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相关概念视频

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
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
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
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,...
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...

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相关实验视频

Updated: May 16, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

解读阴离子团中的化学键的解读.

Fei Wang1, Ulrich Wedig, Dasari L V K Prasad

  • 1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany.

Journal of the American Chemical Society
|November 16, 2012
PubMed
概括

通常被认为是缺电子的团离子,实际上是电子和的. 这项研究揭示了Jahn-Teller效应和旋转轨道合解释了它们的结合,解决了化学结合理论中长期存在的差异.

科学领域:

  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学
  • 计算化学计算化学

背景情况:

  • 团离子表现出不寻常的化学结合,挑战了像韦德-明戈斯和津特尔-克莱姆概念这样的既定规则.
  • 这些星系团在历史上被误认为是星系团.
  • 低电子式的低电子式
  • 由于缺少足够的价值电子来进行骨结合.

研究的目的:

  • 为了提供一个一致的描述的化学键在聚阳离子.
  • 确定负责这些集群电子和的机制.
  • 为了使理论预测与实验观测相协调.

主要方法:

  • 在延伸固体上进行完全相对论带结构计算.
  • 在几何优化,电荷补偿集群上进行电子结构计算.
  • 电子状态退化的组理论分析.

主要成果:

  • 确定了Jahn-Teller效应和相对论旋转轨道合作为关键机制.
  • 证明了这些机制解除了退化,并打开了HOMO-LUMO差距.
  • 确认的团离子是电子和的,而不是低电子的.

更多相关视频

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

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

相关实验视频

Last Updated: May 16, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

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

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

结论:

  • 雅恩-泰勒效应和旋转轨道合提供了对聚离子键的一致解释.
  • 对电子结构的重新评估显示,在价值电子中和,而不是缺乏.
  • 开发了用于分析这些系统中边界轨道退行性的群理论程序.