EPR STUDY OF HINDERED INTERNAL-ROTATION IN ALKYL C-60 RADICALS

被引：51

作者：

KRUSIC, PJ ^{[1
]}

ROE, DC ^{[1
]}

JOHNSTON, E ^{[1
]}

MORTON, JR ^{[1
]}

PRESTON, KF ^{[1
]}

机构：

[1] NATL RES COUNCIL CANADA, STEACIE INST MOLEC SCI, OTTAWA K1A 0R6, ONTARIO, CANADA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 09期

关键词：

D O I：

10.1021/j100111a004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electron paramagnetic resonance (EPR) spectra of several simple monoalkyl radical adducts of C60, studied in solution over a broad temperature range, reveal substantial barriers to internal rotation about the bond connecting the alkyl substituent to the C60 framework. An analysis of the temperature-dependent shape of the spectrum of tert-butyl-C60 afforded an activation energy for internal rotation of 8.2 kcal/mol. Observation of temperature-dependent line-shape effects and comparisons of H-1 and C-13 hyperfine interactions indicate the existence of similar barriers for other alkyl adducts (except methyl), which adopt symmetric (e.g., isopropyl) or asymmetric (e.g., ethyl) equilibrium conformations.

引用

页码：1736 / 1738

页数：3

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