物理化学学报 >> 2006, Vol. 22 >> Issue (12): 1435-1440.doi: 10.1016/S1872-1508(06)60073-9

研究论文    下一篇

2,5-双取代烷基苯磺酸钠胶束微结构的1H NMR研究

袁汉珍;王琳;程功臻;赵濉;毛诗珍;俞稼镛;杜有如   

  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; 中国科学院理化技术研究所, 北京 100080; 武汉大学化学与分子科学学院, 武汉 430072)
  • 收稿日期:2006-04-18 修回日期:2006-06-15 发布日期:2006-12-06
  • 通讯作者: 杜有如 E-mail:lfshen@wipm.ac.cn

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

YUAN Han-Zhen;WANG Lin;CHENG Gong-Zhen;ZHAO Sui;MAO Shi-Zhen;YU Jia-Yong;DU You-Ru   

  1. (State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China; Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China; College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China)
  • Received:2006-04-18 Revised:2006-06-15 Published:2006-12-06
  • Contact: DU You-Ru E-mail:lfshen@wipm.ac.cn

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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 enhancement spectroscopy)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.

关键词: 双取代烷基苯磺酸盐, 胶束结构, 1H NMR, 弛豫, 2D NOESY

Abstract: Micellization of a series of newly synthesized dialkyl 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 alkyl chains with varying lengths, and the m-substituted ones are branched alkyl 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 alkyl chains of the dialkyl benzene sulfonates were less tightly packed than the o-substituted normal alkyl chains in the hydrophobic micellar cores. The shorter the m-substituted branched alkyl chains, the looser they were packed in the hydrophobic micellar core. The relative arrangement of the surfactant molecules in the micelles was elucidated.

Key words: Dialkyl benzene sulfonates, Micellar structure, 1H NMR, Relaxation, 2D NOESY