(4-Methoxyphenyl)diphenylsulfonium triflate
(4-Methoxyphenyl)diphenylsulfonium triflate (CAS: 116808-67-4), a sophisticated organic compound with the formula C20H17F3O4S2 and a molecular weight of 442.47 g/mol, functions primarily as a potent photoacid generator. Its applications span advanced materials science and microelectronics, where it is instrumental in photolithography and the development of photoresists. This triflate salt is a key reagent for initiating cationic polymerization and enabling precise patterning in high-technology manufacturing processes.
- IUPAC
- (4-Methoxyphenyl)diphenylsulfonium trifluoromethanesulfonate

Photoacid Generator (PAG)
This compound serves as a highly effective photoacid generator, releasing triflic acid upon UV irradiation. This acid catalyses various chemical reactions, particularly in photolithography and the curing of coatings and inks.
Cationic Photoinitiator
As a cationic photoinitiator, it is employed in UV-curable formulations. Upon light exposure, it generates cations that initiate the polymerization of monomers such as epoxides and vinyl ethers, leading to rapid material solidification.
Materials Science and Microelectronics
Its properties make it valuable in advanced materials development and micro/nanoelectronics. It is used in the formulation of photoresists for microchip fabrication and other high-resolution patterning applications.
Polymer Science
The compound is a key reagent for initiating and controlling polymerization processes. It finds utility in creating polymers with specific architectures and properties, particularly in areas requiring photo-initiated chain growth.
| Molecular weight | 442.47 |
|---|---|
| Empirical formula | C20H17F3O4S2 |
| Application | Cationic photoinitiator. Photoacid generator. |
| Melting point | 101-104 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Absorption | λmax 260 nm |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is (4-Methoxyphenyl)diphenylsulfonium triflate used for?
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This compound is primarily used as a photoacid generator (PAG) and a cationic photoinitiator. It is crucial in photolithography, the formulation of photoresists for microelectronics, and in initiating cationic polymerization in polymer science and advanced materials.
What is the CAS number and formula for (4-Methoxyphenyl)diphenylsulfonium triflate?
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The CAS number is 116808-67-4, and the empirical formula (Hill notation) is C20H17F3O4S2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies (4-Methoxyphenyl)diphenylsulfonium triflate typically as a research or technical grade material. We do not represent this product as USP, BP, EP, or for pharmaceutical use unless explicitly stated otherwise in the product specifications.
What are the safety and handling considerations for this chemical?
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This compound is classified as a Warning, with hazards including skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). It is recommended to use a dust mask (N95), safety eyeshields, and gloves, and to avoid breathing dust. Ensure good ventilation in the working area.
How is (4-Methoxyphenyl)diphenylsulfonium triflate packed, shipped, and exported?
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Tech Serve Solutions expertly packs and ships chemicals globally. Standard packaging is used to ensure product integrity and compliance with international shipping regulations for hazardous materials. We are experienced exporters serving research institutions and industrial clients worldwide.
How can I request a sample or quote for this product?
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To request a sample or obtain a quotation, please visit the Tech Serve Solutions website and use the dedicated 'Request a Quote' or 'Sample Request' forms, referencing the product name and CAS number (116808-67-4).
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