Indirect 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 the endo-H(2). An unexpectedly large bimolecular relaxivity induced in the hydroxylamine by the corresponding nitroxide can be explained by rapid hydrogen atom transfer between the two species.
Department of Chemistry, Columbia University, New York, NY 10027, USA.
Yongjun
Y
Li
Xuegong
X
Lei
Xia
X
Li
Ronald G
RG
Lawler
Yasujiro
Y
Murata
Koichi
K
Komatsu
Nicholas J
NJ
Turro
D037741:Fullerenes / Q000737:chemistry*; D019811:Hydroxylamine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D009589:Nitrogen Oxides / Q000737:chemistry*; D010084:Oxidation-Reduction
D037741:Fullerenes; D009589:Nitrogen Oxides; D019811:Hydroxylamine; C039900:nitroxyl; C069837:fullerene C60