Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.6K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
2.6K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.9K
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...
2.9K
Radical Formation: Addition00:47

Radical Formation: Addition

2.4K
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...
2.4K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

5.3K
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...
5.3K
Radical Formation: Overview01:03

Radical Formation: Overview

2.7K
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...
2.7K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

3.7K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
3.7K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Hydrogen Isotope Exchange in Pyridine Catalyzed by an Iron(II) Imido Complex: Counterion-Directed Regioselectivity.

Angewandte Chemie (International ed. in English)·2026
Same author

Cyaphido Complexes of the Rare-Earth Metals and Their Tetramerization.

Journal of the American Chemical Society·2026
Same author

High Spin Iron-Phosphinidene and Arsinidene Complexes With Attenuated Metal-Ligand Multiple Bond Character.

Angewandte Chemie (International ed. in English)·2026
Same author

En Route to Enantioenriched Quaternary Stereocenters via Lewis Base/Palladium Cooperative Catalysis.

Helvetica chimica acta·2026
Same author

A Crystalline Mono-Coordinate Indium(I)-Phosphaalkenyl.

Angewandte Chemie (International ed. in English)·2026
Same author

Oxo Ligand Insertion into Fe-C Bonds as a Platform for Oxygen Atom Insertion Catalysis.

Journal of the American Chemical Society·2026

Video Experimental Relacionado

Updated: Mar 17, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

11.8K

Diradical orgánico de alto espín con una robusta estabilidad

Nolan M Gallagher1, Jackson J Bauer1, Maren Pink2

  • 1Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States.

Journal of the American Chemical Society
|July 20, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron diradicales orgánicos estables con estados básicos triplet, superando las limitaciones de estabilidad típicas para las tecnologías emergentes. Un diradical se mantuvo estable y pudo sublimarse a altas temperaturas sin descomposición.

Más Videos Relacionados

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

11.3K
Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

9.9K

Videos de Experimentos Relacionados

Last Updated: Mar 17, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

11.8K
Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

11.3K
Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

9.9K

Área de la Ciencia:

  • Química orgánica
  • Ciencias de los materiales
  • Química cuántica

Sus antecedentes:

  • Las moléculas orgánicas de estado fundamental triplet son cruciales para las tecnologías emergentes.
  • Un desafío importante es su limitada estabilidad inherente, que dificulta las aplicaciones prácticas.

Objetivo del estudio:

  • Para sintetizar y caracterizar los nuevos diradicals orgánicos.
  • Investigar la estabilidad de estos dirádicos, particularmente aquellos con estados básicos triplet.

Principales métodos:

  • Síntesis de dos diradicales orgánicos muy distintos.
  • Caracterización de sus propiedades magnéticas y térmicas.
  • Sublimación en alto vacío para evaluar la estabilidad térmica.

Principales resultados:

  • Un diradical orgánico sintetizado exhibe un estado fundamental triple con una constante de acoplamiento de intercambio específica (2J/kB = 234 ± 36 K).
  • Este diradical de alto espín demostró una robusta estabilidad a temperaturas elevadas.
  • El compuesto se sublimó con éxito bajo alto vacío a 140 °C sin descomposición significativa.

Conclusiones:

  • Se pueden lograr diradicales orgánicos estables de estado fundamental triplet.
  • Estos hallazgos allanan el camino para el desarrollo de materiales orgánicos robustos para aplicaciones tecnológicas avanzadas.