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Synthesis and Characterization of Amphiphilic Gold Nanoparticles

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Published on: July 2, 2019

Gold oxidative dissolution by (thioamide)-I2 adducts.

Francesco Isaia¹, M Carla Aragoni, Massimiliano Arca

¹Dipartimento di Scienze Chimiche e Geologiche Università degli Studi di Cagliari, S.S. 554 bivio per Sestu, I-09042 Cagliari, Italy. isaia@unica.it

Dalton Transactions (Cambridge, England : 2003)

|October 20, 2012

Summary

Thioamide-iodine adducts efficiently oxidize elemental gold under mild conditions, forming novel ionic complexes. This offers a potential eco-friendly alternative for gold recovery from secondary sources.

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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Published on: September 12, 2018

Area of Science:

Inorganic Chemistry
Materials Science
Green Chemistry

Background:

Elemental gold oxidation is crucial for its recovery and utilization.
Traditional hydrometallurgical methods often involve harsh conditions and environmental concerns.

Purpose of the Study:

To investigate the efficacy of thioamide-iodine adducts as oxidising agents for elemental gold.
To explore the formation and structural characterization of novel gold complexes.
To evaluate the potential of this method for gold recovery from secondary sources.

Main Methods:

Reaction of elemental gold powder with 1:1 iodine adducts of 3-methyl-benzothiazole-2-thione (mbtt) and 1-methyl-1H-benzimidazole-2(3H)-thione (mbit).
Separation and characterization of ionic gold complexes using X-ray crystallography.
Analysis of the electronic structure and bonding in the complexes.

Main Results:

Successful oxidation of elemental gold with yields over 78% (for [Au(I)(mbtt)2]I3) and 45% (for [(mtbiH)2](AuI4))I3).
X-ray structures revealed linear Au(I) and square-planar Au(III) coordination geometries.
The S-donor to I2 interaction in the adducts facilitates charge separation and oxidation.

Conclusions:

Thioamide-iodine adducts are effective oxidising agents for gold under mild, non-aqueous conditions.
The study presents a promising alternative to hydrometallurgical processes for gold recovery.
This method offers potential for more sustainable gold recycling from secondary materials.