2,5-双取代烷基苯磺酸钠胶束微结构的~1H NMR研究(英文)  

Microstructures of 2,5-dialkyl Benzene Sulfonate Micelles Studied Using ~1H NMR

作　　者：袁汉珍[1] 王琳[2] 程功臻[3] 赵濉[2] 毛诗珍[1] 俞稼镛[2] 杜有如[1] 

机构地区：[1]中国科学院武汉物理与数学研究所,波谱与原子分子国家重点实验室,武汉430071 [2]中国科学院理化技术研究所,北京100080 [3]武汉大学化学与分子科学学院,武汉430072

出　　处：《物理化学学报》2006年第12期1435-1440,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20373087)资助项目

摘　　要：利用核磁共振化学位移变化,自旋-自旋弛豫和2D NOESY(two-dimensional nuclear Overhauser enhancementspectroscopy)研究了一系列新合成的双取代烷基苯磺酸盐的胶束化.结果表明,邻位取代的是正烷烃链,间位取代的是支烷烃链.而且,邻位取代的烷烃链越长,参与形成胶束疏水核表面层的亚甲基个数越多.因此,每个分子在饱和吸附的油水界面上的面积越大.间位取代的分支链在胶束疏水核中堆积得没有邻位取代的正烷烃链紧密.分支链越短,堆积得越不紧密.描述了胶束中分子的相对排列.Micellization of a series of newly synthesized diaikyl benzene sulfonates was studied using proton chemical shift changes, spin-lattice, and spin-spin relaxation NMR spectroscopy, and two-dimensional nuclear Overhauser enhancement spectroscopy （2D NOESY）. The o-substituted chains are normal aikyl chains with varying lengths, and the m-substituted ones are branched aikyl chains. The results showed that the longer the o-substituted normal alkyl chain, protons of more methylene groups participated in the formation of the rigid surface layer of the hydrophobic micellar core. Consequently, the larger was the area per molecule adsorbed on the interface between oil and water at saturation. The branched m-substituted aikyl chains of the diaikTl benzene sulfonates were less tightly packed than the o-substituted normai aikyl chains in the hydrophobic micellar cores. The shorter the m-substituted branched aikyl chains, the looser they were packed in the hydrophobic micellar core. The relative arrangement of the surfactant molecules in the micelles was elucidated.

关 键 词：双取代烷基苯磺酸盐 胶束结构 ^1H NMR 弛豫 2D NOESY 

分 类 号：O648.1[理学—物理化学]