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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...
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...
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...
Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...

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A Micropatterning Assay for Measuring Cell Chirality
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A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

Las texturas quirales dentro de los dominios 2D achirales.

Eugenio Jiménez-Millan1, Juan J Giner-Casares, María T Martín-Romero

  • 1Department of Physical Chemistry, University of Córdoba, Campus de Rabanales, E-14014 Córdoba, Spain.

Journal of the American Chemical Society
|November 1, 2011
PubMed
Resumen

Los investigadores crearon una interfaz quiral utilizando una mezcla de tinte y fosfolípidos. Esta monocapa autoensamblada exhibe actividad óptica, demostrando quiralidad supramolecular incluso en estructuras achirales.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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A Micropatterning Assay for Measuring Cell Chirality
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Área de la Ciencia:

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

Sus antecedentes:

  • Las interfaces quirales son cruciales para el reconocimiento biológico y la nanotecnología avanzada.
  • Comprender la formación y las propiedades de las estructuras quirales en las interfaces es esencial.

Objetivo del estudio:

  • Para construir una monocapa Langmuir mixta con actividad óptica.
  • Para investigar los mecanismos de autoensamblaje que impulsan la quiralidad supramolecular.
  • Para demostrar la quiralidad supramolecular dentro de las formas de dominio no quiral.

Principales métodos:

  • Formación de una monocapa de Langmuir mezclada utilizando un tinte activo superficial y un fosfolípido.
  • Caracterización de la actividad óptica de la monocapa.
  • Análisis de los procesos de autoensamblaje a nivel molecular.

Principales resultados:

  • La monocapa mixta exhibió una actividad óptica medible.
  • El autoensamblaje de los grupos de cabezas polares del tinte se identificó como la fuerza impulsora de la quiralidad.
  • La quiralidad supramolecular se confirmó dentro de los dominios que carecen de forma quiral inherente.

Conclusiones:

  • Se fabricó con éxito una nueva interfaz quiral utilizando una mezcla simple.
  • El estudio aclara la base molecular para la quiralidad supramolecular inducida.
  • Este trabajo tiene implicaciones para la detección quiral y el diseño de dispositivos a nanoescala.