HETERONUCLEAR OVERHAUSER EFFECT MEASUREMENTS IN SURFACTANT SYSTEMS .2. EVIDENCE OF SOLVENT PENETRATION INTO MICELLES IN A NONAQUEOUS MEDIUM

被引：19

作者：

BELMAJDOUB, A ^{[1
]}

MAHIEU, N ^{[1
]}

TEKELY, P ^{[1
]}

CANET, D ^{[1
]}

机构：

[1] UNIV NANCY 1,METHODOL RMN GRP,CNRS,UA 406,LESOC,BP 239,F-54506 VANDOEUVRE NANCY,FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 03期

关键词：

D O I：

10.1021/j100182a001

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 heteronuclear Overhauser effect between protons of formamide (FA) and carbon-13 of cetyltrimethylammonium bromide has been investigated in temperature and surfactant concentration conditions where the surfactant forms micelles in this nonaqueous solvent. Unexpectedly, responses from carbons of the surfactant tail are observed. These responses are of sign opposite to the conventional ones. These experimental observations are qualitatively explained and rationalized on the basis of spin diffusion amid the surfactant proton spin system, by taking into account the signs of the various cross-relaxation terms involved in the transmission of nuclear Overhauser processes. This is a clear demonstration of solvent penetration into micelles formed in a nonaqueous medium.

引用

页码：1011 / 1013

页数：3

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