Results 181 to 190 of about 10,849 (224)
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Tuning the sensitivity of fluorophore–nitroxide radicals
Journal of Materials Chemistry, 2012The synthesis of pyrene–pyrazole nitronyl and imino nitroxides is reported, along with characterization of the radicals by UV-Vis, PL and EPR techniques. The UV-Vis studies revealed that the nature of the spacer attached to the nitroxide plays a crucial role in the radical n–π* transition intensity.
Borozdina, Y. +3 more
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Biological Relevance of Free Radicals and Nitroxides
Cell Biochemistry and Biophysics, 2016Nitroxides are stable, kinetically-persistent free radicals which have been successfully used in the study and intervention of oxidative stress, a critical issue pertaining to cellular health which results from an imbalance in the levels of damaging free radicals and redox-active species in the cellular environment.
Christopher Prescott, Steven E. Bottle
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Nitroxide radicals. Part XVII. Transannular interactions in [2.2]paracyclophanyl nitroxides
Journal of the Chemical Society, Perkin Transactions 1, 1975N.m.r. measurements on four [2.2]paracyclophanyl t-butyl nitroxides indicate that there is substantial interaction of the unpaired electron with the proton which is pseudo-gem to the nitroxide group. Pseudo-p-[2.2]paracyclophanylene bis-(t-butyl nitroxide) couples intramolecularly O-to-pseudo-gem-C, in solution to give mainly [2.2]paracyclophanequinone
Alexander R. Forrester, Rene Ramasseul
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Post‐polymerization modification by nitroxide radical coupling
Polymer International, 2018AbstractPost‐polymerization modification is an attractive approach to extend applications and convert commodity plastics into products with new, desirable and tunable properties. Among the post‐polymerization modification methods, the nitroxide radical coupling (NRC) reaction has been shown to be a convenient and versatile way to graft specific ...
S Coiai, E Passaglia, F Cicogna
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Nitroxide radicals and nitroxide-based high spin systems
2005The spectroscopic EPR data for nitroxides and polynitroxides published up to the year 2000 are reported.
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Nitroxides. IX. Synthesis of nitroxide free radical α-amino acids
Canadian Journal of Chemistry, 1982Three methods are described for preparation of a new stable nitroxide free radical amino acid, 2-amino-3-(1-oxyl-2,2,5,5-tetramethyl-3-pyrrolin-3-yl) propionic acid and its derivates. This amino acid may be used as a paramagnetic amino acid synthon in studies of peptides.
László Lex +2 more
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Nitroxide radicals. Part XI. Polymerisation of t-butyl vinylphenyl nitroxides
Journal of the Chemical Society C: Organic, 1971t-Butyl o-, m-, and p-vinylphenyl nitroxides, t-butyl p-(β- and α-phenylvinyl)phenyl nitroxides have been prepared. t-Butyl-p-vinylphenyl nitroxide and the two last-mentioned radicals on isolation polymerised rapidly and spontaneously by a route involving O to β-C coupling while the other two decomposed more slowly and were sufficiently stable to be ...
A. R. Forrester, S. P. Hepburn
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Electrospray mass spectrometry of stable iminyl nitroxide and nitronyl nitroxide free radicals
Journal of Mass Spectrometry, 2002AbstractElectrospray ionization (ESI) mass spectra have been recorded for a range of substituted nitronyl nitroxide and iminyl nitroxide monoradicals and biradicals. Secondary species formed in the ESI source were observed as the dominant ions in both the iminyl nitroxide and nitronyl nitroxide spectra.
Smith, Craig +2 more
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Persistence of Nitroxide Radicals in Solution
Applied Magnetic Resonance, 2019Data on long-term persistence of nitroxide radicals typically are focused on solid samples. Less information is available for nitroxides in fluid solution. Sealed deoxygenated solutions of a doxyl nitroxide in tetrahydrofuran and a piperidinyl nitroxide in toluene in 4 mm EPR tubes were kept in a laboratory environment at ambient temperature and ...
Hanan Elajaili +3 more
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