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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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Updated: May 7, 2025

Production of Synthetic Nuclear Melt Glass

Production of Synthetic Nuclear Melt Glass

Published on: January 4, 2016

Sulfur chains glass formed by fast compression.

Kaiyuan Shi^1,2, Xiao Dong³, Zhisheng Zhao⁴

¹Key Laboratory of Photochemistry, Institute of Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, China.

Nature Communications

|January 3, 2025

Summary

Elemental sulfur rapidly compressed forms a unique glassy polymeric chain state (Am-S_P), distinct from its usual S₈ phase. This fast compression technique offers new avenues for high-pressure synthesis and studying sulfur

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Last Updated: May 7, 2025

Production of Synthetic Nuclear Melt Glass

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Published on: January 4, 2016

Optimized Sealing Process and Real-Time Monitoring of Glass-to-Metal Seal Structures

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Published on: May 20, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Solid State Chemistry

Background:

Elemental sulfur exhibits exceptional allotrope and polymorph diversity due to its atoms' propensity for forming diverse molecular and polymeric structures.
Sulfur's phase diagram is complex, transitioning between insulating, semiconducting, and metallic states under varying pressure and temperature conditions.

Purpose of the Study:

To investigate the structural transformations of liquid sulfur under rapid compression.
To explore the potential of fast compression as a method for synthesizing novel sulfur phases and studying their properties.

Main Methods:

Utilized a fast compression technique to rapidly pressurize liquid sulfur.
Analyzed the resulting structural state of the compressed sulfur.

Main Results:

Demonstrated that rapid pressurization effectively breaks sulfur's molecular ring structure, yielding a glassy polymeric state composed of pure-chain molecules (Am-S_P).
This disordered chain state (Am-S_P) is found to be metastable in a pressure-temperature region typically associated with the S₈ molecular ring phase (Phase I).
The fast compression technique acts similarly to thermal quenching, irrespective of temperature.

Conclusions:

The creation of elemental sulfur glass (Am-S_P) provides a novel platform for investigating structure-property relationships in various sulfur phases.
Fast compression offers a versatile and rapid method for high-pressure synthesis, enabling control over fundamental thermodynamic parameters and potentially creating new materials.