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Videos de Conceptos Relacionados

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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 double...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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.
Selection Rules: Photochemical Activation
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Perturbaciones hiperconjugativas e inductivas en poli (p-fenileno vinileno) y poli (p-fenileno vinileno)

Youngmi Kim1, Zhengguo Zhu, Timothy M Swager

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Journal of the American Chemical Society
|January 15, 2004
PubMed
Resumen

Los investigadores desarrollaron nuevos polímeros con alta fluorescencia y afinidad de electrones sintonizables utilizando interacciones hiperconjugativas. Estos nuevos materiales exhiben un apagado selectivo por fluorescencia para detectar analíticos ricos en electrones y deficientes en electrones.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Ciencia de los materiales Ciencia de los materiales.
  • Electrónica orgánica y electrónica orgánica.

Sus antecedentes:

  • Los altos rendimientos cuánticos de fluorescencia en estado sólido son deseables para materiales ópticos avanzados.
  • Ajustar las propiedades electrónicas de los polímeros sin alterar su brecha de banda sigue siendo un desafío.
  • Las interacciones hiperconjugativas ofrecen una vía potencial para la modulación de propiedades.

Objetivo del estudio:

  • Para sintetizar nuevos poli (fenileno vinileno) tridimensionales con afinidad de electrones sintonizables.
  • Para investigar el impacto de las perturbaciones hiperconjugativas en las propiedades de la fluorescencia.
  • Desarrollar sensores fluorescentes sensibles para analitas ricas en electrones y deficientes en electrones.

Principales métodos:

  • Síntesis de nuevos polímeros tridimensionales ((fenileno vinileno) que incorporan [2.2.2] sistemas de anillos bicíclicos.
  • Caracterización de la estructura del polímero y propiedades fotofísicas.
  • Evaluación de las respuestas de apagado de fluorescencia a varios analitos en solución y películas finas sólidas.

Principales resultados:

  • Logrado alto rendimiento cuántico de fluorescencia en estado sólido en los polímeros sintetizados.
  • Demostró la capacidad de ajustar la afinidad de los electrones a través de interacciones hiperconjugativas sin afectar la brecha de banda.
  • Se observaron respuestas de apagado sensorial de fluorescencia diferencial observadas a los analíticos ricos en electrones y deficientes en electrones.

Conclusiones:

  • Los nuevos poli (fenileno vinileno) son prometedores para aplicaciones que requieren alta fluorescencia y propiedades electrónicas sintonizables.
  • Las interacciones hiperconjugativas proporcionan una estrategia efectiva para modular las características del polímero.
  • Estos polímeros muestran potencial como sensores fluorescentes selectivos para diversos analíticos.