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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: 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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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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Structural Isomerism02:34

Structural Isomerism

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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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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...
2.5K
Valence Bond Theory02:42

Valence Bond Theory

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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...
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A Stable Monomeric SiO2 Complex with Donor-Acceptor Ligands.

Ricardo Rodriguez1,2, David Gau1, Jérémy Saouli1

  • 1Université de Toulouse, UPS, and CNRS, LHFA UMR 5069, 31062, Toulouse, France.

Angewandte Chemie (International Ed. in English)
|March 2, 2017
PubMed
Summary

Researchers isolated a stable, monomeric silicon dioxide (SiO2) compound as a donor-acceptor complex. This novel SiO2 reagent is soluble, stable, and reactive, offering new possibilities in chemical synthesis.

Keywords:
SiO2 complexessilanonesiliconsilicon dioxide

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Area of Science:

  • * Inorganic Chemistry
  • * Organosilicon Chemistry
  • * Materials Science

Background:

  • * Monomeric silicon dioxide (SiO2) is challenging to isolate due to its high reactivity.
  • * Existing methods often yield polymeric or unstable SiO2 species.
  • * Development of stable, well-defined SiO2 compounds is crucial for understanding its fundamental chemistry and applications.

Purpose of the Study:

  • * To isolate and characterize a monomeric SiO2 compound.
  • * To create a stable donor-acceptor complex of SiO2.
  • * To evaluate the stability, solubility, and reactivity of the novel SiO2 complex as a potential reagent.

Main Methods:

  • * Synthesis of a silicon dioxide compound through complexation with specific ligands.
  • * Characterization using spectroscopic techniques (e.g., NMR, IR).
  • * Stability studies in solution and solid state at room temperature.
  • * Reactivity assessment for potential applications as a reagent.

Main Results:

  • * Successful isolation of a monomeric SiO2 compound, designated as 3.
  • * Compound 3 formed a stable donor-acceptor complex with both sigma-donating and donor-acceptor ligands.
  • * The SiO2 complex 3 demonstrated solubility in common organic solvents.
  • * The compound exhibited stability at room temperature in both solution and solid states.
  • * Compound 3 remained reactive, indicating its potential as a unimolecular reagent.

Conclusions:

  • * A stable, monomeric silicon dioxide (SiO2) complex has been successfully synthesized and isolated.
  • * The novel SiO2 compound serves as a soluble and room-temperature stable unimolecular reagent.
  • * This breakthrough provides a new platform for utilizing SiO2 in various chemical transformations.