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用1H NMR弛豫、2D NOESY研究了双子表面活性剂14-s-14胶束在重水溶液中的聚集行为.1H NMR自旋-晶格、自旋-自旋弛豫实验表明,联结基团质子及其邻近的亚甲基质子的运动受到严重限制,表明这些质子形成胶束疏水核的壳层;而远离极性头的疏水质子的运动则相对自由,说明其位于胶束的内部.14-s-14系列(s=2,3,4)的弛豫实验结果还表明,联结基团越短,分子的碳氢链在疏水核中的排列越紧密.与14-4-14的对应单链表面活性剂TTAB相比,它们的分子运动更受限制.14-4-14的2D NOESY谱给出了与16-4-16类似的交叉峰信息,这表明14-4-14同16-4-16一样,形成了表面不平滑的球形胶束.因此,烷烃链的长短对胶束中分子的排列方式没有影响.
1H NMR relaxation and 2D NOESY were used to investigate the aggregation behavior of gemini surfactant 14-s-14 micelles in aqueous solution. The 1H NMR spin-lattice and spin-spin relaxation experiments show that the coupling groups The movement of protons and their neighboring methylene protons is severely restricted, indicating that these protons form the shell of the micelle hydrophobic core; whereas the hydrophobic protons away from the polar head are relatively free of motion, indicating that they are inside the micelles.14 The relaxation experiment of -s-14 series (s = 2, 3, 4) also showed that the shorter the linking group, the closer the molecular hydrogen chains are arranged in the hydrophobic core. Corresponding to 14-4-14 Their molecular motions are more limited than the single-chain surfactant TTAB.The 2D NOESY spectrum of 14-4-14 gives cross-peak information similar to 16-4-16, indicating that 14-4-14 is the same as 16 -4-16, the spherical micelles with non-smooth surfaces are formed, so the length of the alkane chains has no effect on the arrangement of the molecules in the micelles.