探索一个悬挂的氨基基团在合体的二次协调球上对电催化演化反应的影响
Afsar Ali1, Rajaneesh Kumar Verma1, Avijit Das1
1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. sparia@chemistry.iitd.ac.in.
Dalton transactions (Cambridge, England : 2003)
|April 25, 2024
概括
一个带有三级氨基群的新型复合物有效催化了的进化. 这种质子中继机制增强了催化活性,特别是在较低的pH值下,提供了更好的电催化剂性能.
科学领域:
- 协调化学 协调化学
- 电触媒溶解是一种电触媒.
- 进化反应 (HER) 是一种
背景情况:
- 科巴尔特复合物被研究为生产的潜在电催化剂.
- 连接物设计在调整金属催化剂的活性和稳定性方面发挥着至关重要的作用.
- 靠近金属中心的三级氨基团可以影响催化机制.
研究的目的:
- 合成和表征一种新的 (III) 复合物与具有三级氨基团的双二氧化物联体.
- 为了研究复合物的酸性质.
- 为了评估复合物的电催化性能,用于演化反应 (HER).
主要方法:
- 使用标准化学技术合成和表征复合物.
- 通过电位定位或光谱方法确定酸性质 (pKa值).
- 在水性酸盐缓冲溶液 (PBS) 中进行电催化研究,以测量演变活性 (Ecat/2,超电位,k_obs).
主要成果:
- 一个Co(III) 复合体 (2) 与含有三级氨基的配体 (H2L^NMe2) 已成功合成和表征.
- 该复合体表现出催化演变,在pH 7.0下观察到的速率常数 (k_obs) 为2.6 × 10^3 s^-1 .
- 质子氨基组作为质子继电器,显著增加了pH 4的催化速率,与缺乏氨基组的类似复合物相比.
结论:
- 复合体中的三级氨基组通过促进质子转移来增强电催化的进化.
- 复合体的主要协调球体有助于改善HER活性和催化剂稳定性.
- 这项研究强调了将质子继电站纳入催化剂设计中的潜力,以实现高效的能量转换.
相关概念视频
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
02:34Structural Isomerism
19.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.2K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.6K
03:45Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
02:58Crystal Field Theory - Octahedral Complexes
26.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.4K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
3.3K