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Synthesis and Structural Characterization of a Dithiosilacarboxylate Dimer.

Shugo Tasaki¹, Koh Sugamata^1,2, Takahiro Sasamori^1,2

¹Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan.

Inorganic Chemistry

|April 19, 2026

Summary

Researchers synthesized a terphenyl-substituted lithium dithiosilacarboxylate dimer. This novel silicon-sulfur compound exhibits a stable cis-geometry in its core structure and remains intact in solution.

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Area of Science:

Organosilicon Chemistry
Coordination Chemistry
Materials Science

Background:

Dithiosilacarboxylates are an emerging class of silicon-sulfur compounds.
Understanding their structural and bonding properties is crucial for developing new materials.
Previous studies have explored related silicon-sulfur heterocycles.

Purpose of the Study:

To synthesize and characterize a novel terphenyl-substituted lithium dithiosilacarboxylate dimer.
To elucidate the molecular structure and solid-state geometry of the synthesized compound.
To investigate the stability and dissociation behavior of the dimer in solution.

Main Methods:

Synthesis via the reaction of aryltrifluorosilane with lithium (trimethylsilyl)thiolate.
Single-crystal X-ray diffraction for molecular structure determination.
Spectroscopic analyses (e.g., NMR, IR) to study solution behavior.

Main Results:

Successful synthesis of the terphenyl-substituted lithium dithiosilacarboxylate dimer.
X-ray diffraction confirmed a cis-geometry for the Si2S2 core in the crystalline state.
The dimer and its methyl ester derivative showed no homolytic dissociation in solution, even at elevated temperatures.

Conclusions:

The study presents a new silicon-sulfur dimer with a defined cis-Si2S2 core.
The compound exhibits significant stability in solution, resisting homolytic dissociation.
Findings contribute to the understanding of silicon-sulfur chemistry and potential applications.