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相关概念视频

Valence Bond Theory02:42

Valence Bond Theory

11.1K
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...
11.1K
Colors and Magnetism03:02

Colors and Magnetism

13.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.9K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

3.2K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
3.2K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.2K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.5K
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...
30.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.0K
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,...
48.0K

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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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在Digold中的Haptotropic现象 ((I) 三重结合复合体.

Ignacio Nieto-Vargas1, Juan Cayuela-Castillo1, Francisco J Fernández-de-Córdova1

  • 1Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINQA), CSIC and Universidad de Sevilla, 41092 Sevilla, Spain.

Inorganic chemistry
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概括
此摘要是机器生成的。

三金属金和铜复合体与乙化物联体显示不同的动态行为. 黄金复合体表现出动态的西格玛,pi交换,而铜复合体保持静态,提供了对金属-联结体相互作用的见解.

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科学领域:

  • 有机金属化学 有机金属化学
  • 协调化学 协调化学
  • 超分子化学 超分子化学

背景情况:

  • 黄金和铜复合物与乙化物联体具有独特的电子和结构性质,因此有趣.
  • 了解这些复合物的动态行为对于设计新材料和催化剂至关重要.

研究的目的:

  • 合成和表征新型三金属化金和铜乙化物复合物.
  • 通过使用可变温度的NMR光谱来研究溶液中这些复合物的动态行为.
  • 探索金属身份 (黄金与铜) 对复杂流动性的影响.

主要方法:

  • 三金属金和铜乙化物复合物的合成.
  • 可变温度1HNMR光谱 (VT-NMR) 用于研究动态过程.
  • 计算研究 (DFT) 以阐明反应机制和电子结构.

主要成果:

  • 三金属酸性物种的选择性形成 [IPrAuCC(π-MIPr) AuIPr][OTf] (M = Au 或 Cu).
  • 同三金属黄金复合体表现出动态的σ,π交换,即使在-130°C.
  • 异金属黄金-铜模拟显示了一个静态的场景.
  • 乙化物桥的延伸引入了π,π交换,在铜复合体中快速发生,在金复合体中被热捕获.
  • 计算研究表明过渡状态几何学的差异解释了不同的行为.

结论:

  • 这项研究揭示了同金属金和异金属金-铜乙化物复合体之间的独特动态行为.
  • 金属身份显著影响了这些三金属系统中的流动过程 (σ,π交换和π,π交换).
  • 计算洞察力突出了过渡状态几何学在管理动态行为中观察到的差异中的作用.