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Indirect 1H NMR characterization of H2@C60 nitroxide derivatives and their nuclear spin relaxation
Yongjun Li1, Xuegong Lei, Xia Li
1Department of Chemistry, Columbia University, New York, NY 10027, USA.
Abstract:
(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.
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