificial.
  • Los sistemas ASI ofrecen una plataforma para el estudio de fenómenos emergentes como el orden quiral y el transporte topológico.