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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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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.7K
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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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...
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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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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

4.1K
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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Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
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Zinc(II) Complexes with Dangling Functional Organic Groups.

Jingxia Yang1, Michael Puchberger1, Renzhe Qian2

  • 1Institute of Materials Chemistry, Vienna University of Technology 1060 Wien, Austria.

European Journal of Inorganic Chemistry
|June 6, 2014
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel zinc(II) complexes using functionalized benzene derivatives. The study details selective coordination behaviors and the formation of a 3D coordination polymer from p-aminobenzoic acid.

Keywords:
Carboxylate ligandsCoordination polymersSchiff basesZinc

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Zinc(II) complexes are versatile in catalysis and materials.
  • Functional organic groups offer tunable properties for coordination polymers.
  • Bifunctional ligands enable complex network formation.

Purpose of the Study:

  • Synthesize zinc(II) complexes with diverse functional groups.
  • Investigate the coordination behavior of bifunctional ligands with zinc(II).
  • Characterize the resulting coordination polymers, including their structure.

Main Methods:

  • Reaction of zinc acetate with various p-substituted benzene derivatives.
  • Utilizing ligands with carboxylate, oximate, amino, β-ketoimine, and salicylaldime groups.
  • Crystallization and structural analysis of the resulting coordination compounds.

Main Results:

  • Selective coordination to carboxylate groups observed with oxime and β-ketoimine functionalities.
  • Additional coordination by amine and salicylaldimine groups occurred.
  • A 3D coordination polymer, [Zn2(OOCCH3)(OOC-C6H4-NH2)3]∞, was formed using p-aminobenzoic acid.

Conclusions:

  • The nature of the second functional group dictates coordination mode in zinc(II) complexes.
  • Bifunctional ligands can lead to the formation of intricate coordination polymer architectures.
  • p-Aminobenzoic acid serves as a bridging ligand in a novel 3D zinc coordination polymer.