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Updated: May 30, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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在共价Pyrene-Thiourea框架上对H2O2和3,4-Dihydroisoquinoline的配对光生成,具有电子推拉效应

Tao Yang1,2, Fantao Kong1, Yue Chen3

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P.R. China.

Angewandte Chemie (International ed. in English)
|January 28, 2025
PubMed
概括

新的无金属共价有机框架 (COFs) 通过配对光催化技术高效地将太阳能转化为过氧化 (H2O2) 和3,4-二化 (DHIQ). 这些pyrene-thiourea COF表现出高产量和选择性,提供了一种绿色化学策略.

关键词:
3,4-二异氨酸氨酸的使用方法共价有机框架是共价有机框架.过氧化是一种过氧化.光催化剂是一种光催化剂.这种类型的氨酸.

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Photochemical Electrocyclic Reactions: Stereochemistry

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.
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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.
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Thermal and Photochemical Electrocyclic Reactions: Overview

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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