11-Mercaptoundecylphosphonic acid
11-Mercaptoundecylphosphonic acid (CAS: 156125-36-9, C11H25O3PS) is a versatile chemical compound featuring both a thiol and a phosphonic acid group. This dual functionality allows it to form self-assembled monolayers on metal oxide surfaces while also enabling click-type chemistry with alkenes or metal binding. Its unique properties make it valuable in materials science, particularly for surface modification and nanotechnology applications.
- IUPAC
- 1-Thio-11-undecanephosphonic acid
- Synonyms
- 1-Thio-11-undecanephosphonic acid

Surface Modification
Utilised for creating self-assembled monolayers (SAMs) on metal oxide substrates due to the phosphonic acid group's strong affinity for these surfaces. The terminal thiol group offers further functionalization possibilities.
Nanotechnology and Microelectronics
Its ability to form ordered molecular layers makes it suitable for applications in nanoelectronics and for modifying the surfaces of nanoparticles and other micro/nanoscale devices.
Bioconjugation and Click Chemistry
The reactive thiol moiety can participate in click-type reactions with alkenes or bind to metal ions, facilitating the conjugation of molecules or the creation of functionalised materials.
Materials Science Research
Serves as a key building block in advanced materials science for developing novel coatings, functional surfaces, and hybrid organic-inorganic materials.
| Molecular weight | 268.35 |
|---|---|
| Empirical formula | C11H25O3PS |
| Assay | 97% |
| Storage temperature | 2-8°C |
| Application | Phosphonic acid that can be used to form self-assembled monolayers onto metal oxide surfaces. Also contains a thiol group that can be used to do click-type chemistry with alkenes or can bind metals. |
| Melting point | 80-90 °C |

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
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26 |
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 11-Mercaptoundecylphosphonic acid used for?
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11-Mercaptoundecylphosphonic acid is primarily used for forming self-assembled monolayers on metal oxide surfaces and for applications requiring its terminal thiol group, such as click-type chemistry or metal binding, making it suitable for materials science and nanotechnology.
What are the CAS number and formula for 11-Mercaptoundecylphosphonic acid?
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The CAS number is 156125-36-9 and the empirical formula is C11H25O3PS.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 11-Mercaptoundecylphosphonic acid with a purity of 97%. This product is supplied for research and development purposes and is not represented as USP, BP, EP, or any other pharmacopoeia grade.
How should 11-Mercaptoundecylphosphonic acid be handled?
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According to GHS classifications, 11-Mercaptoundecylphosphonic acid may cause skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Handle with appropriate personal protective equipment, ensuring good ventilation, and avoid contact with skin, eyes, and clothing. Store at 2-8°C.
Is 11-Mercaptoundecylphosphonic acid available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 11-Mercaptoundecylphosphonic acid.
How can I request a sample or quote for 11-Mercaptoundecylphosphonic acid?
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To request a sample or obtain a quotation, please contact our sales team through the website or by phone, providing your specific requirements and delivery details.
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