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Videos de Conceptos Relacionados

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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Radicals: Electronic Structure and Geometry01:07

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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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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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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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Stereoisomerism02:52

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Naming Enantiomers02:21

Naming Enantiomers

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The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three...
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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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Triángulos isósceles con efecto redox quiral

Siva Krishna Mohan Nalluri1, Zhichang Liu1, Yilei Wu1

  • 1Department of Chemistry and ‡Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|April 13, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron triángulos quirales rígidos a partir de unidades de diimida piromélica (PMDI) y diimida de naftaleno (NDI) para el almacenamiento de energía. Estos materiales exhiben un apilamiento único y un intercambio de electrones, mejorando el rendimiento de las baterías de iones de litio recargables orgánicas con un mayor contenido de NDI.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química orgánica
  • La electroquímica
  • Almacenamiento de energía

Sus antecedentes:

  • Los materiales redox-activos orgánicos de pequeñas moléculas son cruciales para las aplicaciones avanzadas de almacenamiento de energía.
  • El diseño de nuevas arquitecturas moleculares con propiedades electrónicas a medida es un desafío continuo.
  • Las investigaciones anteriores se centraron en triángulos equiláteros con unidades redox idénticas.

Objetivo del estudio:

  • Sintetizar y caracterizar nuevos triángulos isósceles quirales rígidos compuestos por unidades redox no idénticas de diimida piromélica (PMDI) y diimida naftalina (NDI).
  • Investigar las estructuras de estado sólido, las propiedades electrónicas y el montaje supramolecular de estos nuevos materiales.
  • Evaluar su desempeño como materiales activos para electrodos en baterías orgánicas recargables de iones de litio.

Principales métodos:

  • Síntesis y caracterización mediante RMN y difracción de rayos X monocristalino.
  • Análisis electroquímico mediante voltametría cíclica.
  • Espectroscopia de resonancia paramagnética de electrones (EPR) y de doble resonancia electronuclear (ENDOR), con el apoyo de cálculos DFT.

Principales resultados:

  • Se sintetizaron con éxito dos triángulos isósceles quirales rígidos con simetría C2 y geometrías tipo prisma triangular.
  • A diferencia de los triángulos equiláteros, estos triángulos isósceles formaron dímeros apilados π-π específicos NDI-NDI y NDI-PMDI con helicidades opuestas.
  • Los materiales exhibieron aceptación multielectrónica reversible (hasta seis electrones), con electrones no emparejados compartidos selectivamente entre las subunidades NDI.
  • El aumento del contenido de NDI en la estructura molecular se correlacionó con un mejor rendimiento electroquímico de las celdas en baterías de iones de litio.

Conclusiones:

  • Los triángulos isósceles quirales rígidos basados en PMDI y NDI son materiales redox-activos prometedores para baterías orgánicas.
  • El diseño molecular, específicamente la relación entre las unidades NDI y PMDI, influye significativamente en el embalaje en estado sólido y el rendimiento electroquímico.
  • Estos hallazgos proporcionan valiosas relaciones estructura-propiedad para el desarrollo de materiales de almacenamiento de energía orgánica de próxima generación.