使用基于的分子催化剂与定位的质子继电器的氧化和生产
Aaron D Wilson1, Rachel H Newell, Michael J McNevin
1Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA.
Journal of the American Chemical Society
|January 5, 2006
概括
新的 ((II) 复合物含有循环二素连接体,作为进化和氧化过程中的高效电催化剂. 这些稳定于空气的催化剂利用战略位置的基来促进H-H键的形成和裂变,从而提高了催化率.
科学领域:
- 无机化学 无机化学 有机化学
- 电触媒溶解是一种电触媒.
- 材料科学 材料科学 材料科学
背景情况:
- 开发高效的电催化剂,用于的演化和氧化,对于可再生能源技术至关重要.
- 复合物为贵金属催化剂提供了一个有希望的,具有成本效益的替代品.
- 结合特定的连接体设计可以调整催化活性和稳定性.
研究的目的:
- 设计和合成新型单核 (II) 复合物与循环二氨酸连接体.
- 为了研究这些复合物的电催化活性,用于进化和氧化反应.
- 阐明结构-活性关系,特别是悬浮基的作用.
主要方法:
- 合成稳定在空气中的单核 (II) 复合物与循环二氨酸连接物.
- 进行X射线衍射研究以确定协调几何和结构特征.
- 电化学表征用于评估进化和氧化过程中的催化性能.
- 用光谱分析来了解电子和结构性质.
主要成果:
- 6a和6b两个复合体被合成并进行结构特征,分别揭示了三角形双金字塔形和扭曲方形平面几何形状.
- 复合物6a在酸性介质中作为电催化剂生产的高效率.
- 复合物6b作为基本介质中氧化的电催化剂表现出色.
- 悬挂基与中心的接近与增强的催化活性相关.
结论:
- 设计的 (II) 复合物是高效的电催化剂,用于的演化和氧化.
- 基在联体骨干中的战略定位在促进H-H键激活方面发挥着至关重要的作用.
- 这些发现为开发基于的能源系统的先进电催化剂提供了途径.
相关概念视频
Catalysis
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Catalysis
Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...


