一位化学家对表面连接体对等离子金属纳米结构的电子和硬质效应的看法
Yoonhee Kim1, Soohyun Ji1, Jwa-Min Nam1
1Department of Chemistry, Seoul National University, Seoul 08826, South Korea.
Accounts of chemical research
|July 31, 2023
概括
这项研究引入了对等离子体纳米材料的分子视角,将其表面视为金属连接体复合体. 这种方法将化学直觉与物理结合起来,以设计更好的等离子体催化剂和传感器.
科学领域:
- 表面化学 表面化学
- 纳米材料科学 科学 纳米材料科学
- 物理化学 物理化学
背景情况:
- 等离子金属纳米结构限制光,并使强烈的光物质相互作用.
- 等离子体诱导的催化利用储存的光能进行化学反应,突显了了解表面化学的必要性.
- 目前对等离子体行为的理解主要是物理的,缺乏分子级化学洞察力.
研究的目的:
- 通过引入分子视角来弥合等离子体物理学和表面化学之间的差距.
- 将等离子金属纳米结构概念化为金属连接体复合体,以更深入地了解它们的行为.
- 为设计先进的等离子体催化剂和传感器提供框架.
主要方法:
- 将等离子体纳米结构的分子接口视为金属连接体复合体.
- 通过将它们分割成电子和固态贡献来分析连接体效应.
- 通过轨道重叠和系统对称性研究电子效应,重点关注局部表面等离子体共振 (LSPR),扩散速率和热载体转移.
- 通过联结体-联结体和联结体-表面非结合相互作用来检查固体效应.
主要成果:
- 连接体的电子效应,如σ-捐赠,将Fermi水平附近的状态密度转移,改变LSPR.
- π-结合配体通过影响金属-金属结合强度来调节表面扩散速率.
- 金属-联体键的形成通过分子轨道形成促进了直接的热载体转移.
- 立体障碍通过调节连接体包装密度并产生排斥性相互作用来控制表面的可访问性.
结论:
- 将等离子系统视为非定位的分子实体,将化学直觉与物理现象相结合.
- 这种分子接口方法为设计具有增强选择性的等离子催化剂提供了新的途径.
- 允许开发具有更好的化学可控性和特异性的先进传感器.
相关概念视频
Metal-Ligand Bonds
21.0K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.0K
Crystal Field Theory - Octahedral Complexes
26.8K
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...
26.8K
Ligand Binding Sites
12.9K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
12.9K
Complexation Equilibria: The Chelate Effect
555
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
555
Complexation Equilibria: Factors Influencing Stability of Complexes
405
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
405


