3-Carboxy-PROXYL
3-Carboxy-PROXYL (CAS 2154-68-9), with the molecular formula C9H16NO3 and a molecular weight of 186.23 g/mol, is a stable nitroxide radical. It functions as a spin-label, widely applied in biological and chemical research. Its applications include studying molecular migration, assessing the stability of biological materials like seeds and pollen, and as a component in electron spin resonance (ESR) probes.
- IUPAC
- 3-(Carboxy)-2,2,5,5-tetramethyl-1-pyrrolidinyloxy,3-Carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, free radical

Spin-Labeling Agent
Used as a spin-label to study molecular migration and the long-term stability of biological samples such as seeds and pollen, providing insights into their structural and dynamic properties.
Electron Spin Resonance (ESR) Probes
Covalently attached to biomolecules like oligonucleotides to create DNA probes sensitive to ESR. The acetoxymethyl ester derivative can cross the blood-brain barrier, enabling ESR-computed tomographic imaging.
Chemical Synthesis
Serves as a synthetic reagent in radical chemistry, offering a stable radical source for various chemical transformations and research purposes.
| Molecular weight | 186.23 |
|---|---|
| Empirical formula | C9H16NO3 |
| Assay | 98% |
| Storage temperature | 2-8°C |
| Application | Spin-label that has been used to study molecular migration and long-term stability of seeds and pollen. Has been covalently attached to oligonucleotides to prepare a DNA probe sensitive to electron spin resonance. The acetoxymethyl ester is an esterase-sensitive probe that crosses the blood-brain barrier for electron spin resonance-computed tomographic imaging. |
| Melting point | 200 °C (dec.)(lit.) |
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 3-Carboxy-PROXYL used for?
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3-Carboxy-PROXYL is primarily used as a spin-labeling agent in research for studying molecular migration and stability, and as a component in electron spin resonance (ESR) probes. It is also utilized in chemical synthesis, particularly within radical chemistry.
What is the CAS number and formula for 3-Carboxy-PROXYL?
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The CAS number for 3-Carboxy-PROXYL is 2154-68-9, and its molecular formula is C9H16NO3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Carboxy-PROXYL with an assay of 98%. This product is intended for research and laboratory use; TSS does not represent it as USP, BP, or EP grade.
What are the safety and handling considerations for 3-Carboxy-PROXYL?
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3-Carboxy-PROXYL (CAS 2154-68-9) is classified under WGK Germany 3, indicating it is hazardous to water. Appropriate personal protective equipment should be worn, and handling should occur in a well-ventilated area. Consult the Safety Data Sheet for detailed handling and disposal instructions.
How is 3-Carboxy-PROXYL shipped and exported?
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Tech Serve Solutions, a specialist global supplier and exporter, ensures that 3-Carboxy-PROXYL is packed and shipped according to international regulations for chemical transport. We cater to export requirements worldwide.
How can I request a sample or quote for 3-Carboxy-PROXYL?
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To request a sample or a quote for 3-Carboxy-PROXYL, please contact our sales team through the website or by calling our customer service. Our team will respond promptly to your inquiry.
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