A H-1 NMR study of molecular motions in chloropentamethylbenzene

被引：3
作者：
Ishikawa, A
Sasane, A
Nakashima, Y
Mori, Y
Sato, S
Kitazawa, C
机构：
[1] SHINSHU UNIV,FAC SCI,DEPT CHEM,MATSUMOTO,NAGANO 390,JAPAN
[2] GIFU UNIV,FAC ENGN,DEPT CHEM,GIFU 50111,JAPAN
[3] SHINSHU UNIV,SCH ALLIED MED SCI,MATSUMOTO,NAGANO 390,JAPAN
来源：
JOURNAL OF MOLECULAR STRUCTURE | 1997年 / 406卷 / 1-2期
关键词：
NMR spectroscopy; molecular motion; orientational disorder; dipolar interaction; chloropentamethylbenzene;
D O I：
10.1016/S0022-2860(96)09606-8
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：
The temperature dependence of the H-1 NMR spin-lattice relaxation time T-1 has been measured for solid chloropentamethylbenzene in the range 90-380 K. A single T-1 minimum of 36.5 ms was observed around 278 K at the Larmor frequency of 18 MHz and has been assigned to in-plane molecular reorientation about the pseudohexad C-6' axis over the nonequivalent potential wells. With the aid of the reported X-ray analyses, the results have been analysed by employing the method developed by Anderson. The activation energy has been evaluated as 27 kJ mol(-1) which amounts to nearly the same value as hexamethylbenzene. A gradual decrease of T-1 below 150 K was attributed to the methyl groups rotation about their C-3 axes over the barriers of 3.0 kJ mol(-1). (C) 1997 Elsevier Science B.V.
引用
收藏
页码：9 / 13
页数：5
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