化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1358-1364. 上一篇    下一篇

研究论文

芳香反离子与离子表面活性剂胶团的相互作用

毛敏;黄建滨;肖进新;何煦;朱步瑶   

  1. 北京大学物理化学研究所.北京(100871)
  • 出版日期:2000-11-15 发布日期:2000-11-15

The interaction between the aromatic organic counterion and ionic surfactant micelle

Mao Min;Huang Jianbin;Xiao Jinxin;He Xu;Zhu Buyao   

  1. Beijing Univ, Inst Phys Chem.Beijing(100871)
  • Online:2000-11-15 Published:2000-11-15

用紫外吸收光谱的方法研究了多种芳香反离子与离子表面活性剂胶团之间的相互作用。发现阳离子表面活性剂和阴离子表面活性剂胶团对芳香反离子的吸收光谱有着显著不同的影响,芳香反离子结构的细微变化可导致光谱特性显著不同。这被解释为阳离子表面活性剂胶团与芳香环之间的阳离子-π相互作用。阳离子-π相互作用需要阳离子表面活性剂分子与芳香反离子具有合适的相对位置与距离。通过测定各混合体系的吸附量证明,不同的芳香反离子在胶团表面有不同的排列方式。NMR的实验结果支持了上述解释。

关键词: 表面活性剂, 胶团, 十二烷基硫酸钠, 溴化十六烷基三甲铵, 相互作用, 苯甲酸P, 邻苯二甲酸氢钾, 紫外分光光度法

The UV absorbance of various aromatic organic counterions has been investigated in the presence of ionic surfactant micelle. Addition of the cationic surfactant micelle to aqueous solutions of the aromatic organic salts induces a red shift of the adsorption spectra. It is proposed that the red shift is caused by cation-π interaction, which requires proper situation and distance between the surfactant's headgroup and the aromatic organic counterion. By measuring the adsorption of the surfactant and the aromatic organic counterions, it is discovered that different aromatic organic counterions adopt different configurations. This explanation is consistent with the NMR results.

Key words: SURFACTANTS, LAURYL SODIUM SULFATE, INTERACTIONS, BENZENECARBOXYLIC ACID P, POTASSIUM BIPHTHALATE, ULTRAVIOLET SPECTROPHOTOMETRY

中图分类号: