Dynamics in physisorbed monolayers of 5-alkoxy-isophthalic acid derivatives at the liquid/solid interface investigated by scanning tunneling microscopy

André Gesquière, Mohamed M. Abdel-Mottaleb, Steven De Feyter*, Frans C. De Schryver, Michel Sieffert, Klaus Müllen, Anna Calderone, Roberto Lazzaroni, Jean-Luc Bredas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Monolayers of isophthalic acid derivatives at the liquid/solid interface have been studied with scanning tunneling microscopy (STM). We have investigated the dynamics related to the phenomenon of solvent co-deposition, which was previously observed by our research group when using octan-1-ol or undecan-1-ol as solvents for 5-alkoxy-isophthalic acid derivatives. This solvent co-deposition has now been visualized in real-time (two frames per second) for the first time. Dynamics of individual molecules were investigated in mixtures of semi-fluorinated molecules with video-STM. The specific contrast arising from fluorine atoms in STM images allows us to use this functionality as a probe to analyze the data obtained for the mixtures under investigation. Upon imaging the same region of a monolayer for a period of time we observed that non-fluorinated molecules progressively substitute the fluorinated molecules. These findings illustrate the metastable equilibrium that exists at the liquid/solid interface, between the physisorbed molecules and the supernatant solution.

Original languageEnglish (US)
Pages (from-to)3739-3746
Number of pages8
JournalChemistry - A European Journal
Volume6
Issue number20
DOIs
StatePublished - Oct 16 2000

Keywords

  • Liquid/solid interface
  • Monolayers
  • Scanning probe microscopy
  • Self-assembly

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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