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相关概念视频

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.1K
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...
1.1K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

761
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...
761
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.8K
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...
23.8K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.0K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.4K
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...
30.4K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.9K
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,...
47.9K

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相关实验视频

Updated: Jan 6, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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通过竞争和合作途径在固态宏循环宿主-客系统中进行链长选择性分子间电荷转移调节.

Susu Ren1, Yu-Xiang Sun1, Yuan-Zheng Liu1

  • 1Key Laboratory of Automobile Materials, MOE, Department of Materials Science, School of Materials Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
|November 20, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用宏循环和电荷转移复合体开发了动态的超分子材料. 这些材料表现出可调节的光学和光热特性,以应对化物蒸气,使新的功能材料设计成为可能.

关键词:
收费转移 - 转移收费共同的晶体是共同的晶体.主机客户端系统.宏观循环是一个宏观循环.具有蒸汽反应的材料.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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科学领域:

  • 超分子化学 超分子化学
  • 材料科学 材料科学 材料科学
  • 有机电子 有机电子

背景情况:

  • 对于响应性材料来说,固体中分子间电荷转移 (CT) 相互作用的动态调节至关重要.
  • 开发具有可调节光学和光热性能的固态材料仍然是一个挑战.

研究的目的:

  • 设计基于宏循环的动态CT复合体,具有可调节的光学和光热性能.
  • 研究响应性材料构建的双模超分子策略.
  • 探索蒸汽诱导的结构转变及其对材料性质的影响.

主要方法:

  • 用F4TCNQ无溶剂研磨来自pilararene的宏循环 (EtLP6,EtFLP6) 以形成CT复合体.
  • 使用亚利法性化物蒸气的蒸气色学研究.
  • 单晶X射线衍射和粉末衍射分析.
  • 用光谱分析 (UV-Vis-NIR) 来监测结构变化.
  • 在808nm辐射下测量光热转换效率.

主要成果:

  • 形成无序的CT组件,具有可调节的链长度依赖的蒸发色行为.
  • 独特的蒸汽反应机制:客人触发的拆卸/重新组装 (EtLP6-F4TCNQα) 和基辅助的三元组装 (EtFLP6-F4TCNQα).
  • 蒸汽诱导的结构变化与近红外 (NIR) 吸收变化之间的相关性.
  • 展示了第一个蒸汽调节的有机光热共晶系统,可调节的转换效率高达11%.

结论:

  • 建立了一个多功能框架,用于设计具有多响应光学和热功能的固态超分子材料.
  • 宏循环宿主-客化学为动态CT复杂结构提供了强大的工具.
  • 开发的材料显示出在传感和光热疗法中的应用潜力.