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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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...
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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...
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.8K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.8K
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...
19.1K
Stereoisomerism02:52

Stereoisomerism

11.8K
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...
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Recent progress in transition metal complexes featuring silylene as ligands.

Zohreh Hendi1, Madhusudan K Pandey1, Saroj Kumar Kushvaha1

  • 1Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Göttingen, 37077, Germany. hroesky@gwdg.de.

Chemical Communications (Cambridge, England)
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Stable silylenes are now key building blocks in chemistry, enabling new ways to stabilize elements and create catalysts. This review highlights recent advances in synthesizing and using these transition metal complexes for catalysis.

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Area of Science:

  • Organosilicon Chemistry
  • Main-Group Chemistry
  • Coordination Chemistry

Background:

  • Silylenes, divalent silicon(II) compounds, were once transient but are now stable synthons.
  • Stable silylenes are crucial for stabilizing low-valent main-group elements and act as ligands.
  • Transition metal complexes with silylene ligands are gaining research interest due to their properties.

Purpose of the Study:

  • To review recent progress in the synthesis of transition metal-silylene complexes.
  • To highlight the catalytic applications of these novel complexes.

Main Methods:

  • Focus on synthetic strategies for stable silylenes.
  • Exploration of silylenes as ligands in coordination chemistry.
  • Investigation of catalytic activities of metal-silylene complexes.

Main Results:

  • Silylenes are versatile ligands with strong sigma-donor properties.
  • These complexes effectively stabilize low-valent transition metals.
  • Demonstrated catalytic efficacy in hydroboration, hydrosilylation, hydrogenation, and small molecule activation.

Conclusions:

  • Transition metal-silylene complexes represent a significant advancement in catalysis.
  • Continued research promises further development in synthetic and catalytic applications.
  • Silylene chemistry offers a powerful platform for innovation in main-group and organometallic chemistry.