(4-Phenylthiophenyl)diphenylsulfonium triflate
(4-Phenylthiophenyl)diphenylsulfonium triflate (CAS: 111281-12-0) is an organic compound with the formula C25H19F3O3S3 and a molecular weight of 520.61 g/mol. It functions as a highly effective cationic photoinitiator and photoacid generator. This chemical is primarily utilised in specialised applications within materials science, micro/nanoelectronics, and polymerisation processes, particularly where UV-curing or acid-catalysed reactions are required.
- IUPAC
- (4-Phenylthiophenyl)diphenylsulfonium trifluoromethanesulfonate

Cationic Photoinitiator
This compound serves as a potent photoinitiator for cationic polymerisation. Upon exposure to UV light (λmax 298 nm), it generates initiating species that drive the rapid curing of monomers and oligomers.
Photoacid Generator (PAG)
As a photoacid generator, it releases a strong acid upon irradiation. This property is crucial in photolithography for creating micro- and nanoelectronic devices and in advanced polymer synthesis.
Materials Science and Polymerisation
Its applications extend to various areas of polymer science, enabling controlled polymerisation and the development of novel materials with specific properties through UV-activated processes.
| Molecular weight | 520.61 |
|---|---|
| Empirical formula | C25H19F3O3S3 |
| Application | Cationic photoinitiator. Photoacid generator. |
| Melting point | 81-85 °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 298 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-Phenylthiophenyl)diphenylsulfonium triflate used for?
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This chemical is primarily used as a cationic photoinitiator and a photoacid generator (PAG) in applications such as UV curing, photolithography, and polymerisation processes within materials science and micro/nanoelectronics.
What is the CAS number and chemical formula?
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The CAS number is 111281-12-0 and the empirical formula (Hill notation) is C25H19F3O3S3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this chemical for research and laboratory use. The specific assay and purity are detailed in the product's Certificate of Analysis. We do not represent this product as meeting pharmacopoeia standards (e.g., USP, BP, EP) unless explicitly stated.
How should (4-Phenylthiophenyl)diphenylsulfonium triflate be handled?
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Handle with appropriate personal protective equipment, including a dust mask (N95 type), eyeshields, and gloves. Avoid breathing dust and ensure adequate ventilation. This compound may cause skin irritation, eye irritation, and respiratory tract irritation (H315, H319, H335).
Is this chemical suitable for self-assembly and contact printing?
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Yes, based on its applications in micro/nanoelectronics and materials science, it is relevant for processes like self-assembly and contact printing where photo-initiated reactions are employed.
How is this product packed and exported?
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Tech Serve Solutions carefully packs and exports fine chemicals globally, adhering to all relevant shipping regulations to ensure safe and timely delivery.
How can I request a sample or quote?
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Please contact our sales team directly via the website or by phone to request a sample or a formal quotation for (4-Phenylthiophenyl)diphenylsulfonium triflate.
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