Triphenylsulfonium chloride
[CAS# 4270-70-6]

Identification

• Classification: Organic raw materials >> Aryl compounds
• Name: Triphenylsulfonium chloride
• Molecular Formula: C₁₈H₁₅ClS
• Molecular Weight: 298.83
• CAS Registry Number: 4270-70-6
• EC Number: 224-259-6
• SMILES: C1=CC=C(C=C1)[S+](C2=CC=CC=C2)C3=CC=CC=C3.[Cl-]

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H315-H319-H335
• Safety Statements: P261-P264-P264+P265-P271-P280-P302+P352-P304+P340-P305+P351+P338-P319-P321-P332+P317-P337+P317-P362+P364-P403+P233-P405-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335

Discovery and Applications

Triphenylsulfonium chloride is a chemical compound widely recognized for its utility in the field of organic chemistry, particularly in photochemistry and as a photoinitiator in polymerization processes. This compound, denoted as Ph₃SCl, features a sulfonium ion where three phenyl groups are attached to a sulfur atom, with a chloride ion as the counterion.

The discovery of triphenylsulfonium chloride dates back to the mid-20th century, with its synthesis involving the reaction of triphenylsulfonium salts with various halogenating agents. The introduction of triphenylsulfonium chloride into the chemical literature provided a new tool for researchers exploring photochemical reactions and polymerization techniques. Its distinctive structure, featuring a sulfonium center surrounded by phenyl groups, imparts unique properties to the compound that are valuable in various chemical processes.

In practical applications, triphenylsulfonium chloride is primarily used as a photoinitiator in polymer chemistry. Photoinitiators are substances that initiate polymerization reactions upon exposure to light. Triphenylsulfonium chloride, upon irradiation with ultraviolet (UV) light, generates reactive species that can start the polymerization of monomers, leading to the formation of polymers. This property is particularly useful in the production of photoresists and coatings, where precise control over the polymerization process is required.

Additionally, triphenylsulfonium chloride finds application in the field of photochemistry as a reagent for generating sulfur-based radicals. These radicals can participate in various chemical reactions, making triphenylsulfonium chloride a valuable compound for studying reaction mechanisms and developing new synthetic pathways. The compound's ability to generate reactive intermediates under UV light conditions is exploited in the synthesis of complex organic molecules and materials.

Another notable application of triphenylsulfonium chloride is in the production of advanced materials such as electronic and optical devices. Its role as a photoinitiator is crucial in the development of materials with specific properties, including those used in high-resolution printing and microfabrication technologies.

Overall, triphenylsulfonium chloride has established itself as an important compound in both academic research and industrial applications. Its unique properties as a photoinitiator and radical generator make it a versatile tool in the synthesis of organic compounds and materials, contributing to advancements in various fields of chemistry and materials science.

References

2014. Synthesis of Triphenylsulfonium Triflate Bound Copolymer for Electron Beam Lithography. Journal of Nanoscience and Nanotechnology, 14(8).
DOI: 10.1166/jnn.2014.8826

2011. Photoacid generator formation for the selective enrichment of perfluoroalkyl sulfonates and their direct analysis by MALDI-TOF-MS. The Analyst, 136(11).
DOI: 10.1039/c0an01037e

2005. Patterning of Single-Wall Carbon Nanotubes via a Combined Technique (Chemical Anchoring and Photolithography) on Patterned Substrates. The Journal of Physical Chemistry. B, 109(18).
DOI: 10.1021/jp0508103