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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.7K
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...
20.7K
Formation of Complex Ions03:45

Formation of Complex Ions

23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.3K
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...
26.3K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

353
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
353
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.9K
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,...
41.9K

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相关实验视频

Updated: Jun 18, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

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模拟金属 - 伊米达复合物

Zhen Li1, Subhamoy Bhowmik1, Luca Sagresti2,3

  • 1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States.

Journal of chemical theory and computation
|July 31, 2024
PubMed
概括
此摘要是机器生成的。

这项研究开发了新的计算参数来建模金属离子相互作用与蛋白质中的多个histidine残留物. 改进的模型准确地预测了结合能量和几何形状,这对于理解金属蛋白功能至关重要.

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Synthesis of a Water-soluble Metal–Organic Complex Array
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Synthesis of a Water-soluble Metal–Organic Complex Array
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科学领域:

  • 生物化学 生物化学
  • 计算化学计算化学
  • 结构生物学 结构生物学

背景情况:

  • 金属蛋白质利用希斯蒂丁伊米达侧链进行金属离子结合.
  • 现有的伊米达-金属相互作用的计算模型对多重连接体有局限性.
  • 对这些相互作用的准确建模对于理解蛋白质功能至关重要.

研究的目的:

  • 开发和验证新的计算参数,用于模拟多个伊米达 - 金属离子复合体.
  • 为了提高预测金属蛋白中结合自由能量和几何形状的准确性.
  • 为了研究连接体-连接体相互作用和金属-π堆叠的影响.

主要方法:

  • 对五种金属离子 (Co ((II),Cu ((II),Mn ((II),Ni ((II),Zn ((II)) 的多个伊米达复合物 (1-6 伊米达) 的系统模拟.
  • 使用OPC水和AMBER HID imidazole模型进行了广泛的自由能源协会概况计算.
  • 模拟结果与实验结合自由能量和DFT计算进行比较.
  • 通过金属-伊米达复合物的闭合热力学循环进行验证.

主要成果:

  • 开发了一组新的imidazole-M(II) 相互作用参数,改进了能量和几何预测.
  • 获得的自由能量概况与实验约束数据和DFT计算相一致.
  • 通过关闭热力学循环,成功验证了多达六个 imidazoles 的复合体的模型.
  • 产生了6个额外的金属离子 (Ag(I),Ca(II),Cd(II),Cu(I),Fe(II),Mg(II) 的新参数.

结论:

  • 新的参数提高了金属蛋白模拟计算模型的准确性.
  • 该研究强调了连接体-连接体相互作用和金属-π-堆叠在金属-蛋白质结合中的重要性.
  • 这项工作为未来对金属蛋白结构功能关系的研究提供了宝贵的工具.