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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical Formation: Overview01:03

Radical Formation: Overview

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
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Radical Formation: Homolysis00:54

Radical Formation: Homolysis

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
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Interruptor de fisión de singlet diradicaloide activado por migración de hidrógeno

Qing Li1,2,3, Yu-He Kan1,2, Hong-Liang Xu1

  • 1Institute of Functional Material Chemistry, National and Local United Engineering Laboratory for Power Batteries, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.

Journal of the American Chemical Society
|June 11, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Diseñamos un interruptor de fisión de singlet (SF) utilizando tautómeros de hidrógeno en tetraazatetracenos. Este método mejora el carácter diradical y reduce los niveles de energía, prediciendo una eficiencia SF superior al 120% para los dispositivos electrónicos.

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Área de la Ciencia:

  • Química teórica
  • Ciencias de los materiales
  • Las instalaciones fotovoltaicas

Sus antecedentes:

  • La fisión de singlet (SF) es un proceso en el que un excitón singlet de alta energía se divide en dos excitones triplet de baja energía.
  • El desarrollo de materiales SF eficientes es crucial para los dispositivos electrónicos avanzados, especialmente en la energía fotovoltaica.
  • El tautomerismo de hidrógeno ofrece una vía potencial para afinar las propiedades electrónicas en las moléculas orgánicas.

Objetivo del estudio:

  • Diseñar teóricamente un nuevo mecanismo de interconversión por fisión de singlet (SF) utilizando tautómeros de hidrógeno.
  • Explorar el potencial de estos sistemas como interruptores en dispositivos electrónicos basados en SF.
  • Establecer reglas de diseño para lograr un SF eficiente mediante la migración de hidrógeno.

Principales métodos:

  • Diseño teórico de la estrategia de conjugación de electrones π.
  • Utilizando la migración de un solo hidrógeno en tetraazatetracenos fusionados con pirazina.
  • Analizando el carácter diradical y los niveles de energía del estado excitado (S0 y T1).

Principales resultados:

  • Se desarrolló una estrategia basada en la migración de un solo hidrógeno para introducir un carácter diradical.
  • Se alcanzaron niveles bajos de E{\subT1}, cruciales para la eficiencia de la SF.
  • Se prevé que la eficiencia SF exceda del 120% en los sistemas de tetraazateno propuestos.
  • Surgió una regla general para el diseño de SF, que vinculaba la migración de hidrógeno con la localización de electrones y la conjugación π.

Conclusiones:

  • El diseño de tautómero de hidrógeno propuesto es eficaz para crear interruptores SF diradicaloides.
  • La migración de un solo hidrógeno es clave para los electrones localizados en el estado S0 y la amplia conjugación π en el estado T1.
  • Esta investigación proporciona un marco valioso para el diseño de futuros materiales SF para aplicaciones fotovoltaicas.