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相关概念视频

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
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,...
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.

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相关实验视频

Updated: May 20, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

在二维协调框架中固有的质子导电.

Daiki Umeyama1, Satoshi Horike, Munehiro Inukai

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, Japan.

Journal of the American Chemical Society
|July 13, 2012
PubMed
概括
此摘要是机器生成的。

这项研究证明了新型协调网络中的内在质子导电. 该材料展示了由酸盐连接体旋转促进的格罗特苏斯型质子跳跃.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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相关实验视频

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Published on: July 19, 2019

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学 有机化学
  • 固态化学 固态化学

背景情况:

  • 质子导电对于燃料电池等能源应用至关重要.
  • 开发具有高效质子导电性的新材料是一个持续的挑战.
  • 协调聚合物为功能性质提供可调节的结构.

研究的目的:

  • 合成和描述一种用于质子导电的新型协调聚合物.
  • 为了研究物质内的质子运输机制.
  • 探索协调网络作为质子导体的潜力.

主要方法:

  • 使用 Zn(2+),1,2,4-triazole 和 orthophosphates 合成一个协调聚合物.
  • 这种二维分层化合物的结构特征.
  • 用粉末和单晶的阻抗光谱测量质子导电性.
  • 激活能量的分析以确定导电机制.

主要成果:

  • 成功合成了一种具有2D层结构的新型协调聚合物.
  • 观察到与层相平行的内在质子导电性.
  • 传导机制被确定为Grotthuss类型的质子跳跃.
  • 低激活能量表明,由酸联体旋转促进的高效质子跳跃.

结论:

  • 协调网络可以表现出内在质子导电性.
  • 合成的材料显示出作为质子导体的潜力.
  • 了解结构特征的作用,如连接体旋转,是设计高效质子导体材料的关键.