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Videos de Conceptos Relacionados

Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
10.8K
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

18.3K
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
18.3K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

5.5K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the...
5.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

8.0K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
8.0K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.4K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.5K

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Updated: May 2, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

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Diimidas de hexaceno

Xiaoping Cui1,2, Chengyi Xiao3, Thorsten Winands4

  • 1Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry , Tsinghua University , Beijing 100084 , China.

Journal of the American Chemical Society
|August 23, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores sintetizaron grandes diimidas de hexaceno (HDI) con una mejor solubilidad y estabilidad. Estos semiconductores orgánicos novedosos muestran brechas de banda significativamente más pequeñas y un excelente rendimiento en los transistores orgánicos de efecto de campo (OFET).

Videos de Experimentos Relacionados

Last Updated: May 2, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

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Área de la Ciencia:

  • Química orgánica
  • Ciencias de los materiales
  • Física de los semiconductores

Sus antecedentes:

  • Las imidas de aceno ofrecen un potencial de brechas de banda más pequeñas en comparación con los acenos, con una solubilidad y estabilidad mantenidas.
  • La síntesis de grandes imidas de aceno sigue siendo un desafío importante en el desarrollo de materiales.

Objetivo del estudio:

  • Desarrollar una síntesis fácil para las grandes imidas de aceno, específicamente las diimidas de hexaceno (HDIs).
  • Investigar las propiedades electrónicas y físicas de los IDH sintetizados.
  • Evaluar el rendimiento de los HDI en los transistores orgánicos de efecto de campo (OFET).

Principales métodos:

  • Estrategia de síntesis de una sola olla que incluye doble anulación aromática.
  • Se utilizan como precursores el zirconabenzociclopenteno y las diimidas de naftaleno tetrabromadas.
  • Fabricación y caracterización de transistores orgánicos de efecto de campo (OFET) mediante micro cintas HDI.

Principales resultados:

  • Diimidas de hexaceno (HDIs) sintetizados con éxito mediante un nuevo método de un solo recipiente.
  • Los IDH con cadenas alquilo ramificadas demostraron una excelente solubilidad y estabilidad.
  • Alcanzó espacios de banda significativamente más pequeños en comparación con el hexaceno.
  • Los OFET basados en micro cintas HDI exhibieron transporte ambipolar con alta movilidad de electrones (2.17 cm2 V-1 s-1) y movilidad de agujeros (0.30 cm2 V-1 s-1).

Conclusiones:

  • La síntesis de un solo recipiente desarrollada proporciona una ruta efectiva para las grandes imidas de aceno.
  • Los IDH sintetizados poseen propiedades electrónicas deseables para aplicaciones electrónicas orgánicas.
  • Las altas movilidades de los portadores de carga indican el potencial de los HDI en dispositivos OFET avanzados.