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関連する概念動画

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.6K
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...
2.6K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.3K
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...
2.3K
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...
4.9K
Radical Formation: Overview01:03

Radical Formation: Overview

2.6K
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...
2.6K
Radical Formation: Addition00:47

Radical Formation: Addition

2.1K
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...
2.1K
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes

7.6K
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...
7.6K

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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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バイオ燃料の燃焼過程における多構造的アンハーモニシティ

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
まとめ

この研究は,バイオ燃料の燃焼と大気化学を理解するために重要なOHラジカルとのイソペンタノールの反応速度を計算します. 発見は,正確な運動データのための高度な計算方法の重要性を強調しています.

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科学分野:

  • 燃焼化学
  • 大気化学
  • コンピュータ化学

背景:

  • イソペンタノールは複雑な燃焼化学を備えた 持続可能なバイオ燃料です
  • イソペンタノールとOHラジカルとの反応動態に関する実験データは限られている.
  • これらの反応を理解することは 大気分解と燃焼モデリングの両方に不可欠です

研究 の 目的:

  • イソペンタノールのOH基による水素抽出反応の速度定数と分岐分子を計算する.
  • 大気化学と燃焼に関する幅広い温度範囲をカバーする.
  • イソペンタノールに関する重要な熱化学的および運動的データを提供する.

主な方法:

  • 多経路変数移行状態理論 (MP-VTST) を利用した.
  • 電子構造計算と組み合わせて熱化学データを決定する.
  • 多次元トンネリング,多重構造アンハーモニー性,および正確な速度計算のためのトルションポテンシャルアンハーモニー性が組み込まれています.

主要な成果:

  • イソペンタノール-OH反応のサイト依存の速度定数と分岐分子を計算した.
  • 以前利用できなかった熱化学データを決定した.
  • 反応速度に対する再交差,トンネリング,複数の構造の有意な影響を示した.

結論:

  • 多重構造アンハーモニシティは,このシステムの従来の移行状態理論の最も重要な修正である.
  • リクロス効果とトンネリングは反応速度に大きな影響を及ぼし,正確な処理を必要とする.
  • 生成されたデータは,大気中のアルコール分解とバイオ燃料の燃焼メカニズムの予測に不可欠です.