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Formation of Complex Ions

Formation of Complex Ions

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...

Extraction: Advanced Methods

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...

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...

Precipitation of Ions

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

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Related Experiment Video

Updated: Jan 17, 2026

A Method to Fabricate Disconnected Silver Nanostructures in 3D

A Method to Fabricate Disconnected Silver Nanostructures in 3D

Published on: November 27, 2012

One-Step Silver Leaching from Manganese-Silver Ore Enabled by Hydrogen-Bonded Network Formation.

Zhiyuan Zeng¹, Bin Li¹, Yuntao Zheng¹

¹Institute of Nuclear and New Energy Technology, Tsinghua University, Haidian District, Beijing, 100084, China.

Angewandte Chemie (International Ed. in English)

|September 16, 2025

Summary

This summary is machine-generated.

This study introduces a green, non-toxic silver leaching method using oxalic acid and quaternary ammonium salts. It efficiently recovers silver from ores by utilizing hydrogen bonds to break down mineral structures, offering a sustainable alternative to cyanidation.

Keywords:

H‐bond‐directed metallurgy Inorganic helical chain Quaternary ammonium salt Selective leaching Silver

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Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold

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Published on: February 10, 2023

Area of Science:

Green Chemistry
Materials Science
Metallurgy

Background:

Silver scarcity necessitates sustainable extraction methods for low-grade ores.
Conventional cyanidation poses significant toxicity and environmental risks, limiting its sustainability.
Developing eco-friendly leaching systems is crucial for modern silver metallurgy.

Purpose of the Study:

To develop a novel, non-toxic, and efficient silver leaching system for polymetallic manganese-silver ores.
To investigate the mechanism of silver leaching using a synergistic system of oxalic acid and cyano-functionalized quaternary ammonium salts.
To demonstrate a sustainable alternative to traditional cyanidation methods.

Main Methods:

A one-step leaching process utilizing oxalic acid and cyano-functionalized branched quaternary ammonium salts.
Kinetic studies to analyze the two-stage leaching process.
Spectroscopic characterization and theoretical calculations to elucidate the silver chloride complexation and helical structure formation.

Main Results:

Achieved over 90% silver recovery from polymetallic manganese-silver ore under mild conditions.
Identified a two-stage leaching mechanism involving manganese oxide dissolution and iron matrix breakdown.
Discovered a unique inorganic helical chain structure formed by AgCl and chloride anions, stabilized by hydrogen bonds, which facilitates silver dissolution.

Conclusions:

The developed leaching system offers an efficient, selective, and sustainable method for silver extraction.
The cooperative effect of hydrogen bonds in stabilizing helical structures provides a new mechanism for overcoming high lattice energies in solids.
This research presents a novel H-bond-directed design strategy for sustainable metallurgical processes.