![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
在可见光下,由空缺的氧气控制的小型无色有机物的竞争性光氧化
Jianghui Sun1,2, Xiyang Ge1, Yixuan Gao1
1Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University Beijing 100875 China nana@bnu.edu.cn.
Chemical science
|September 26, 2024
概括
这项研究揭示了TiO2上的氧气空缺如何使4-二-1,2-胺的选择性可见光光氧化,有利于C-N合而不是脱. 这种机制提高了有机合成和降解的光催化效率.
科学领域:
- 光催化作用的光催化
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
背景情况:
- 可见光光催化剂为化学合成和降解提供了一个经济的途径.
- 像TiO2这样的半导体光催化剂可以被有机分子敏感化.
- 竞争性光氧化反应的机制,特别是涉及异原子的反应,仍然不清楚.
研究的目的:
- 为了阐明4-二-1,2-二 (o-CAN) 在TiO2.2上可见光光氧化的机制.
- 了解氧空位 (OV) 在指导选择性C-N合脱过程中的作用.
- 调查C-N合产品如何影响进一步的光氧化.
主要方法:
- 在TiO2.2上在现场生成和描述氧气空缺.
- 在TiO2.2上对o-CAN的可见光照射.
- 在线质谱分析以识别中间体和动力学.
- 理论计算 (例如,DFT) 来验证反应路径和能量障碍.
主要成果:
- 在TiO2上对o-CAN的可见光光氧化选择性地产生了C-N合产品,而不是脱.
- 氧气空缺对于减弱基质吸附和激活氧气至关重要.
- 这种C-N合产品起到了二次敏感剂的作用,提高了反应速度.
- 实验和理论数据证实了OVs在控制选择性的作用.
结论:
- 在TiO2上的氧气空缺是实现可见光光氧化o-CAN的选择性C-N合的关键.
- 这些发现为控制竞争性光氧化途径提供了基本的见解.
- 这项工作促进了对有机转化可见光光催化剂的理解.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
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
Selection Rules: Photochemical Activation
1.8K
01:20Radical Autoxidation
2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
01:19Oxidation and Reduction of Organic Molecules
6.2K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.2K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
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.
2.0K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.1K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.1K
01:46Oxidative Cleavage of Alkenes: Ozonolysis
10.0K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.0K