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相关概念视频

Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Valence Bond Theory02:42

Valence Bond Theory

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...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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相关实验视频

Updated: Jun 29, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

八核立体协调子 八核立体协调子

Ian S Tidmarsh1, Thomas B Faust, Harry Adams

  • 1Department of Chemistry, University of Sheffield, UK.

Journal of the American Chemical Society
|October 16, 2008
PubMed
概括
此摘要是机器生成的。

两种新型的双双酸盐桥接配体,L (naph) 和L (anth),与过渡金属形成立方 {M 8L 12} 超分子. 由于pi堆叠相互作用,L (naph) 在极性溶剂中表现出增强的稳定性,与L (anth) 不同.

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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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科学领域:

  • 超分子化学 超分子化学
  • 协调化学 协调化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 开发用于构建复杂的超分子架构的新型连接体.
  • 在自组装子中对金属 - 连接物相互作用的研究.
  • 了解连接体结构对子特性和稳定性的影响.

研究的目的:

  • 合成和描述新的双双酸桥接配体,L (naph) 和L (anth).
  • 使用这些配体和各种过渡金属,探索{M 8L 12} 超分子的自我组装.
  • 研究由L(naph) 与L(anth) 连接体形成的子的结构差异和稳定性.

主要方法:

  • 联结体的合成和表征.
  • 进行X射线晶体学以确定超分子的结构.
  • 光谱技术 (NMR,光) 用于研究子的特性和溶液中的稳定性.
  • 分析金属-连接物协调和分子间相互作用.

主要成果:

  • 成功合成了L ((naph) 和L ((anth) 配体.
  • 用过渡金属 (Cu, Zn, Co, Ni, Cd) 形成立方 {M 8L 12} .
  • 结构阐明揭示了不同的架构:具有螺旋面的L (anth) ,具有S6对称性的L (naph) 和外围pi堆叠.
  • 由于芳香堆叠,与L(anth) 相比,L(naph) 在极性溶剂中表现出更高的稳定性.
  • 对Cd-L ((naph) 的光研究显示了pi堆叠联体的电荷转移辐射.

结论:

  • 具有特定芳香间隔剂的双双酸桥接联体的设计影响了超分子的自我组装和稳定性.
  • 在L ((naph) 中的外围芳香PI堆叠增强了它们在溶液中的结构完整性.
  • 这些发现提供了对强大和功能性的超分子材料的合理设计的见解.