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Updated: Jun 28, 2025

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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基于纳夫他林的捐赠者-接受器共价有机框架作为促进光催化作用的电子分布调节器

Zeming Wang1, Qiang Song1, Cheng He1

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian 116024, P. R. China. zhaol@dlut.edu.cn.

Chemical communications (Cambridge, England)
|April 11, 2024
PubMed
概括

一个新的共价有机框架,使用纳夫他林和三,有效调节电子分布. 这种材料增强了光催化反应,如使用绿色光线合zylamine和 thioether氧化.

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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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.
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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.
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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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