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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.2K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.6K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.6K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.0K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.0K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.5K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.5K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

4.2K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
4.2K
Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

10.3K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
10.3K

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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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异质水相片切换器 异质水相片切换器

Daniil Sosnin1, Syed Ali Abbas Abedi2, Mohammad Izadyar2

  • 1Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.

Angewandte Chemie (International ed. in English)
|September 10, 2025
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概括
此摘要是机器生成的。

将特定的异循环纳入分子光开关显著影响了它们的开关效率和稳定性. 了解异环基本性和结是设计先进光开关系统的关键.

关键词:
基本性是指基本性的.不同周期的异质环.酸是什么? 酸是什么?照片交换机 照片交换机二次的H-结合.

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科学领域:

  • 分子开关是分子开关.
  • 有机化学 有机化学
  • 光物理学的光学物理学

背景情况:

  • 分子光开关对于先进的应用至关重要.
  • 将异循环纳入光开关支架是最近的一个策略.
  • 基于水的光开关正在接受对财产调节的调查.

研究的目的:

  • 评估 heterocyclic 环对基于水的光开关系统的影响.
  • 检查异循环如何影响光交换效率和可视化稳定性.
  • 建立调整光开关性能的设计原则.

主要方法:

  • 合成新的光开关化合物.
  • 对光交换效率和性能的评估.
  • 使用时间依赖密度函数理论 (TD-DFT) 进行理论计算.
  • 结构与财产关系分析.

主要成果:

  • 具有基本和结合位点 (例如,伊米达) 的异环体表现出低的切换效率和快速的热反异构.
  • 不那么基本的异循环 (例如,本佐醇,本佐醇) 促进反转路径,增强双稳定性.
  • 没有二次结位的子显示出更好的光静止状态,量子产量和红移激活波长.
  • 异环基性,电子捐赠能力和结位点极大地影响光交换效率.

结论:

  • 异环选择对于优化分子光开关性能至关重要.
  • 确定了用于提高水子光开关的双稳定性和效率的设计原则.
  • 这项研究提供了通过合理的异环结合来调整光开关性能的见解.