19F NMR and EPR study of fluorinated buckminsterfullerene C60F58

被引：6
|
作者：
Panich, AM
Shames, AI
Selig, H
机构：
[1] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
[2] Hebrew Univ Jerusalem, Dept Inorgan & Analyt Chem, IL-91904 Jerusalem, Israel
来源：
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2002年 / 63卷 / 03期
关键词：
fullerenes; electron paramagnetic resonance (EPR); nuclear magnetic resonance (NMR);
D O I：
10.1016/S0022-3697(01)00185-8
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Solid state F-19 NMR in the temperature range from 96 to 366 K and room temperature EPR studies of fluorinated buckminsterfullerene C60F58 have been carried out. The temperature dependence of the line width and the spin-lattice relaxation time show hindered molecular motion with the activation energy of DeltaE(a) = 1.9 kcal/mol. Neither phase transition nor random rotation of C60F58 have been obtained. The spin-lattice relaxation rate is strongly affected by the presence of paramagnetic centers, namely, dangling C-C bonds yielding localized Impaired electrons. Such broken bonds are caused by C-C bond rupture in a cage-opened structure of hyperfluorinated species. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：483 / 489
页数：7
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