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相关概念视频

Metallic Solids02:37

Metallic Solids

18.4K
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....
18.4K
Valence Bond Theory02:42

Valence Bond Theory

8.6K
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...
8.6K
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

28.2K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
28.2K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

32.3K
sp3d and sp3d 2 Hybridization
32.3K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.5K
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...
26.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.6K
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,...
42.6K

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相关实验视频

Updated: Jul 4, 2025

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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一个零价值的团有机框架.

Xiyue Liu1, James N McPherson2, Carl Emil Andersen1

  • 1Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs, Lyngby, Denmark.

Nature communications
|February 8, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用-3 (Pd3) 集群创建了一个新的2D金属有机框架 (MOF). 这种有序的Pd3-MOF作为化的稳定催化剂,可以精确控制金属纳米粒子.

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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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科学领域:

  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.
  • 纳米技术纳米技术

背景情况:

  • 控制纳米金属集群的空间布局对于它们的催化活性至关重要.
  • 现有的分散金属集群的方法往往导致异质性,阻碍了结构-反应性关系研究.
  • 将分子金属集群连接到有序网络中,为创建定义良好的催化站点提供了潜在的解决方案.

研究的目的:

  • 开发一种合成化学定义金属集群的有序数组的方法.
  • 使用预组装的-3 (Pd3) 集群创建一个新的有机金属框架.
  • 研究由此产生的框架的结构性,稳定性和催化性质.

主要方法:

  • 通过连接物交换聚合,轻松合成{Pd3}基于集群的有机金属框架 (Pd3-MOF).
  • 使用ditotic异化物连接物进行框架组装.
  • 使用连续旋转3D电子衍射 (3D-ED) 到~1.0 Å分辨率的结构确定.

主要成果:

  • 从分子三角形-Pd3(CNXyl) 6集群中成功合成了一个二维协调网络,Pd3-MOF.
  • 使用3D-ED. 的纳米晶体有机金属聚合物的明确结构确定.
  • Pd3-MOF表现出具有高热和有氧稳定的Pd(0) 3集群节点.
  • 在化反应中证明了Pd3-MOF的催化活性.

结论:

  • 这项研究展示了一种可行的方法,通过将它们连接到聚合物网络中来创建有序的金属集群阵列.
  • Pd3-MOF是一种稳定,具有催化活性的材料,具有精确控制金属纳米粒子组件的潜力.
  • 这项工作为利用分子金属集群作为先进纳米材料的构建块开辟了道路.