Nitroxide derivatives of acetylacetone as spin-labelled ligands
نویسندگان
چکیده
منابع مشابه
A nitroxide-maleimide spin label.
was chemically bonded to poly-L-lysine and to bovine serum albumin (BSA) and showed a paramagnetic resonance spectrum that was sensitive to known structural changes in these molecules, such as those produced by changes in pH.2 This nitroxide-isocyanate is unfortunately not an ideal spin-labeling reagent since it is unstable and thus difficult to purify, and moreover the isocyanate group is rapi...
متن کاملIndirect 1H NMR characterization of H2@C60 nitroxide derivatives and their nuclear spin relaxation.
(1)H NMR of two H(2)@C(60) nitroxide derivatives has been characterized indirectly by reducing to their corresponding hydroxylamines. Nuclear spin relaxation of the endohedral H(2) and external protons of the H(2)@C(60) nitroxide and its corresponding hydroxylamine were measured and analyzed. The observed spectra are consistent with negligible scalar coupling between the unpaired electron and t...
متن کاملNMR characterization of H2@C60 nitroxide derivatives and their nuclear spin relaxationw
H NMR of two H2@C60 nitroxide derivatives has been characterized indirectly by reducing to their corresponding hydroxylamines. Nuclear spin relaxation of the endohedral H2 and external protons of the H2@C60 nitroxide and its corresponding hydroxylamine were measured and analyzed. The observed spectra are consistent with negligible scalar coupling between the unpaired electron and the endo-H2. A...
متن کاملSynthesis, isomer count, and nuclear spin relaxation of H2O@open-C60 nitroxide derivatives.
H(2)O@C(60) derivatives covalently linked to a nitroxide radical were synthesized. The (1)H NMR of the guest H(2)O revealed the formation of many isomers with broad signals. Reduction to the diamagnetic hydroxylamines sharpened the (1)H NMR signals considerably and allowed for an "isomer count" based on the number of observed distinct signals. For H(2)O@K-8, 17 positional isomeric nitroxides ar...
متن کاملInteraction of nitroxide spin labels with chloroplasts.
Chloroplasts isolated from oats eliminated the electron spin resonance (ESR) signals from spin labels in white light and partially restored them in far-red light. Only the white light-mediated reaction was blocked by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). In contrast, oat (Avena sativa L. cv. Garry and Park) leaf mesophyll protoplasts oxidized the spin labels in both white and far-red ...
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ژورنال
عنوان ژورنال: Canadian Journal of Chemistry
سال: 1981
ISSN: 0008-4042,1480-3291
DOI: 10.1139/v81-025