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Related Concept Videos

Crown Ethers02:36

Crown Ethers

5.1K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.2K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

1.7K
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...
1.7K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.0K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

418
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...
418
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

526
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Facially amphiphilic skeleton-derived antibacterial crown ether/silver ion complexes.

Qingsheng Wang1, Wen Huang2, Qian Sun2

  • 1Orthopedics Department, General Hospital of Pingmei Shenma Group, Pingdingshan 467000, China.

Soft Matter
|February 24, 2025
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Summary

A novel D-CA6-CE/Ag+ complex shows strong antibacterial activity against common pathogens. This silver-based material offers enhanced efficacy and reduced toxicity compared to silver sulfadiazine for treating bacterial infections.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Medicinal Chemistry

Background:

  • Silver compounds are known for antibacterial properties but are limited by biological toxicity.
  • Developing safer and more effective silver-based antimicrobials is crucial for treating bacterial infections.

Purpose of the Study:

  • To design and synthesize a novel facially amphiphilic skeleton-derived silver complex (D-CA6-CE/Ag+).
  • To evaluate the antibacterial activity and biological toxicity of the novel complex compared to silver sulfadiazine.

Main Methods:

  • Synthesis of a dendrimer D-CA6-CE incorporating crown ether moieties for silver ion chelation.
  • Characterization of the self-assembly of D-CA6-CE/Ag+ into nano-micelles in aqueous solution.
  • Determination of minimum inhibitory concentrations (MICs) against *Escherichia coli* and *Staphylococcus aureus*.
  • Assessment of hemolysis and cytotoxicity to evaluate biological safety.

Main Results:

  • D-CA6-CE/Ag+ self-assembles into nano-micelles, significantly reducing silver ion MICs to 6.13 μg mL-1 (*E. coli*) and 7.33 μg mL-1 (*S. aureus*).
  • The complex demonstrated superior antibacterial efficacy compared to silver sulfadiazine, attributed to enhanced bacterial membrane disruption.
  • D-CA6-CE/Ag+ exhibited significantly lower hemolysis and cytotoxicity, likely due to its micellar structure minimizing direct cell contact.

Conclusions:

  • The facially amphiphilic D-CA6-CE/Ag+ complex presents enhanced antibacterial performance and reduced biological toxicity.
  • This novel silver complex holds promise as a potential therapeutic agent for bacterial infections.