Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (06): 691-695.doi: 10.1016/S1872-1508(06)60028-4

• ARTICLE • Previous Articles     Next Articles

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

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