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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
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.1K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
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.
2.9K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.8K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.8K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.3K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
3.3K

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相关实验视频

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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两合一的策略,用于光诱导原子转移激进聚合,使用Cu(I) - 提亚集成的共价有机框架.

Qiongshan Zhang1,2, Congying Song1, Xue Li1

  • 1College of Chemistry and Molecular Sciences, State Key Laboratory of Power Grid Environmental Protection, Wuhan University, Wuhan, Hubei, 430072, China.

Angewandte Chemie (International ed. in English)
|November 4, 2025
PubMed
概括

我们开发了新型含铜的共价有机框架 (COFs),以实现高效的光催化. 这些材料能够实现快速,可回收的聚合,克服了工业聚合物生产的关键挑战.

关键词:
大规模的聚合物生产生产.在照片ATRP.可回收的可回收性两个合一的催化剂.

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 催化剂是一种催化剂.

背景情况:

  • 开发高效的光催化剂 (PCs) 快速反应和易于回收对于大规模的聚合物生产至关重要.
  • 目前用于光诱导原子转移基聚合的异质PC面临性能和可回收性的局限性.

研究的目的:

  • 设计和合成新的"二合一"光催化剂,用于增强光ATRP.
  • 为了实现工业聚合物合成的高催化效率,稳定性和可回收性.

主要方法:

  • 合成的二胺结合的共价有机框架 (COFs) 包含一个循环三核Cu (I) 复合体.
  • 评估了含有Cu (I) 的COF在水性光ATRP中的性能.
  • 评估了微型反应器中的催化剂稳定性,回收和过程兼容性.

主要成果:

  • 含有的COF显示了创纪录的1640的营业额 (TON) 和82分钟-1.1的营业频率 (TOF).
  • 实现了狭窄的聚合物分散性 (Đ = 1.20),表明受控的聚合.
  • 证明了卓越的运行稳定性和接近量化的催化剂回收.
  • 实现了可扩展的,无需中间净化的块共聚合物的单合成.

结论:

  • "二合一"的COF设计为光ATRP提供了一个高效和可回收的催化系统.
  • 这些新型材料对可持续和可扩展的聚合物制造有显著的前景.
  • 证明的工艺兼容性凸显了它们在工业应用中的潜力.