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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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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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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.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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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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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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Control de la quiralidad de la transferencia de electrones en ensamblajes de puntos cuánticos

Brian P Bloom1, Brittney M Graff1, Supriya Ghosh1

  • 1Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.

Journal of the American Chemical Society
|June 14, 2017
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Resumen

La quiralidad molecular impacta significativamente las tasas de transferencia de electrones entre los puntos cuánticos (QD). El estudio revela que tanto la polarización de la luz como la quiralidad QD influyen en la cinética de transferencia de electrones, ofreciendo un nuevo control sobre el flujo de carga.

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Área de la Ciencia:

  • La electrónica molecular
  • Conjuntos de puntos cuánticos
  • Transporte de carga dirigido por quiralidad

Sus antecedentes:

  • El espín del electrón y la quiralidad molecular son factores clave para controlar el flujo de carga a nanoescala.
  • Los puntos cuánticos (QD) ofrecen una plataforma versátil para estudiar los fenómenos de transferencia de carga.

Objetivo del estudio:

  • Investigar la influencia de la quiralidad molecular en las tasas de transferencia de electrones entre puntos cuánticos.
  • Para explorar el papel de la polarización de la luz y la quiralidad QD en la cinética de transferencia de electrones.

Principales métodos:

  • Fabricación de conjuntos de puntos cuánticos quirales.
  • Excitación de los donantes de electrones con luz polarizada circularmente.
  • La medición de las tasas de transferencia de electrones entre puntos cuánticos.
  • Análisis de los espectros de dicroísmo circular (CD) de las QD.

Principales resultados:

  • La quiralidad molecular induce efectos de orden de magnitud en las tasas de transferencia de electrones en los conjuntos QD.
  • Tanto la polarización de la luz de excitación como la quiralidad QD del aceptador modulan la cinética de transferencia de electrones.
  • Se definió una polarización para la constante de velocidad de transferencia de electrones y se correlacionó con la fuerza del espectro QD CD del aceptor.

Conclusiones:

  • La fuerza del dicroísmo circular (CD) de las transiciones de excitón QD puede predecir la transferencia de electrones dependiente del espín.
  • La impresión quiral de los puntos cuánticos es probablemente el mecanismo subyacente para la transferencia de electrones dependientes del espín.
  • Estos hallazgos abren caminos para el diseño de sistemas moleculares quirales para el transporte de carga controlado.