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Related Concept Videos

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...
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...
Structural Isomerism02:34

Structural Isomerism

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 be...
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Complexometric Titration: Ligands00:43

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...

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Related Experiment Video

Updated: May 31, 2026

Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores
11:38

Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores

Published on: April 5, 2022

Antibacterial dimeric copper(II) complexes with chromone-derived compounds.

Zahid H Chohan1, Mohammad S Iqbal, Syed K Aftab

  • 1Department of Chemistry, Bahauddin Zakariya University, Multan, Pakistan. dr.zahidchohan@gmail.com

Journal of Enzyme Inhibition and Medicinal Chemistry
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

New chromone derivatives and their copper(II) complexes show enhanced antibacterial activity. Complexation significantly boosted the efficacy of these compounds against Gram-negative and Gram-positive bacteria.

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Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores
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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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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

Area of Science:

  • Medicinal Chemistry
  • Coordination Chemistry
  • Antimicrobial Agents

Background:

  • Chromone derivatives are known for diverse biological activities.
  • Copper complexes often exhibit enhanced pharmacological properties compared to their ligands.
  • Developing novel antimicrobial agents is crucial due to rising antibiotic resistance.

Purpose of the Study:

  • To synthesize and characterize novel chromone-derived ligands and their copper(II) complexes.
  • To evaluate the in vitro antibacterial potential of these synthesized compounds.
  • To investigate the effect of copper(II) complexation on the antibacterial activity of chromone derivatives.

Main Methods:

  • Synthesis of six chromone-derived ligands and their corresponding Cu(II) complexes.
  • Characterization using physical, spectral, and analytical techniques.
  • In vitro antibacterial activity screening using the agar-well diffusion method against standard bacterial strains (E. coli, P. aeruginosa, S. typhi, S. flexneri, B. subtilis, S. aureus).

Main Results:

  • Chromone ligands displayed low-to-moderate or no antibacterial activity.
  • The synthesized Cu(II) complexes exhibited moderate-to-high antibacterial activity.
  • Complexation with Cu(II) ions significantly enhanced the antibacterial efficacy, activating previously inactive ligands and potentiating less active ones.

Conclusions:

  • Copper(II) complexation is an effective strategy to enhance the antibacterial properties of chromone-derived compounds.
  • The synthesized Cu(II) complexes represent promising candidates for novel antibacterial agents.
  • Further research into the mechanism of action and in vivo efficacy is warranted.