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Videos de Conceptos Relacionados

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 Reactivity: Steric Effects01:10

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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...
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Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.9K
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 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: Addition00:47

Radical Formation: Addition

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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...
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Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer
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Anarmonía multestructural controla el proceso de generación de radicales en la combustión de biocombustibles

Lili Xing1,2, Zhandong Wang3, Donald G Truhlar2

  • 1Energy and Power Engineering Institute , Henan University of Science and Technology , Luoyang , Henan 471003 , China.

Journal of the American Chemical Society
|October 23, 2019
PubMed
Resumen

Este estudio calcula las velocidades de reacción del isopentanol con los radicales OH, cruciales para comprender la combustión de los biocombustibles y la química atmosférica. Los hallazgos destacan la importancia de los métodos computacionales avanzados para obtener datos cinéticos precisos.

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Área de la Ciencia:

  • Química de la combustión
  • Química de la atmósfera
  • Química computacional

Sus antecedentes:

  • El isopentanol es un biocombustible sostenible con una química de combustión compleja.
  • Los datos experimentales sobre la cinética de reacción del isopentanol con los radicales OH son limitados.
  • Comprender estas reacciones es vital tanto para la degradación atmosférica como para el modelado de la combustión.

Objetivo del estudio:

  • Calcular las constantes de velocidad y las fracciones de ramificación para la reacción de abstracción de hidrógeno del isopentanol por radicales OH.
  • Para cubrir un amplio rango de temperaturas relevante para la química atmosférica y la combustión.
  • Proporcionar datos termoquímicos y cinéticos esenciales para el isopentanol.

Principales métodos:

  • Teoría del estado de transición variacional de múltiples vías utilizada (MP-VTST).
  • Combinado con cálculos electrónicos de la estructura para determinar los datos termoquímicos.
  • Incorporación de túneles multidimensionales, anharmonía de estructuras múltiples y anharmonía de potencial de torsión para cálculos de velocidad precisos.

Principales resultados:

  • Las constantes de velocidad dependientes del sitio y las fracciones de ramificación para las reacciones isopentanol-OH.
  • Determinación de los datos termoquímicos no disponibles anteriormente.
  • Demostró el impacto significativo del recrudecimiento, el túnel y las estructuras múltiples en las tasas de reacción.

Conclusiones:

  • La inharmonía de la estructura múltiple es la corrección más crítica de la teoría convencional de los estados de transición para este sistema.
  • Los efectos de recruzamiento y túnel influyen significativamente en las tasas de reacción y requieren un tratamiento preciso.
  • Los datos generados son indispensables para la predicción de la degradación atmosférica del alcohol y el mecanismo de combustión de los biocombustibles.