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相关概念视频

Metallic Solids02:37

Metallic Solids

18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
Formation of Complex Ions03:45

Formation of Complex Ions

23.5K
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...
23.5K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.2K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.2K
Structural Isomerism02:34

Structural Isomerism

19.1K
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...
19.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.7K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
41.7K
Molecular Models02:00

Molecular Models

38.0K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
38.0K

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相关实验视频

Updated: Jun 11, 2025

A Method to Fabricate Disconnected Silver Nanostructures in 3D
05:45

A Method to Fabricate Disconnected Silver Nanostructures in 3D

Published on: November 27, 2012

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两个维的银异化物框架.

Kaiyue Jiang1, Pu Yan2, Pengfei Shi1

  • 1The Soft2D Lab, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 130 Dongchuan Road, Shanghai, 200240, China.

Angewandte Chemie (International ed. in English)
|October 2, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用银碳键开发了新的2D金属有机框架 (MOFs). 这些MOF有效催化二氧化碳的减少,催化发生在碳部位,而不是银部位.

关键词:
活性碳站点活动碳站点异酸盐是异酸盐中的一种.金属有机框架银,银,银,银,银,银,银,银,银,银,银,银,银,银,银,银这是一个二维的二维空间.

更多相关视频

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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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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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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A Method to Fabricate Disconnected Silver Nanostructures in 3D
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A Method to Fabricate Disconnected Silver Nanostructures in 3D

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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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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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科学领域:

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

背景情况:

  • 金属有机框架 (MOF) 由于其可调节的结构和多种应用而受到广泛研究.
  • 合成具有碳金属协调的MOF,而不是常见的异原子金属协调, presents一个重要的合成挑战.
  • 现有的MOF研究主要集中在异原子-金属链接上,使得碳-金属协调研究不足.

研究的目的:

  • 开发基于碳金属协调的MOF的合理合成策略.
  • 探索新型二维 (2D) MOFs的潜力,使用银碳链接作为电催化剂.
  • 研究由这些新型MOF催化的二氧化碳电还原机制.

主要方法:

  • 在环境条件下通过银 (I) 盐和基于异酸盐的单体之间的协调合成2DMOF.
  • 合成的2DMOF的结构特征,包括晶体分析.
  • 对二维MOF作为CO2转化为CO的催化剂的电化学评估,包括法拉第效率测量和机械学研究.

主要成果:

  • 成功合成了2DMOF,具有具有精确定义的晶体结构和分层AB堆叠的银-碳联系的2DMOF.
  • 合成的二维MOF表现出低至1.42 eV的狭窄带间隙,而不依赖于π-π堆叠.
  • 实现了超过92%的法拉戴效率,用于二氧化碳到二氧化碳的电催化转化,催化主要发生在异化组的碳位点上.

结论:

  • 这项工作引入了一种基于金属-异化物协调的MOF新家族,特别是利用银-碳链接.
  • 这些发现证明了这些新型二维MOF作为有效的二氧化碳减排电催化剂的潜力.
  • 该研究提供了对电催化机制的关键见解,强调了极化碳物种在二氧化碳转化中的作用.