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相关概念视频

Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
568
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.3K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
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一致性是否会影响多电子氧降解反应?

Anu Gupta1, Anil Kumar1, Deb Kumar Bhowmick1

  • 1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.

The journal of physical chemistry letters
|October 12, 2023
PubMed
概括
此摘要是机器生成的。

在氧降解反应 (ORR) 中,有效的电子转移取决于与电子相干性相关的"隐性性质". 这种连贯性对于燃料电池的效率至关重要,并且被分散破坏,形成过氧化.

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科学领域:

  • 电化学 电化学 电化学
  • 量子力学就是量子力学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 氧降解反应 (ORR) 对于燃料电池和生物呼吸中的能量转化至关重要.
  • 有效的ORR需要将四个电子转移到氧气中,这是一个尚未完全理解的复杂过程.
  • 了解电子相互作用是优化ORR催化剂和设备的关键.

研究的目的:

  • 调查控制ORR期间高效电子转移的电子相互作用的性质.
  • 探索电子凝聚力的作用及其对ORR效率的影响.
  • 识别阻碍高效ORR的因素,导致性能降低.

主要方法:

  • 使用了自旋偏振电化学测量.
  • 使用的电极涂有不同厚度的奇拉材料.
  • 开发了一个理论模型来解释观察到的现象.

主要成果:

  • 实验证据证实了一种特定的电子相互作用,称为"隐藏性质",控制ORR效率.
  • 理论建模表明,这种特性与电子之间的连贯相位关系有关.
  • 通过散射破坏电子相干导致过氧化的形成,ORR效率下降.
  • 反应效率波动与性涂层厚度相关,进一步支持连贯性的作用.

结论:

  • 电子相干性在高效的ORR中起着至关重要的作用.
  • 过氧化的形成是破坏电子连贯性和降低ORR效率的指标.
  • 状涂层可以影响电子连贯性,为ORR催化剂设计提供了潜在的途径.