物理化学学报 >> 2006, Vol. 22 >> Issue (06): 691-695.doi: 10.1016/S1872-1508(06)60028-4

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β-联碳酰基类衍生物有序自组装膜的STM研究

刁玉霞;Dirk Rohde;万立骏   

  1. 中国科学院化学研究所, 北京 100080
  • 收稿日期:2005-12-16 修回日期:2006-02-15 发布日期:2006-05-31
  • 通讯作者: 万立骏 E-mail:wanlijun@iccas.ac.cn

Ordered Self-assembled Monolayers of β-dicarbonyl Derivatives Studied by STM

DIAO Yu-Xia;ROHDE Dirk;WAN Li-Jun   

  1. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China
  • Received:2005-12-16 Revised:2006-02-15 Published:2006-05-31
  • Contact: WAN Li-Jun E-mail:wanlijun@iccas.ac.cn

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摘要： 在大气条件下, 利用扫描隧道显微镜研究了四个β-联碳酰基类衍生物在高定向裂解石墨(HOPG)表面的自组装结构. 研究分子的结构中均包含π电子共轭体系和烷基链. 实验研究了分子结构对自组装结构的影响, 并利用分子结构的变化实现了自组装膜结构的调控. 结果表明, 在甲苯溶剂中制备的这些自组装结构均长程有序, 分子间氢键和偶极相互作用是影响自组装膜结构变化的重要因素.

关键词: 扫描隧道显微镜, &beta, -联碳酰基类衍生物, 自组装单层膜, 高定向裂解石墨

Abstract: The adsorption of four β-dicarbonyl derivatives on highly oriented pyrolytic graphite (HOPG) surface was studied by scanning tunneling microscopy (STM) in an ambient environment. All the molecules include π-conjugated part and alkyl chains in their chemical structures. The molecules were dissolved in toluene and a drop of the solution was deposited on HOPG to form self-assembled adlayer. The characteristic stripe-like structure in the self-assembled monolayer (SAM) on the high-resolution STM images of the compounds was observed. Different molecular structures led to different SAMs. It was found that noncovalent interactions such as hydrogen bonds and dipole-dipole interactions played an important role in the formation of different SAMs.

Key words: Scanning tunneling microscopy, &beta, -dicarbonyl derivatives, Self-assembled monolayer, HOPG