11-Hydroxyundecylphosphonic acid
11-Hydroxyundecylphosphonic acid (CAS: 83905-98-0, Formula: C11H25O4P) is an organophosphonate surface modifier with a molecular weight of 252.29 g/mol. This compound is primarily utilised for creating self-assembled monolayers (SAMs) on various surfaces. Its unique structure allows for covalent binding of amine groups, making it valuable in label-free biosensing and micro/nanoelectronics applications.
- IUPAC
- P-(11-Hydroxyundecyl)phosphonic acid
- Synonyms
- P-(11-Hydroxyundecyl)phosphonic acid

Surface Modification
Utilised as an organophosphonate surface modifier to create robust self-assembled monolayers (SAMs). The hydroxyalkylphosphonate group facilitates strong surface attachment.
Biosensing
Serves as a key component in label-free and cost-effective biosensing platforms. It enables the covalent immobilisation of biomolecules, facilitating detection.
Micro/Nanoelectronics
Applied in the field of micro/nanoelectronics for precise surface functionalisation. It enables controlled modification of surfaces at the nanoscale.
Protein Immobilisation
Functions as a hydroxyalkylphosphonate monolayer that covalently binds primary amine groups present in protein domains via chloroformate-derived crosslinking.
| Molecular weight | 252.29 |
|---|---|
| Empirical formula | C11H25O4P |
| Assay | ≥95% (GC) |
| Application | An organophosphonate surface modifier for label-free and low-cost biosensing applications;Organophosphonic acid self-assembled monolayers (SAMs);A hydroxyalkylphosphonate monolayer used to covalently bind primary amine groups in protein domains using chloroformate-derived crosslinking |
| Melting point | 107-111 °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-Hydroxyundecylphosphonic acid used for?
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11-Hydroxyundecylphosphonic acid is used as an organophosphonate surface modifier for creating self-assembled monolayers (SAMs), in label-free biosensing, micro/nanoelectronics, and for covalently binding primary amine groups in protein domains.
What are the CAS number and chemical formula for 11-Hydroxyundecylphosphonic acid?
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The CAS number is 83905-98-0 and the chemical formula is C11H25O4P.
What grade and purity does Tech Serve Solutions supply for 11-Hydroxyundecylphosphonic acid?
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Tech Serve Solutions supplies 11-Hydroxyundecylphosphonic acid with a purity of ≥95% (GC). This product is not represented as USP, BP, EP, or other pharmacopoeia grades.
How should 11-Hydroxyundecylphosphonic acid be handled safely?
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11-Hydroxyundecylphosphonic acid is classified as a Warning. It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Ensure adequate ventilation and wear appropriate protective gear, including gloves, eye protection, and respiratory protection if needed. Avoid breathing dust/fume/gas/mist/vapours/spray. In case of contact with eyes, rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
Is 11-Hydroxyundecylphosphonic acid available for export?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including 11-Hydroxyundecylphosphonic acid.
How can I request a sample or quote for 11-Hydroxyundecylphosphonic acid?
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Please contact our sales team via the website or telephone to request a sample or a quotation for 11-Hydroxyundecylphosphonic acid.
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