4-Oxo-TEMPO

2,2,6,6-Tetramethylpiperidin-1-oxyl (TEMPO) is a stable radical that will react with reactive oxygen species (ROS). This conversion, followed by ESR, provides an indirect way to monitor ROS production in biological systems. TEMPONE is the 4-oxo derivative of TEMPO. In addition to possible uses as a spin trap, this nitroxyl radical can be used in hydrogen transfer experiments and as a polarizing agent in dynamic nuclear polarization NMR spectroscopy. TEMPONE and other nitroxyl radicals have also been shown to reduce mean arterial pressure in spontaneously hypertensive rats when administered intravenously.

Pink Needles

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

A spin label for ESR studies

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.

Non flammable

[1] ADAM WU. Nitroxyl Radical Plus Hydroxylamine Pseudo Self-Exchange Reactions: Tunneling in Hydrogen Atom Transfer[J]. Journal of the American Chemical Society, 2009, 131 33: 11985-11997. DOI: 10.1021/ja904400d
[2] LUMATA L, MERRITT M, KHEMTONG C, et al. The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy[J]. RSC Advances, 2012, 33: 12812-12817. DOI: 10.1039/c2ra21853d
[3] KINJAL PATEL. Acute antihypertensive action of nitroxides in the spontaneously hypertensive rat.[J]. American journal of physiology. Regulatory, integrative and comparative physiology, 2006, 290 1: R37-43. DOI: 10.1152/ajpregu.00469.2005