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Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: Jun 22, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Published on: February 15, 2016

Zwitterionic Thiolate-Protected Ag₂₂(0/I) and Ag₂₀(I) Clusters: Assembly, Structural Characterization, and

Xin-Yao Wang^1,2, Wei Meng³, Hong-Ping Xie¹

¹College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China.

Inorganic Chemistry

|June 29, 2024

Summary

This study reports the first synthesis of silver(0/I) clusters using zwitterionic thiolate ligands, revealing novel structures and enhanced antibacterial properties for advanced materials.

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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

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:

Inorganic Chemistry
Materials Science
Nanotechnology

Background:

Zwitterionic thiolate ligands offer unique assembly possibilities for noble metal clusters.
The synthesis and properties of silver clusters, especially those with Ag(0) species, are not well-explored.
Zwitterionic ligands like 4-(trimethylammonio)benzenethiolate (Tab) present an opportunity to stabilize novel silver cluster structures.

Purpose of the Study:

To synthesize and characterize novel silver clusters stabilized by zwitterionic Tab ligands.
To investigate the structural features and electronic properties of the synthesized silver clusters.
To evaluate the antibacterial activity of the novel silver clusters.

Main Methods:

Synthesis of mixed-valence silver(0/I) and silver(I) clusters using zwitterionic Tab ligands.
Structural characterization using X-ray crystallography and high-resolution electrospray ionization mass spectrometry.
Evaluation of antibacterial activity through minimum inhibitory concentration (MIC) assays.

Main Results:

Successful synthesis of a mixed-valence silver(0/I) cluster [Ag22(Tab)24] and an Ag(I) cluster [Ag20(Tab)12(PhCOO)10].
The Ag(0/I) cluster exhibits a unique supratetrahedral structure with a superatomic core, confirmed by mass spectrometry.
The synthesized Ag(0/I) cluster demonstrates significantly enhanced antibacterial activity compared to the Ag(I) cluster.

Conclusions:

Zwitterionic thiolate ligands can effectively stabilize silver(0/I) clusters with novel structures.
The synthesized silver clusters possess unique electronic and structural properties.
The findings offer potential for developing new antibacterial materials based on silver clusters.