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

被引：14
|
作者：
Li, Yongjun [1 ]
Lei, Xuegong [1 ]
Li, Xia [1 ]
Lawler, Ronald G. [2 ]
Murata, Yasujiro [3 ]
Komatsu, Koichi [4 ]
Turro, Nicholas J. [1 ]
机构：
[1] Columbia Univ, Dept Chem, New York, NY 10027 USA
[2] Brown Univ, Dept Chem, Providence, RI 02912 USA
[3] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan
[4] Fukui Univ Technol, Dept Environm & Biol Chem, Fukui 9108505, Japan
来源：
CHEMICAL COMMUNICATIONS | 2011年 / 47卷 / 46期
基金：
美国国家科学基金会;
关键词：
POLARIZATION; REDUCTION; RESONANCE; RADICALS; EPR;
D O I：
10.1039/c1cc15149e
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
H-1 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.
引用
收藏
页码：12527 / 12529
页数：3
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