1H NMR relaxation in urea

被引：10
|
作者：
Taylor, R. E. [1 ]
Bacher, Alfred D.
Dybowski, C.
机构：
[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[2] Univ Delaware, Dept Chem & Biochem, Newark, DE 19761 USA
来源：
JOURNAL OF MOLECULAR STRUCTURE | 2007年 / 846卷 / 1-3期
基金：
美国国家科学基金会;
关键词：
NMR; H-1; C-13; CP/MAS; N-15; spin-lattice relaxation; T-1; rho; activation energy; urea;
D O I：
10.1016/j.molstruc.2007.01.043
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：
Proton NMR spin-lattice relaxation times T-1 were measured for urea as a function of temperature. An activation energy of 46.3 +/- 4.7 kJ/mol was extracted and compared with the range of 38-65 kJ/mol previously reported in the literature as measured by different magnetic resonance techniques. In addition, proton NMR spin-lattice relaxation times in the rotating frame T-1 rho were measured as a function of temperature. These measurements provide acquisition conditions for the C-13 and N-15 CP/MAS spectra of pure urea in the crystalline phase. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：147 / 152
页数：6
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