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Videos de Conceptos Relacionados

Chirality02:25

Chirality

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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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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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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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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 in Nature02:30

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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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Radical Halogenation: Stereochemistry01:33

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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Modificación covalente dinámica de postclustering para el control de la quiralidad y la detección quiral.

Yang Yang1, Xiao-Li Pei, Quan-Ming Wang

  • 1State Key Lab of Physical Chemistry of Solid Surfaces Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian, People' s Republic of China.

Journal of the American Chemical Society
|October 2, 2013
PubMed
Resumen

Los investigadores desarrollaron un nuevo método para crear materiales funcionales utilizando racimos de oro y plata. Esta estrategia de modificación postclustering (PCM) permite el reconocimiento quiral y la sintonización de propiedades en materiales avanzados.

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Área de la Ciencia:

  • Química Inorgánica La Química Inorgánica es la química inorgánica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.

Sus antecedentes:

  • Los materiales funcionales basados en clústeres ofrecen estructuras y propiedades sintonizables.
  • La modificación postclustering (PCM) permite la adaptación de propiedades a través de la modificación del grupo funcional del clúster.

Objetivo del estudio:

  • Para sintetizar un nuevo clúster de oro-plata con sitios reactivos para la modificación postclustering.
  • Para lograr la transferencia de quiralidad de las monoaminas quirales al grupo oro-plata.
  • Explorar la aplicación de estos grupos quirales en el reconocimiento quiral y la determinación del exceso enantiomérico (ee).

Principales métodos:

  • Síntesis de un grupo oro-plata funcionalizado con aldehídos utilizando una estrategia de protección-desprotección.
  • Modificación postclustering (PCM) a través de la formación dinámica de enlaces iminos covalentes con las monoaminas quirales.
  • Confirmación de la homociralidad mediante determinación estructural de rayos X y espectroscopia de dicroísmo circular (CD).

Principales resultados:

  • Se sintetizó con éxito un nuevo grupo oro-plata con seis sitios reactivos de aldehído.
  • La quiralidad se transfirió efectivamente de las monoaminas quirales al grupo oro-plata, formando grupos homoquirales.
  • Se observaron señales de CD intensas, lo que demuestra el potencial para el reconocimiento quiral y la determinación del valor de ee.

Conclusiones:

  • La prefuncionalización de los clústeres y la estrategia de PCM proporcionan un enfoque versátil para el diseño de materiales de clúster funcionales.
  • Este método abre nuevas vías para crear materiales avanzados con propiedades y aplicaciones a medida en la detección quiral.