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相关概念视频

Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Structural Isomerism02:34

Structural Isomerism

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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...
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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,...
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  • 1School of Materials Science and Engineering, Shandong Key Laboratory of Special Epoxy Resin, Shandong University of Science and Technology Qingdao 266590 China znliu@sdust.edu.cn xueqz@upc.edu.cn jiantian@sdust.edu.cn.

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概括
此摘要是机器生成的。

铜-酸盐金属-有机框架 (MOFs) 中的多态性影响了催化活性. 与它的α-Cu(Pz) 2多态相比, cis 配置的β-Cu(Pz) 2 MOF显著提高了酸盐还原反应的效率.

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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.
  • 电化学 电化学 电化学

背景情况:

  • 金属有机框架 (MOF) 中的多态性是调整催化活动的关键策略.
  • 为了理解MOF中的结构-活动关系,需要隔离地方协调环境的影响.

研究的目的:

  • 合成和描述两个具有不同的协调几何形状的铜-酸盐 (Cu(Pz) 2) 多态体.
  • 研究这些多态体对电催化酸盐还原反应 (NO3RR) 的影响.
  • 阐明控制催化性能的结构属性关系.

主要方法:

  • α-Cu(Pz) 2和β-Cu(Pz) 2多态的合成.
  • 使用合成的MOFs进行酸盐还原反应 (NO3RR) 的电化学评估.
  • 使用X射线衍射和其他技术进行全面的结构表征.
  • 在现场光谱和密度函数理论 (DFT) 计算来探测电子结构和反应机制.

主要成果:

  • 成功合成了两个不同的铜-酸盐 (Cu(Pz) 2) 多态,α-Cu(Pz) 2和β-Cu(Pz) 2.
  • 与α-Cu(Pz) 2 (53.10%) 相比,β-Cu(Pz) 2多态对NO3RR的法拉达效率 (93.33%) 显著更高.
  • DFT计算和现场光谱检测显示,β-Cu(Pz) 2中的cis配置导致了更分散的Cu3d轨道和与酸盐的增强电子合.

结论:

  • MOF多态化提供了一个强大的路线来控制金属中心的局部协调几何和电子结构.
  • 在β-Cu(Pz) 2中的特定协调环境对于NO3RR中高效的酸盐吸附和激活至关重要.
  • 这项研究确立了开发先进的MOF基电催化剂的基本设计原则,以实现可持续的循环化学.