NMR RELAXATION STUDIES OF INTERNAL MOTIONS - A COMPARISON BETWEEN MICELLES AND RELATED SYSTEMS

被引：40
|
作者：
BRATT, PJ
GILLIES, DG
SUTCLIFFE, LH
WILLIAMS, AJ
机构：
[1] UNIV LONDON ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT CHEM, EGHAM TW20 0EX, SURREY, ENGLAND
[2] UNIV LONDON, BEDFORD NEW COLL, EGHAM TW20 0EX, SURREY, ENGLAND
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1990年 / 94卷 / 07期
关键词：
D O I：
10.1021/j100370a001
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：
Multifrequency relaxation studies combined with the "two-step" model for molecular motion have shown striking similarities between correlation times for the fast motions at each of the last four carbons of aliphatic chains in surfactant and other systems. Determination of activation energies in nonsurfactant systems of 12 and 15 kJ mol-1 for the methyl and methylene groups, respectively, enabled correlation times for all data to be expressed at 298 K. The values for the correlation times are very similar, averages were 4.9, 11, 14, and 19 ps (starting with the methyl carbon), indicating similar molecular motions in micellar and nonmicellar systems. © 1990 American Chemical Society.
引用
收藏
页码：2727 / 2729
页数：3
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