Indirect ¹H NMR characterization of H₂@C₆₀ nitroxide derivatives and their nuclear spin relaxation

Li, Yongjun; Lei, Xuegong; Li, Xia; Lawler, Ronald G.; Murata, Yasujiro; Komatsu, Koichi; Turro, Nicholas J.

Indirect ¹H NMR characterization of H₂@C₆₀ nitroxide derivatives and their nuclear spin relaxation

2011

¹H 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. 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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