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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.0K
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...
24.0K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.6K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.6K
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...
30.6K
Valence Bond Theory02:42

Valence Bond Theory

11.2K
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...
11.2K
Coordination Number and Geometry02:57

Coordination Number and Geometry

18.9K
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.
18.9K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
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...
1.2K

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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多型宏环盐基二维合金属有机框架

Pei Chen1,2, Mingxuan Liu3, Ruofan Li1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.

Angewandte Chemie (International ed. in English)
|September 13, 2025
PubMed
概括

研究人员开发了一种基于宏观循环的2D合金属有机框架 (SM-MOF-Cu),用于电催化. 这种材料在将乙转化为乙烯方面表现出高效率,促进了可持续的化学合成.

关键词:
电催化化电催化化宏观循环是一种宏观循环.金属有机的框架.多个牙的内部协调站点.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 二维联金属有机框架 (2D c-MOFs) 是电化学应用的有希望的晶体多孔材料.
  • 设计新的有机配体是开发先进的二维c-MOF的关键.
  • 将宏循环纳入二维c-MOF可以创建有益的内在腔,但当前的设计往往与有限的金属离子协调.

研究的目的:

  • 开发一种基于Salphen宏循环的新型三角形2D c-MOF (SM-MOF-Cu) 具有多牙内部协调部位.
  • 为了研究合成的SM-MOF-Cu的电化学特性和催化性能.
  • 探索基于宏循环的2D c-MOF在电催化化反应中的潜力.

主要方法:

  • 基于萨尔芬宏循环的三角形2Dc-MOF (SM-MOF-Cu) 的合成.
  • 关于SM-MOF-Cu的结晶性,多孔性和可访问的金属位点的表征.
  • 用SM-MOF-Cu作为催化剂将乙烯电催化化为乙烯 (E-HAE).

主要成果:

  • SM-MOF-Cu表现出高结晶度,永久多孔性和丰富的可访问金属位点.
  • 该材料在乙烯的电催化化过程中获得了96.6%的高法拉代克效率,用于乙烯生产.
  • 在连续纯乙烯料下,在 -0.85 V 与可逆电极 (RHE) 相比,观察到最佳的催化性能.

结论:

  • 一个基于宏循环的2D c-MOFs的新类成功合成和表征.
  • SM-MOF-Cu在乙到乙烯的电催化化方面表现出了卓越的性能.
  • 这项工作为设计基于宏循环的2D c-MOF用于先进的电催化应用提供了宝贵的见解.