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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.6K
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...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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...
460
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

341
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...
341
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
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
912
Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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通过可变的桥梁连接体策略访问双金属复合体.

Hansani T Lekam Wasam Liyanage1, Mark D Smith2, Kraig A Wheeler3

  • 1Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, Illinois, 61920, USA. rsemeniuc@eiu.edu.

Dalton transactions (Cambridge, England : 2003)
|November 26, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了用于合成异金属复合物的可变桥接联体 (VBL) 策略. 这种方法简化了从单一前体中创建多种金属体的过程,克服了以前方法的局限性.

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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科学领域:

  • 协调化学 协调化学
  • 无机合成 无机合成
  • 超分子化学 超分子化学

背景情况:

  • 合成异金属复合物往往需要为每一个新的金属聚合物重新设计连接物.
  • 需要一个灵活的策略来从一个共同的起始材料中产生多样化的金属体.

研究的目的:

  • 开发和演示一个可变桥接联体 (VBL) 战略,以实现高效的异金属复合合成.
  • 合成和表征新型铜 (II) 复合物和衍生金属合金体.
  • 使用VBL方法制备和表征混合价值铜 (II) /铜 (I) 复合物.

主要方法:

  • 合成了一种新的连接体, bis(pyrazol-1-yl) -N-(quinolin-8-yl) 乙胺 (HLQ2Pz).
  • 使用Cu(II) 和HLQ2Pz.制备前金属联体.
  • 金属连体的合成和随后的混合价值Cu (II) /Cu (I) 复合物的形成.
  • 通过NMR,UV-Vis,IR光谱和单晶X射线衍射进行表征.

主要成果:

  • 成功合成了前金属聚合物 (LQ2Pz) Cu ((OAc) ·H2O, (LQ2Pz) Cu ((BF4) 和 (LQ2Pz) Cu ((ClO4) ·MeCN.
  • 制备了两个不同的金属合物, (LQ2Pz) Cu[O2CCH(pz) ]和 (LQ2Pz) Cu[O2CCH(CH2pz) ],从一个单一的金属合物前体.
  • 合成了两种新的混合价值Cu (II) /Cu (I) 复合物:{(LQ2Pz) CuII[O2CCH (CH2pz) 2CuI (PPh3) 2) }NO3和{(LQ2Pz) CuII[O2CCH (CH2pz) 2) }2CuI (PF6).
  • 结构特征证实了合成复合物的形成和连接性.

结论:

  • 变性桥接联体 (VBL) 策略为各种异金属复合体提供了一条多功能途径.
  • 这种方法通过允许从常见的起始材料进行修改来简化金属体的合成.
  • 混合价值铜复合物的成功合成证明了VBL方法在构建复杂的多核系统中的实用性.