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Videos de Conceptos Relacionados

Chirality02:25

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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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...
Prochirality02:05

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 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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Preparation and Photoacoustic Analysis of Cellular Vehicles Containing Gold Nanorods
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Las superestructuras helicoidales Au nanorod con quiralidad diseñada.

Xiang Lan1, Xuxing Lu, Chenqi Shen

  • 1Key Laboratory of Nano-Bio Interface, Division of Nanobiomedicine and i-Lab, CAS Center for Excellence in Brain Science, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences , Suzhou, 215123 China.

Journal of the American Chemical Society
|December 18, 2014
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores crearon superestructuras helicoidales de nanorodo de oro quiral programable (AuNR) utilizando el origami del ADN. Este método permite un control preciso de la quiralidad y el ensamblaje para nanomateriales avanzados.

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Área de la Ciencia:

  • Nanotecnología La nanotecnología es la nanotecnología.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.

Sus antecedentes:

  • La organización de nanomateriales anisotrópicos en superestructuras 3D con propiedades específicas es un desafío significativo en la nanotecnología.
  • El control de la quiralidad en ensamblajes de nanomateriales es crucial para aplicaciones en óptica y electrónica.

Objetivo del estudio:

  • Desarrollar un método programable para construir superestructuras helicoidales de nanorodo de oro anisotrópico (AuNR) con quiralidad a medida.
  • Investigar la influencia de las plantillas de origami de ADN en el ensamblaje y las propiedades quirópticas de las hélices AuNR.

Principales métodos:

  • Utilizando una plantilla de origami de ADN bidimensional con patrones de 'X' específicamente diseñados de cadenas de captura de ADN.
  • Funcionalizando los AuNR con secuencias de ADN complementarias para un posicionamiento preciso en la plantilla de origami.
  • Intercalación de la plantilla de origami de ADN entre AuNR vecinos para formar superestructuras helicoidales.

Principales resultados:

  • Construyó con éxito hélices AuNR de mano izquierda (LH) y derecha (RH) ajustando los patrones 'X' de origami de ADN.
  • Logró un control preciso de la distancia entre varillas (14 nm) y el ángulo entre varillas (45 °), formando hélices de hasta 220 nm de largo con 9 AuNR.
  • Ensamblaje sintonizable de AuNR demostrado (de 2 a 9 AuNR por hélice) mediante el ajuste de la relación molar AuNR/origami.
  • Se observaron intensas actividades quirópticas en las hélices más largas, con un factor de anisotropía máximo de ~0.02.

Conclusiones:

  • El ensamblaje de plantillas de origami de ADN proporciona una ruta programable para fabricar superestructuras quirales anisotrópicas.
  • Esta estrategia permite un control preciso de la quiralidad y las dimensiones de las hélices de nanorodo de oro.
  • El método desarrollado tiene potencial para crear nanoestructuras ópticamente activas para aplicaciones en detección quiral, amplificación de señales y espectroscopia.