179485

4-Oxo-TEMPO

• Synonym(s): 4-Oxo-2,2,6,6-tetramethyl-1-piperidinyloxy, free radical
• Empirical Formula (Hill Notation): C₉H₁₆NO₂
• CAS Number: 2896-70-0
• Molecular Weight: 170.23
• EC Number: 220-778-7
• MDL number: MFCD00006187
• UNSPSC Code: 12352000
• PubChem Substance ID: 24850816
• NACRES: NA.22

Properties

• form: solid
• Quality Level: 100
• functional group: ketone
• storage temp.: 2-8°C
• SMILES string: CC1(C)CC(=O)CC(C)(C)N1[O]
• InChI: 1S/C9H16NO2/c1-8(2)5-7(11)6-9(3,4)10(8)12/h5-6H2,1-4H3
• InChI key: WSGDRFHJFJRSFY-UHFFFAOYSA-N

Description

General description

4-Oxo-TEMPO is formed by the reaction of 2,2,6,6-tetramethyl-4-piperidone (4-oxo-TMP) and ¹O₂. It is a stable paramagnetic product formed during the irradiation of TiO₂ in aqueous suspensions.

Application

4-Oxo-TEMPO was employed as nitroxide standard to investigate the generation of singlet oxygen by photoexcited TiO₂ in ethanol by ESR spectroscopy. It may be employed as free radical polarizing agent in dynamic nuclear polarization (DNP) studies.

Free-radical nitroxide spin probe typically used for:

• Redox sources for anodes in lithium secondary batteries
• Free-radical biological studies
• Radical spin-trapping
• Electron paramagnetic resonance studies
• Polymer chemisty and synthesis applications

Safety Information

• pictograms: GHS09
• signalword: Warning
• hcodes: H400
• pcodes: P273
• Hazard Classifications: Aquatic Acute 1
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Eyeshields, Gloves, type N95 (US)