Molekula
4-Hydroxy tempo (4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy, free radical)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
4-Hydroxy TEMPO is a stable free radical used as a catalyst in oxidation reactions and as a spin label in electron paramagnetic resonance (EPR) studies. It is a key reagent in organic synthesis and materials science. CAS: 2226-96-2, Molecular Formula: C9H18NO2, Molecular Weight: 172.24 g/mol, Storage: 2 to 8 °C, Signal Word: Danger. Molekula supplies 4-Hydroxy TEMPO from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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100 g — £29.50 per pack ex VAT · £35.40 inc. VAT
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500 g — £116.90 per pack ex VAT · £140.28 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Orange crystal |
| Melting Point | >65 Deg C |
| Ash | <0.5% |
| Assay | >99% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 71.5 °C |
Source: PubChem CID 137994 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 73749999 |
| CAS Number | 2226-96-2 |
| EC Number | 218-760-9 |
| Molecular Formula | C9H18NO2 |
| Molecular Weight | 172.24 |
| Exact Mass | 172.1338 |
| SMILES | CC1(CC(CC(N1[O])(C)C)O)C |
| InChIKey | UZFMOKQJFYMBGY-UHFFFAOYSA-N |
| InChI | InChI=1S/C9H18NO2/c1-8(2)5-7(11)6-9(3,4)10(8)12/h7,11H,5-6H2,1-4H3 |
| PubChem CID | 137994 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29339997 |
| Tariff Code | 2933919000 |
Safety & GHS
-
Corrosive
GHS05
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H318 Causes serious eye damage
- H373 May cause damage to organs through prolonged or repeated exposure
- H412 Harmful to aquatic life with long lasting effects
- USH01 May form combustible dust concentrations in air
Precautionary statements
- P262 Do not get in eyes, on skin, or on clothing
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1-Piperidinyloxy, 4-hydroxy-2,2,6,6-tetramethyl-
- 2,2,6,6-Tetramethyl-4-hydroxypiperidinooxy
- 2,2,6,6-Tetramethyl-4-piperidinol 1-oxyl
- 2,2,6,6-Tetramethyl-4-piperidinol-N-oxyl
- 4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl
- 4-Oxypiperidol
- HyTEMPO
- Nitroxyl 2
- Tanol
- TMPN
Frequently asked questions
What is 4-Hydroxy TEMPO used for?
4-Hydroxy TEMPO is primarily used as a stable free radical in organic synthesis, particularly in oxidation reactions and as a radical scavenger in polymer chemistry.
What is the chemical formula and molecular weight of 4-Hydroxy TEMPO?
The formula is C9H18NO2 with a molecular weight of 172.24 g/mol.
How should 4-Hydroxy TEMPO be stored?
It should be stored at 2 to 8 °C in a cool, dark place to maintain stability and prevent decomposition.
What grade of 4-Hydroxy TEMPO does Molekula supply?
Molekula supplies 4-Hydroxy TEMPO in high-purity research grade, suitable for laboratory and industrial applications.
Can Molekula supply 4-Hydroxy TEMPO in bulk?
Yes, Molekula can supply 4-Hydroxy TEMPO in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with a purchase of 4-Hydroxy TEMPO?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS), compliant with regulatory standards.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.