物理化学学报 >> 2004, Vol. 20 >> Issue (05): 449-453.doi: 10.3866/PKU.WHXB20040501

研究论文    下一篇

2-烷基-苯并咪唑在硝酸银亚相上的Langmuir膜及LB膜

吴一天;刘鸣华   

  1. 中国科学院化学研究所分子科学中心, 北京 100080
  • 收稿日期:2003-10-07 修回日期:2003-12-03 发布日期:2004-05-15
  • 通讯作者: 刘鸣华 E-mail:liumh@iccas.ac.cn

Langmuir Films of 2-alkyl Benzimidazoles on Aqueous AgNO3 Subphase and the Layer Structures of the Transferred Films

Wu Yi-Tian;Liu Ming-Hua   

  1. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080
  • Received:2003-10-07 Revised:2003-12-03 Published:2004-05-15
  • Contact: Liu Ming-Hua E-mail:liumh@iccas.ac.cn

摘要: 对不同链长的2-烷基-苯并咪唑衍生物(BzCn,烷基链长从C5到C15)在硝酸银亚相上的成膜行为及形成的LB膜的结构进行了研究.表面压-面积曲线的结果表明,短链(C5~C9)的2-烷基-苯并咪唑可在银离子亚相上形成稳定的单分子膜,而长链(C13和C15)衍生物则形成多层膜.利用LB技术可将上述Langmuir膜转移到固体基板上形成LB膜,其吸收光谱的结果说明了苯并咪唑和银离子配位.利用AFM、XRD及FT-IR等技术研究了烷基链长对LB膜结构的影响.实验结果表明,除了BzC15,其余的衍生物都可形成规整的层状结构.短链衍生物的单层LB膜具有均一、平整的形貌;而对于BzC15,观察到多层结构.

关键词: LB膜, 苯并咪唑, 硝酸银, 层状结构

Abstract: The formation of stable Langmuir films on the aqueous AgNO3 subphase of 2-alkyl benzimidazoles (BzCn) with various chain lengths (from C5 to C15) and the layer structures of the transferred films were described. From the surface pressure-area isotherm, it has been found that the true monolayer could be formed for the short chain derivatives, while multilayer structures for the long ones. All of the Langmuir films could be transferred to solid substrate. The measurement of the UV spectra of the transferred LB films confirmed the coordination between benzimidazole group and Ag(I) ion in the Langmuir films. The effect of the length of alkyl chains on the structure of the transferred LB films was revealed by application of atomic force microscopy, FT-IR spectra and X-ray diffraction (XRD) measurement. It showed that except for BzC15, a regular layer structure was formed. Characterization of the morphology points to the formation of the neat LB film for the short derivatives and multilayer structure for BzC15.

Key words: LB films, Benzimidazole, AgNO3, Layer structure