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Videos de Conceptos Relacionados

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

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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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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
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...
2.0K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.5K
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 Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Radical Formation: Addition00:47

Radical Formation: Addition

1.7K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.7K
Radical Formation: Overview01:03

Radical Formation: Overview

2.0K
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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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Dos radicales Blatter cara a cara: una arquitectura diradical restringida

Paulina Bartos1, Dominika Pomikło2, Kadin B Sorenson3

  • 1Faculty of Chemistry, University of Łódź, Tamka 12, 91403 Łódź, Poland.

Journal of the American Chemical Society
|December 20, 2024
PubMed
Resumen

Los investigadores desarrollaron nuevos diradicals estables utilizando un andamio de peri-naftaleno. Estos diradicals exhiben fuertes interacciones a través del espacio y existen como singlets de cáscara abierta en solución, con un isómero interconvirtiendo entre estereoisómeros.

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Área de la Ciencia:

  • Química orgánica
  • Química supramolecular
  • Ciencias de los materiales

Sus antecedentes:

  • Los diradicales orgánicos estables son cruciales para el desarrollo de nuevos materiales magnéticos y electrónicos.
  • Diseñar moléculas con interacciones controladas a través del espacio es clave para afinar las propiedades de los radicales.
  • El andamio de peri-naftaleno ofrece una plataforma única para hacer cumplir geometrías moleculares específicas.

Objetivo del estudio:

  • Para sintetizar y caracterizar nuevos diradicals basados en un andamio de peri-naftaleno.
  • Investigar el estereoisomerismo y las propiedades electrónicas de estos derivados de naftaleno.
  • Para explorar la estabilidad y la dinámica de interconversión de las especies diradical.

Principales métodos:

  • Difracción de rayos X (XRD) para la determinación estructural.
  • Espectroscopia de resonancia paramagnética de electrones de temperatura variable (VT-EPR) para estudiar el comportamiento de los radicales.
  • Espectroscopia UV-vis, electroquímica y estudios cinéticos para la caracterización electrónica y dinámica.
  • Cálculos de la Teoría Funcional de Densidad (DFT) para comprender la estructura electrónica y la energética.

Principales resultados:

  • Se han sintetizado y caracterizado con éxito dos estereoisómeros, anti y syn, de los radicales de naftaleno.
  • Ambos isómeros existen como singlet de cáscara abierta en solución con brechas de energía singlet-triplet distintas (ΔES-T = -3,1 y -3,8 kcal mol-1).
  • El antiisómero se resolvió en enantiómeros y demostró una conversión medible al isómero sin con una barrera de energía libre (ΔG ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡ ‡).

Conclusiones:

  • El andamio de peri-naftaleno aplica efectivamente una disposición cofacial de los radicales de Blatter, lo que lleva a diradicales estables con interacciones significativas a través del espacio.
  • El estudio proporciona una comprensión completa del estereoisomerismo, las propiedades electrónicas y el comportamiento dinámico de estos nuevos diradicales.
  • Estos hallazgos abren nuevas vías para el diseño racional de sistemas de radicales orgánicos estables para aplicaciones avanzadas.