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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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Complexometric Titration: Ligands

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Valence Bond Theory

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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Dinuclear zinc complexes using pentadentate phenolate ligands.

Paul D Knight1, Andrew J P White, Charlotte K Williams

  • 1Department of Chemistry, Imperial College London, London, SW7 2AZ, UK.

Inorganic Chemistry
|December 5, 2008
PubMed
Summary
This summary is machine-generated.

This study reports 15 dinuclear zinc complexes, including X-ray structures, for catalysis. The synthesized ligands and complexes show potential as initiators for lactide ring-opening polymerization.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Polymer Chemistry

Background:

  • Dinuclear zinc complexes offer unique catalytic properties.
  • Ligand design is crucial for tuning metal center reactivity.
  • Ring-opening polymerization is a key method for biodegradable polymer synthesis.

Purpose of the Study:

  • To synthesize and characterize novel dinuclear zinc complexes.
  • To investigate the catalytic activity of these complexes in lactide polymerization.
  • To explore structure-activity relationships based on ligand variations.

Main Methods:

  • Synthesis of three related p-cresol-based ligands (L(1), L(2), L(3)).
  • Preparation of dizinc trihalide, dizinc ethoxide, dizinc triacetate, and cationic dizinc diacetate complexes.
  • X-ray crystallography for structural elucidation of five complexes.
  • In situ testing of dizinc ethoxide complexes as initiators for lactide ring-opening polymerization.

Main Results:

  • Fifteen dinuclear zinc complexes were synthesized and characterized.
  • X-ray crystal structures of five complexes were determined, revealing structural details.
  • Dizinc ethoxide complexes successfully initiated lactide ring-opening polymerization.
  • Structural differences among complexes with varying ligands were observed and discussed.

Conclusions:

  • The synthesized dinuclear zinc complexes are effective initiators for lactide polymerization.
  • Ligand structure significantly influences the properties and potential applications of the zinc complexes.
  • This work provides a foundation for developing new zinc-based catalysts for polymer synthesis.