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Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

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Sulfur Precursor Conversion Pathways in Phase Control of Cu_2-xS Nanocrystals.

Shaobo He¹, Jiakai Wu¹, Xinxin Zhang¹

¹School of Petrochemical Engineering & Environment, Zhejiang Ocean University, No. 1, Haida South Road, Lincheng Changzhi Island, Zhoushan 316022, China.

Inorganic Chemistry

|December 4, 2025

Summary

Controlling the phase of copper sulfide nanocrystals (NCs) is crucial. This study reveals how thiourea (TU) in oleylamine (OAm) forms specific sulfur species, dictating the final NC phase for advanced material applications.

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Area of Science:

Materials Science
Nanotechnology
Inorganic Chemistry

Background:

Phase control of copper sulfide (Cu2-xS) nanocrystals (NCs) is vital for applications.
Colloidal synthesis has explored various sulfur precursors, but conversion pathways remain unclear.
Understanding precursor conversion is key to tailoring NC properties.

Purpose of the Study:

To investigate the conversion pathways of thiourea (TU) in oleylamine (OAm).
To identify reactive sulfur species generated during TU pyrolysis.
To establish the link between these species and the resulting Cu2-xS NC phases.

Main Methods:

Colloidal synthesis of Cu2-xS NCs using TU as a sulfur precursor in OAm.
Analysis of pyrolysis intermediates and reactive sulfur species.
Phase characterization of synthesized Cu2-xS NCs.

Main Results:

Thiourea pyrolysis in OAm yields CS2, H2S, and N,N'-disubstituted TU.
H2S is linked to cubic-phase digenite (Cu1.8S) NCs.
N,N'-disubstituted TU is linked to hexagonal-phase djurleite (Cu1.94S) NCs.
These pathways were extended to synthesize Cu-In-S and Cu-Sn-S NCs with desired phases.

Conclusions:

The conversion pathways of sulfur precursors directly influence the phase of metal sulfide NCs.
Identifying reactive sulfur species provides control over NC polymorphism.
This approach offers a promising route for synthesizing phase-controlled metal sulfides.