![[(DPEPhos)(bcp)Cu]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)
控制铜复合体对二氧化碳的催化两电子相比四电子还原的因素
Shunichi Fukuzumi1, Laleh Tahsini, Yong-Min Lee
1Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea. fukuzumi@chem.eng.osaka-u.ac.jp
Journal of the American Chemical Society
|April 3, 2012
概括
一个双核铜复合体有效地催化氧的两电子减小,使用十甲基铁作为减小剂. 这个过程涉及质子化和电子转移步骤,最终产生过氧化并再生催化剂.
科学领域:
- 协调化学 协调化学
- 催化剂是一种催化剂.
- 生物有机化学 生物有机化学
背景情况:
- 减少氧气在生物系统和催化过程中至关重要.
- 铁衍生物是有效的单电子减电剂.
- 双核铜复合体可以模仿酶活性位点.
研究的目的:
- 为了研究双核Cu (II) 复合物的催化机制,以减少氧气.
- 阐明三酸在催化循环中的作用.
- 识别反应中间体和反应途径.
主要方法:
- 在低温下进行光谱分析 (UV-Vis).
- 电子转移反应的动力学研究.
- 铜复合物的电化学表征.
主要成果:
- 双核Cu (II) 复合体, [Cu (II) 2 (LO) 2 (OH) 2+) ],在三酸 (HOTF) 的存在下,催化O (O2) 的二电子还原由十甲基烯 (Fc*) 催化.
- 通过HOTF对复合物的质子化促进了Fc*的减少,通过两步电子转移机制进行.
- 低温研究确定了多 ([Cu(II) ) 和水 ([Cu(II) ) 的中间体.
- 催化循环产生H(2) O(2) 并再生活性催化剂, [Cu(II) ((2) ((LO) ((OTF) ] ((2+).
- 动力分析揭示了两种不同的反应途径,涉及电子转移到混合价值二铜 (II) 中介物.
结论:
- 双核铜复合物有效地催化了O(2) 减少到H(2) O(2) 使用Fc*作为减少剂.
- 三酸在激活催化剂和促进反应方面发挥着关键作用.
- 该研究提供了对铜复合体减少氧气的机制的见解,这与生物无机化学和催化有关.
更多相关视频
12:08Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
Published on: March 18, 2012
08:31Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
Published on: October 3, 2018
相关概念视频
01:24Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
01:27Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
01:43Electron Transport Chain: Complex III and IV
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
01:17Oxidation of Phenols to Quinones
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
02:57Coordination Number and Geometry
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
01:19Oxidation and Reduction of Organic Molecules
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...