1-Pentanethiol
1-Pentanethiol (CAS: 110-66-7), with the molecular formula CH3(CH2)4SH and a molecular weight of 104.21 g/mol, is an alkyl thiol. It is characterised by its distinctive odour. This compound finds applications in materials science, particularly within micro/nanoelectronics and self-assembly processes, serving as a precursor for fabricating ordered molecular layers and functionalised surfaces.
- IUPAC
- Amyl mercaptan,Mercaptan C5,PT,Pentyl mercaptan

Materials Science
1-Pentanethiol is employed in materials science for its ability to form self-assembled monolayers (SAMs) on various surfaces. These SAMs can modify surface properties, enabling applications in microelectronics and nanotechnology.
Micro/Nanoelectronics
In micro and nanoelectronics, this thiol serves as a building block for creating functionalised surfaces and interfaces. Its controlled adsorption allows for precise patterning and modification of electronic components.
Self-Assembly
The compound is utilised in self-assembly processes to create ordered molecular structures. This capability is crucial for developing advanced materials with tailored functionalities and for applications in contact printing techniques.
| Molecular weight | 104.21 |
|---|---|
| Linear formula | CH3(CH2)4SH |
| Assay | 98% |
| Boiling point | 126 °C(lit.) |
| Density | 0.84 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.446(lit.) |
| Vapour pressure | 27.4 mmHg (37.7 °C) |


Hazard statements
- H225Highly flammable liquid and vapour
- H302Harmful if swallowed
- H332Harmful if inhaled
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 18 °C / 64.4 °F |
| Transport (UN / ADR) | UN 1111 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xn |
| Risk statements (R) | 11-20/22 |
| Safety statements (S) | 16-23-24/25 |
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 1-Pentanethiol used for?
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1-Pentanethiol is used in materials science, micro/nanoelectronics, and self-assembly processes. It is valuable for creating self-assembled monolayers (SAMs) and functionalising surfaces.
What are the CAS number and chemical formula for 1-Pentanethiol?
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The CAS number for 1-Pentanethiol is 110-66-7, and its chemical formula is CH3(CH2)4SH.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1-Pentanethiol with an assay of 98%. This is typically considered a technical or research grade, and TSS does not represent it as USP, BP, or EP grade.
How should 1-Pentanethiol be handled safely?
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1-Pentanethiol is a flammable liquid and vapour (H225) and is harmful if swallowed (H302) or inhaled (H332). Handling requires appropriate personal protective equipment, including eyeshields, gloves, and suitable respiratory protection, in a well-ventilated area away from ignition sources. Follow all precautionary statements, such as P210 (keep away from heat/sparks/open flames/hot surfaces. - No smoking).
Is 1-Pentanethiol a controlled substance?
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The provided data does not indicate that 1-Pentanethiol is a controlled substance.
How is 1-Pentanethiol packed and shipped?
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1-Pentanethiol is packed and shipped according to its classification as a flammable liquid (UN 1111, Class 3, PG II). Please contact TSS for specific shipping and export details.
How can I request a sample or quote for 1-Pentanethiol?
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To request a sample or quote for 1-Pentanethiol, please contact Tech Serve Solutions directly through our website or sales representatives.
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