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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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
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Radical Reactivity: Overview01:11

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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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相关实验视频

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The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
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在表面上绘制光化学反应概况

Lukas Michalek1,2, Tim Krappitz1,2, Kai Mundsinger1,2

  • 1School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, QLD 4000, Brisbane, Australia.

Journal of the American Chemical Society
|December 18, 2020
PubMed
概括

这项研究绘制了表面上的光化学反应. 波长解析的反应概况与表面吸收光谱非常相匹配,与四醇和o-甲基甲相异.

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Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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科学领域:

  • 摄影化学
  • 表面科学
  • 聚合物化学

背景情况:

  • 溶液中的光反应组行为往往不同于它们的吸收光谱.
  • 表面吸收光谱与反应性之间的关系在很大程度上未被探索.
  • 了解表面光化学对于表面功能化等应用至关重要.

研究的目的:

  • 开发一种用于绘制表面光化学反应的方法.
  • 调查o-methylbenzaldehyde和tetrazole作为maleimide功能化聚合物的结合伙伴的表面反应性.
  • 将表面反应概况与表面吸收谱进行比较.

主要方法:

  • 将甲基化物和醇部分连接到表面.
  • 使用maleimide功能化的聚合物进行结合.
  • 在特定的波长 (例如330nm) 上照射表面并分析反应性.
  • 测量接种密度和表面覆盖面.

主要成果:

  • 功能化的表面呈现出快速的结合和高的移植密度.
  • 用o-甲甲功能化的基板需要更长的照射时间,并产生更低的表面覆盖率.
  • 与表面吸收光谱直接相关的波长解析反应概况.
  • 观察到的表面反应与之前报告的溶液相红移相相反.

结论:

  • 开发的方法有效地映射了表面的光化学反应性.
  • 表面吸收光谱是表面光化学反应的可靠预测器.
  • 这项工作为基于表面的光化学结合反应提供了关键的见解.