4-Oxo-TEMPO
4-Oxo-TEMPO (CAS 2896-70-0, C9H16NO2) is a stable nitroxide free radical with a molecular weight of 170.23 g/mol. This versatile compound serves as a redox source in lithium secondary batteries and is widely employed in free-radical biological studies, radical spin-trapping, and electron paramagnetic resonance (EPR) spectroscopy. It also finds application in polymer chemistry and synthesis.
- IUPAC
- 4-Oxo-2,2,6,6-tetramethyl-1-piperidinyloxy, free radical

Lithium Secondary Batteries
4-Oxo-TEMPO functions as a redox-active material for anodes in advanced lithium secondary battery systems, contributing to electrochemical energy storage solutions.
Free-Radical Biological Studies
This nitroxide radical is a valuable tool for investigating free-radical processes within biological systems, aiding in the understanding of cellular mechanisms.
Electron Paramagnetic Resonance (EPR)
As a spin probe, 4-Oxo-TEMPO is extensively used in EPR spectroscopy for studying molecular dynamics, reaction mechanisms, and material properties.
Radical Spin-Trapping
The compound's radical nature makes it effective for trapping transient free radicals, enabling their detection and characterization in various chemical processes.
Polymer Chemistry
4-Oxo-TEMPO is utilised in polymer synthesis and characterization, particularly in controlled radical polymerization techniques.
| Molecular weight | 170.23 |
|---|---|
| Empirical formula | C9H16NO2 |
| Storage temperature | 2-8°C |
| Application | Free-radical nitroxide spin probe typically used for:• Redox sources for anodes in lithium secondary batteries1• Free-radical biological studies2• Radical spin-trapping3• Electron paramagnetic resonance studies4• Polymer chemisty and synthesis applications5 |

Hazard statements
- H400Very toxic to aquatic life
Precautionary statements
- P273Avoid release to the environment
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
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-Oxo-TEMPO used for?
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4-Oxo-TEMPO is used as a redox source for anodes in lithium secondary batteries, in free-radical biological studies, for radical spin-trapping, in electron paramagnetic resonance (EPR) spectroscopy, and in polymer chemistry and synthesis.
What is the CAS number and formula for 4-Oxo-TEMPO?
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The CAS number is 2896-70-0 and the empirical formula (Hill notation) is C9H16NO2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Oxo-TEMPO. The specific assay and purity are available on the product's Certificate of Analysis. This product is not intended for USP, BP, EP, or pharmaceutical use unless explicitly stated otherwise.
How should 4-Oxo-TEMPO be handled safely?
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4-Oxo-TEMPO is classified as very toxic to aquatic life (H400). Handle with appropriate personal protective equipment, including eyeshields and gloves. Ensure adequate ventilation and use a P1 (EN143) or N95 respirator filter if necessary. Avoid release to the environment (P273).
How is 4-Oxo-TEMPO shipped and exported?
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4-Oxo-TEMPO is shipped and exported according to international regulations for hazardous materials, identified as UN 3077, Class 9, Packing Group III.
How can I request a quote or sample for 4-Oxo-TEMPO?
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To request a quote or a sample of 4-Oxo-TEMPO, please contact our sales team directly through our website or by phone.
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