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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.9K
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...
20.9K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

399
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...
399
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

549
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...
549
Stereoisomerism02:52

Stereoisomerism

12.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
12.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

989
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...
989
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

616
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
616

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Updated: Jul 17, 2025

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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光学活性双 ((氨基) 和它们的金属复合物.

Halen Carbonel1, Timothy D Mikulski1, Kahargyan Nugraha1

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA. Seth.N.Brown.114@nd.edu.

Dalton transactions (Cambridge, England : 2003)
|September 5, 2023
PubMed
概括

合成了光学活跃的性联结体,并用于创建新的,和复合体. 这些复合体具有独特的结构和电子特性,通过光谱和计算分析证实了这一点.

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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
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科学领域:

  • 协调化学 协调化学
  • 有机金属化学 有机金属化学
  • 基质连接体合成 基质连接体合成

背景情况:

  • 开发光学活性联体对于不对称催化和材料科学至关重要.
  • 双氨) 连接物为金属复合体提供了多功能协调环境.
  • 了解金属复合物的立体化学是预测其属性的关键.

研究的目的:

  • 为了合成新的光学活性 bis(aminophenol) 配体: (R)-2,2'-diaminobinaphthyl (BiniqH4) 和 (R,R)-2,3-butanediyldianthranilate (BdanH4) 的新型光学活性配体.
  • 准备和表征10组金属复合物 (Pd,Pt) 和氧复合物,使用这些性联体.
  • 研究由此产生的金属复合物的结构,立体化学和电子特性.

主要方法:

  • 通过凝结反应合成联结体.
  • 氧化性化以形成二氧化 (?? 胺半) 金属复合体.
  • 电子结构分析的光谱技术 (循环二重化,光学光谱) 和TDDFT计算.

主要成果:

  • 成功合成了奇拉双氨基醇配体及其相应的Pd,Pt和Os复合体.
  • 基于连接体结构 (例如,C2轴方向) 的不同协调模式和立体化学的演示.
  • 电子结构与观察到的圆形二极化谱的相关性,得到理论计算的支持.

结论:

  • 合成的性联结体使结构多样化和立体化学定义的金属复合物的形成成为可能.
  • 这项研究提供了关于联结体性,金属协调和复杂电子性质之间的关系的见解.
  • 这些发现有助于设计新的性有机金属化合物,用于潜在的应用.