pHに依存するH2活性化サイクルと,CpIr複合体による窒素イオンの還元と組み合わせた
Seiji Ogo1, Hidetaka Nakai, Yoshihito Watanabe
1Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.
Journal of the American Chemical Society
|January 24, 2002
まとめ
この研究では,CpIr複合体を用いてpHに依存した水素活性化が示され,異解性H2分裂と窒素還元を含む触媒サイクルが促進されています. このプロセスは,pHのグラデーションを通して繰り返される反応を可能にします.
科学分野:
- 有機金属化学 有機金属化学
- カタリシス カタリシス カタリシス
- 無機化学 無機化学とは
背景:
- CpIr複合体は,触媒として知られている.
- 水素の活性化は,触媒の重要な反応である.
- pHのコントロールは,多くの化学プロセスにおいて極めて重要です.
研究 の 目的:
- CpIr複合体によるpH依存型水素活性化を調査する.
- ヘテロリティックなH2分裂のメカニズムを探求する.
- H2活性化と窒素還元を含む繰り返し可能な触媒サイクルを開発する.
主な方法:
- 酸性水溶液中の[CpIr (III) (H2O) ]3]2+を用いたヘテロリティックなH2活性化.
- 複雑な溶解性と反応性を制御するためのpH操作.
- 水素の起源を追跡するためのD-ラベリング実験.
- 窒素還元とヒドリドリガンド酸化を組み合わせた.
主要な成果:
- CpIr複合体は,pH依存のH2活性化を促進する.
- H2活性化と窒素還元を含む触媒サイクルが確立されました.
- このサイクルは,pHのグラデーションを1から-1.1の範囲で調整することで繰り返されます.
- D-ラベリングは,H2進化におけるヒドリドリガンドの役割を確認した.
結論:
- CpIr複合体は,pH主導の触媒サイクルを媒介することができる.
- このサイクルでは,水素の活性化と窒素の減少を組み合わせている.
- この研究は,pHの梯度を用いた触媒変換に対する新しいアプローチを提供します.
関連する概念動画
The Citric Acid Cycle
The citric acid cycle, also known as the Krebs cycle or TCA cycle, consists of several energy-generating reactions that yield one ATP molecule, three NADH molecules, one FADH2 molecule, and two CO2 molecules.
Electron Transport Chains
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
Electron Transport Chain: Complex I and II
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
Role of Reduced Coenzymes NADH and FADH₂
The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
Electron 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...
The Citric Acid Cycle: Output
The citric acid cycle is termed an amphibolic pathway as it operates both anabolically and catabolically. The cyclic reactions balance the flux of the substrates to provide an optimal concentration of NADH and ATP to the cell.
Regulation of Citric Acid Cycle
The citric acid cycle is regulated in several ways, including feedback inhibition, regulation of enzyme activities, and associated anaplerotic or cataplerotic pathways.
The primary substrate of the TCA cycle—acetyl CoA—is produced by the...
Regulation of Citric Acid Cycle
The citric acid cycle is regulated in several ways, including feedback inhibition, regulation of enzyme activities, and associated anaplerotic or cataplerotic pathways.
The primary substrate of the TCA cycle—acetyl CoA—is produced by the...
![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)

![[(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)