4-Mercaptopyridine
4-Mercaptopyridine (CAS: 4556-23-4, Formula: C5H5NS) is a heterocyclic organic compound with a molecular weight of 111.16 g/mol. Supplied by Tech Serve Solutions with an assay of 95%, this chemical serves as a valuable building block in organic synthesis. Its primary documented application involves its use as a probe molecule in research settings, notably in studies concerning the performance of material composites like gold nanorod/polycaprolactone fibrous meshes.
- IUPAC
- 4-Pyridinethiol
- Synonyms
- 4-Pyridinethiol

Research Probe Molecule
4-Mercaptopyridine has been utilised as a probe molecule to investigate the performance characteristics of advanced material composites. This includes studies on fibrous meshes incorporating elements like gold nanorods and polycaprolactone.
Heterocyclic Synthesis
As a pyridine derivative containing a thiol group, 4-Mercaptopyridine functions as a versatile building block in the synthesis of more complex heterocyclic compounds. Its structure allows for various chemical transformations.
Chemical Synthesis Intermediate
This compound is employed as an intermediate in chemical synthesis pathways. It can be used to introduce the 4-pyridylthio moiety into target molecules within research and development laboratories.
| Molecular weight | 111.16 |
|---|---|
| Empirical formula | C5H5NS |
| Assay | 95% |
| Storage temperature | 2-8°C |
| Application | 4-Mercaptopyridine was used as a probe molecule to study the performance of the gold nanorod (AuNR)/polycaprolactone (PCL) fibrous mesh1. |

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) | 26-37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
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-Mercaptopyridine primarily used for?
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4-Mercaptopyridine is primarily used as a probe molecule in material science research and as a building block in organic chemical synthesis, particularly for creating complex heterocyclic structures.
What are the CAS number and molecular formula for 4-Mercaptopyridine?
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The CAS number for 4-Mercaptopyridine is 4556-23-4, and its molecular formula is C5H5NS.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Mercaptopyridine with a minimum assay of 95%. TSS does not represent this product as meeting any pharmacopoeia standards such as USP, BP, or EP.
What are the main safety hazards associated with 4-Mercaptopyridine?
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4-Mercaptopyridine is classified as a warning substance. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields, gloves, and a dust mask (type N95 US), should be used.
How is 4-Mercaptopyridine packed and shipped?
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This chemical is stored at 2-8°C. Details regarding specific packing for export are available upon request. Please contact our sales team for bulk or specific packaging requirements.
How can I request a quote or sample?
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To request a quote or a sample of 4-Mercaptopyridine, please contact the Tech Serve Solutions sales department through our website or by calling our main office line.
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