4-Oxo-2,2,6,6-tetramethylpiperidinooxy
4-Oxo-2,2,6,6-tetramethylpiperidinooxy structure
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Common Name | 4-Oxo-2,2,6,6-tetramethylpiperidinooxy | ||
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| CAS Number | 2896-70-0 | Molecular Weight | 170.229 | |
| Density | 1.02g/cm3 | Boiling Point | 257.5ºC at 760mmHg | |
| Molecular Formula | C9H16NO2 | Melting Point | 33-38 °C | |
| MSDS | Chinese USA | Flash Point | 109.5ºC | |
| Symbol |
GHS09 |
Signal Word | Warning | |
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Electron paramagnetic resonance line shifts and line shape changes due to heisenberg spin exchange and dipole-dipole interactions of nitroxide free radicals in liquids 8. Further experimental and theoretical efforts to separate the effects of the two interactions.
J. Phys. Chem. A 116(11) , 2855-66, (2012) The work in part 6 of this series (J. Phys. Chem. A 2009, 113, 4930), addressing the task of separating the effects of Heisenberg spin exchange (HSE) and dipole-dipole interactions (DD) on electron paramagnetic resonance (EPR) spectra of nitroxide spin probes... |
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A novel analytical method to evaluate directly catalase activity of microorganisms and mammalian cells by ESR oximetry.
Free Radic. Res. 44(9) , 1036-43, (2010) Electron spin resonance (ESR) oximetry technique was applied for analysis of catalase activity in the present study. Catalase activity was evaluated by measuring oxygen from the reaction between hydrogen peroxide (H(2)O(2)) and catalase-positive cells. It was... |
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Neurotoxicity of reactive aldehydes: the concept of "aldehyde load" as demonstrated by neuroprotection with hydroxylamines.
Brain Res. 1095(1) , 190-9, (2006) The concept of "oxidative stress" has become a mainstay in the field of neurodegeneration but has failed to differentiate critical events from epiphenomena and sequalae. Furthermore, the translation of current concepts of neurodegenerative mechanisms into eff... |
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Nitroxide spin exchange due to re-encounter collisions in a series of n-alkanes.
J. Chem. Phys. 129(6) , 064501, (2008) Bimolecular collisions between perdeuterated 2,2,6,6-tetramethyl-4-oxopiperidine-l-oxyl molecules in three alkanes have been studied by measuring the electron paramagnetic resonance (EPR) spectral changes induced by spin exchange. We define an "encounter" to ... |
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EPR line shifts and line shape changes due to spin exchange of nitroxide free radicals in liquids: 6. Separating line broadening due to spin exchange and dipolar interactions.
J. Phys. Chem. A 113(17) , 4930-40, (2009) EPR spectra of perdeuterated 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl (PDT) are studied as functions of molar concentration, c, and temperature, T, in water and 70 wt % glycerol in water. The increase of the intrinsic line width averaged over the three hype... |
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Frequency dependence of electron spin relaxation times in aqueous solution for a nitronyl nitroxide radical and perdeuterated-tempone between 250 MHz and 34 GHz.
J. Magn. Reson. 225 , 52-7, (2012) Electron spin relaxation times of perdeuterated tempone (PDT) 1 and of a nitronyl nitroxide (2-(4-carboxy-phenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl) 2 in aqueous solution at room temperature were measured by 2-pulse electron spin echo (T(2)) or 3-... |
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EPR line shifts and line shape changes due to spin exchange of nitroxide-free radicals in liquids 4. Test of a method to measure re-encounter rates in liquids employing 15N and 14N nitroxide spin probes.
J. Phys. Chem. A 112(11) , 2177-81, (2008) EPR line shifts due to spin exchange of perdeuterated 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl (14N-PDT) in aqueous solutions and the same probe isotopically substituted with 15N (15N-PDT) were measured from 293 to 338 and 287 to 353 K, respectively. Nonlin... |
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Photo-excitation of carotenoids causes cytotoxicity via singlet oxygen production.
Biochem. Biophys. Res. Commun. 417(1) , 640-5, (2012) Carotenoids, natural pigments widely distributed in algae and plants, have a conjugated double bond system. Their excitation energies are correlated with conjugation length. We hypothesized that carotenoids whose energy states are above the singlet excited st... |
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Formation of TEMPOL-hydroxylamine during reaction between TEMPOL and hydroxyl radical: HPLC/ECD study.
Free Radic. Res. 42(5) , 505-12, (2008) Nitroxyl radicals are important antioxidants that have been used to protect animal tissues from oxidative damage. Their reaction with hydroxyl radical ((*)OH) is generally accepted to be the mechanism of antioxidant function. However, the direct interaction o... |
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A paramagnetic molecular voltmeter.
J. Magn. Reson. 190(1) , 7-25, (2008) We have developed a general electron paramagnetic resonance (EPR) method to measure electrostatic potential at spin labels on proteins to millivolt accuracy. Electrostatic potential is fundamental to energy-transducing proteins like myosin, because molecular ... |