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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: Apr 9, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Tunable Methylation in Imide-Linked Covalent Organic Frameworks Enables Highly Selective SF₆ Capture.

Jun Yan^1,2, Jiangli Zhu¹, Qilin Wang¹

¹School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, China.

Journal of the American Chemical Society

|April 8, 2026

Summary

Strategic methyl-group engineering in imide-linked covalent organic frameworks (COFs) enables efficient sulfur hexafluoride (SF₆) capture. This modification optimizes pore size and interactions for superior SF₆/N₂ separation.

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Last Updated: Apr 9, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

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Published on: October 18, 2019

Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Rational design of covalent organic frameworks (COFs) for energy-efficient sulfur hexafluoride (SF₆) capture is limited by a lack of mechanistic understanding regarding structure-property relationships.
Developing effective SF₆ capture materials is crucial due to its potent greenhouse gas properties.

Purpose of the Study:

To investigate the impact of methyl-group engineering in imide-linked COFs on SF₆ capture and separation performance.
To elucidate the structure-property relationships governing SF₆ adsorption in tailored COFs.

Main Methods:

Systematic methylation of triazine building units in imide-linked COFs.
Characterization of structural evolution from AA to ABC stacking modes.
Gas sorption analysis and breakthrough experiments for SF₆/N₂ separation.
Molecular simulations to understand adsorption mechanisms.

Main Results:

Methylation induced a stacking transition from AA to ABC, optimizing ultramicropore size (0.66 nm) for SF₆.
Dimethyl-functionalized NMUCOF-5 achieved high SF₆ uptake (42.5 cm³·g^-1) and selectivity (126) for SF₆/N₂.
Performance attributed to size-sieving and enhanced C-H···F interactions within methyl-enriched pores.

Conclusions:

Methyl-directed stacking modulation is an effective pore-engineering strategy for imide-linked COFs.
Substituent-controlled packing significantly influences SF₆ capture and separation efficiency.
This work provides mechanistic insights for designing advanced COFs for gas separation applications.