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Videos de Conceptos Relacionados

Chirality02:25

Chirality

30.0K
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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Chirality in Nature02:30

Chirality in Nature

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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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Molecules with Multiple Chiral Centers02:25

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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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Prochirality02:05

Prochirality

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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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Fischer Projections02:18

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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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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Arquitectura coloidal quiral tridimensional autoensamblada

Matan Yah Ben Zion1, Xiaojin He2, Corinna C Maass2,3

  • 1Department of Physics, New York University, New York, NY 10003, USA. matanbz@nyu.edu chaikin@nyu.edu.

Science (New York, N.Y.)
|November 4, 2017
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores programaron grupos coloidales de tamaño micrométrico para autoensamblarse con información estructural a nanoescala. Este avance combina la nanotecnología del ADN y la ciencia coloidal, lo que permite un control preciso de la geometría y la quiralidad de las microconstrucciones.

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Área de la Ciencia:

  • * Investigación interdisciplinaria que une la nanotecnología, la ciencia de los materiales y la química.
  • * Centrarse en la estereoquímica y el autoensamblaje a escala microscópica.

Sus antecedentes:

  • * La estereoquímica, el estudio de los arreglos moleculares en 3D, se ha limitado tradicionalmente a la nanoescala.
  • * Existe la necesidad de extender el control estereoquímico a estructuras de tamaño micrométrico más grandes.

Objetivo del estudio:

  • * Programar el autoensamblaje de grupos coloidales de tamaño micrométrico utilizando información estructural a nanoescala.
  • * Para demostrar el control preciso de la geometría y la quiralidad de las microconstrucciones tridimensionales.

Principales métodos:

  • * Integración de la nanotecnología del ADN, específicamente el origami del ADN, con la ciencia coloidal.
  • * Utilizando la flexibilidad funcional del origami de ADN y la rigidez de las partículas coloidales para el autoensamblaje programado.

Principales resultados:

  • * Autoensamblaje paralelo exitoso de microconstrucciones tridimensionales.
  • * Geometría altamente específica, incluido el control de la posición y los ángulos diédricos.
  • * Control demostrado de la quiralidad de los micro racimos resultantes.

Conclusiones:

  • * El estudio extiende con éxito el control estereoquímico de la nanoescala a la microscala.
  • * Este nuevo enfoque permite la creación de microestructuras complejas y definidas geométricamente.
  • * Ofrece nuevas posibilidades para el diseño y la fabricación de materiales con propiedades quirales específicas a nivel de micrones.