NMR-STUDY OF SOLID LACTIC-ACID (2-HYDROXYPROPANOIC ACID)

被引：3
|
作者：
BUSZKO, ML [1 ]
ANDREW, ER [1 ]
机构：
[1] UNIV FLORIDA,DEPT RADIOL,GAINESVILLE,FL 32611
来源：
MOLECULAR PHYSICS | 1992年 / 76卷 / 01期
基金：
美国国家卫生研究院;
关键词：
D O I：
10.1080/00268979200101171
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：
Polycrystalline L-lactic acid ((S)-2-hydroxypropanoic acid) has been investigated by pulsed proton magnetic resonance methods between 77 K and the melting point, 329 K, at 14 and 25 MHz. A reduction of dipolar second moment is ascribed to methyl group reorientation. This motion is also responsible for spin-lattice relaxation; its correlation time is characterized by an activation energy 12.2 +/- 1 kJ mol-1 and time factor (3.5 +/- 1) x 10(-13) s. Below 100 K quantum-mechanical tunnelling contributes to reduction of the second moment and to spin-lattice relaxation, characterized by an excitation energy 6.2 +/- 1 kJ mol-1.
引用
收藏
页码：83 / 87
页数：5
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